CN110707362A - High-performance lithium battery and preparation method thereof - Google Patents
High-performance lithium battery and preparation method thereof Download PDFInfo
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- CN110707362A CN110707362A CN201910584737.5A CN201910584737A CN110707362A CN 110707362 A CN110707362 A CN 110707362A CN 201910584737 A CN201910584737 A CN 201910584737A CN 110707362 A CN110707362 A CN 110707362A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention discloses a preparation method of a high-performance lithium battery, which comprises the following steps: placing a thermal adhesion diaphragm between the positive and negative pole pieces, and manufacturing into a battery cell, wherein the thermal adhesion diaphragm is a diaphragm which has an adhesion effect on an electrode material at a preset temperature or pressure; preheating and/or flatly pressing the battery cell, wherein the preheating temperature is greater than or equal to the softening temperature of the hot adhesive material and is less than the melting temperature of the hot adhesive material; the pressure of the flat pressing treatment is greater than or equal to the yield limit of the hot viscous material; shaping the preheated and/or flat-pressed battery cell; and carrying out post-treatment on the shaped battery cell to obtain the lithium ion battery. Correspondingly, the invention also provides a lithium battery prepared by the method. The invention can reduce energy consumption, simplify process conditions, simplify equipment and simplify raw materials, and the battery has high appearance size consistency and stability and high performance consistency and stability.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a high-performance lithium battery and a preparation method thereof.
Background
The current manufacturing process of the power lithium battery comprises the following steps of pulping, coating, flaking, winding (laminating), shaping, packaging, injecting liquid, aging, forming at high temperature and high pressure, secondary packaging and capacity grading. The formation is the key for forming the SEI solid electrolyte membrane, directly influences the electrical performance and the safety performance of the lithium battery, and is the most critical process for the performance of the battery.
The existing chemical components can be divided into hot-pressing chemical components, high-temperature chemical components and high-pressure chemical components, and the interface impedance of a positive electrode, a negative electrode and a diaphragm is reduced through high-temperature and high-pressure external conditions and the like during the chemical components formation, so that the lithium ion permeability is improved, the formation of an SEI film is accelerated, the compactness of the SEI film is improved, and the performance of a lithium ion battery is improved. However, such processes have the following disadvantages:
1. the high-temperature heating needs a long time, and the energy consumption is high;
2. the equipment is complex and expensive, a clamp needs to be arranged in a matching way, the danger of manual operation is high, and the potential safety hazard is large;
3. the requirement on the electrolyte is high, and expensive high-temperature resistant electrolyte needs to be added;
4. the battery performance difference is big because under high pressure, heat from anchor clamps transfer to electric core outer terminal surface and then to the inlayer transfer, the gel layer of electric core outer diaphragm reaches the softening point than the inlayer foremost to take place deformation earlier. Therefore, the outer diaphragm of the battery core is longest in high-temperature radiation time and largest in deformation, the lithium ion trafficability characteristic is different due to the difference between the inner layer and the outer layer, the electrical performance of the inner layer and the outer layer of the battery core is inconsistent, and the difference between the battery cores cannot be accurately controlled.
Namely, the existing lithium battery manufacturing method cannot simultaneously solve the technical problems of high energy consumption, complex and expensive equipment, special and expensive electrolyte, stable battery performance and the like.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a preparation method of a high-performance lithium battery, which can simultaneously reduce energy consumption, simplify process conditions, simplify equipment and simplify raw materials, and has high consistency and stability of the appearance size and high performance consistency and stability.
The technical problem to be solved by the invention is to provide a high-performance lithium battery which is low in cost, high in consistency and stability of appearance and size and high in performance consistency and stability.
In order to achieve the technical effect, the invention provides a preparation method of a high-performance lithium battery, which comprises the following steps:
placing a thermal adhesion diaphragm between the positive and negative pole pieces, and manufacturing into a battery cell, wherein the thermal adhesion diaphragm is a diaphragm which has an adhesion effect on an electrode material at a preset temperature or pressure;
carrying out preheating treatment and/or flat pressing treatment on the battery cell, wherein the preheating treatment temperature is greater than or equal to the softening temperature of the hot adhesive material and is less than the melting temperature of the hot adhesive material; the pressure of the flat pressing treatment is greater than or equal to the yield limit of the hot viscous material;
shaping the preheated and/or flat-pressed battery cell;
and carrying out post-treatment on the shaped battery cell to obtain the lithium ion battery.
As an improvement of the above, the thermal adhesive membrane is a membrane coated with a thermal adhesive material on the surface, or a membrane made of a thermal adhesive material embedded in a base material, or a membrane made of a thermal adhesive material.
As an improvement of the scheme, the hot-viscous material is one or more of PVDF homopolymer, PVDF copolymer, polyamide, acrylic and polyacrylonitrile.
As an improvement of the scheme, the temperature of the preheating treatment is 55-150 ℃, and the heating time is 30 s-60 min.
As an improvement of the scheme, the flat pressing pressure is 0.1MPa to 10MPa, and the time is 10S to 5 min.
As an improvement of the above scheme, the post-treatment sequentially comprises:
and packaging, injecting, aging, forming and grading the shaped battery cell to obtain the lithium ion battery.
As an improvement of the scheme, the formation is normal-temperature normal-pressure formation, high-temperature formation or high-temperature high-pressure formation.
As an improvement of the scheme, the formation is normal-temperature and normal-pressure formation, the temperature of the formation is 20-90 ℃, the pressure of the formation is 0-4 MPa, and the formation time is 1-6 h.
As an improvement of the scheme, the shaping pressure of the shaping treatment is 0.1-6 MPa, the shaping time is 15 s-30 min, and the shaping temperature is 55-150 ℃.
As an improvement of the scheme, the aging temperature is 35-65 ℃, and the aging time is 1-24 hours.
Correspondingly, the invention also discloses a high-performance lithium battery prepared by the preparation method.
The implementation of the invention has the following beneficial effects:
the invention arranges the hot-sticking diaphragm between the positive and negative pole pieces, prepares the battery core by winding or laminating, and prepares the high-performance lithium ion battery after preheating and/or flat pressing, shaping, packaging, injecting, aging, forming and grading, can simultaneously realize the reduction of energy consumption, the simplification of process conditions, the reduction of equipment investment, the reduction of potential safety hazards, the reduction of the use requirement of electrolyte, the high finished product rate of battery matching, the guarantee of the high consistency and stability of the appearance size of the battery, and the high performance consistency and stability, which are specifically as follows:
(1) the invention selects the thermal adhesive diaphragm, places the thermal adhesive diaphragm between the positive pole piece and the negative pole piece, and can enable different areas of each layer of diaphragm, pole piece, the same layer of diaphragm and pole piece of the lithium battery cell to reach the preset temperature better through proper preheating treatment, thereby greatly reducing the temperature difference of the diaphragm, the pole piece and the different areas thereof, improving the stability of the cohesive force of each area, improving the interface stability of each layer of pole piece and the diaphragm of the battery cell, and further improving the performance consistency and the stability of the lithium battery.
(2) The battery core with the thermal adhesive diaphragm is subjected to preheating treatment, the temperature of the preheating treatment is greater than or equal to the softening temperature of the thermal adhesive material and less than the melting temperature of the thermal adhesive material, so that the thermal adhesive material is fully and uniformly heated and reaches uniform diffusion temperature, and the battery is ensured to have good performance, good performance consistency and stability.
(3) The invention carries out flat pressing treatment on the battery core with the thermal adhesion diaphragm, the pressure of the flat pressing is more than or equal to the yield limit of the thermal adhesion material, so that the thermal adhesion material is plastically deformed and embedded between the anode material and the cathode material, the interface impedance is reduced, the deformation amount of the anode material and the cathode material in the charging and discharging process of the battery is reduced, and the consistency of the battery is improved.
(4) The invention adjusts the shaping process by matching with the thermal adhesive diaphragm and the preheating and/or flat pressing steps, so that the pole piece and the diaphragm in the battery can be connected more closely, and the consistency and the stability of the appearance size are improved.
(5) According to the invention, the lithium battery cell with good interface consistency is prepared in advance through the synergistic effect of the thermal adhesion diaphragm and the preheating and/or flat pressing and shaping steps, and the operations such as high temperature and high pressure in the formation process in the conventional process are not needed. Therefore, the formation of the invention can adopt normal temperature and normal pressure formation, optimizes the preparation process of the power battery, does not need formation under high temperature and high pressure, does not need to be provided with operating equipment, reduces the requirement of electrolyte, avoids artificial dangerous operation, improves the safety coefficient of battery preparation, and simultaneously improves the stability and consistency of battery performance.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below.
In the conventional preparation method of the lithium battery, the formation steps generally reduce the interface impedance between the anode and the cathode and the diaphragm through high-temperature and high-pressure external conditions and the like, so that the lithium ion permeability is improved, the formation of an SEI film is accelerated, the compactness of the SEI film is improved, and the problems of high energy consumption, complex and expensive equipment, special and expensive electrolyte, poor stability of the battery and the like in the conventional preparation method of the lithium battery are caused.
Therefore, the invention provides a preparation method of a high-performance lithium battery, which can be a winding lithium ion battery, a laminated lithium ion battery, a square lithium ion battery, a soft package lithium ion battery and other liquid lithium ion batteries, a polymer lithium ion battery, a semi-solid lithium ion battery and an all-solid lithium ion battery. Moreover, the lithium battery of the invention is particularly a power lithium battery, which can be applied to all-electric power automobiles, hybrid automobiles or electric automobiles.
The preparation method of the high-performance lithium battery comprises the following steps:
(1) placing the thermal adhesive diaphragm between the positive and negative pole pieces, and manufacturing a battery core;
(2) carrying out preheating treatment and/or flat pressing treatment on the battery cell, wherein the preheating treatment temperature is greater than or equal to the softening temperature of the hot adhesive material and is less than the melting temperature of the hot adhesive material; the pressure of the flat pressing process is greater than or equal to the yield limit of the hot-viscous material.
(3) Shaping the preheated and/or flat-pressed battery cell;
(4) and carrying out post-treatment on the shaped battery cell to obtain the lithium ion battery.
The thermal adhesive membrane is a membrane having an adhesion effect on an electrode material at a predetermined temperature or pressure, and may be a membrane with a thermal adhesive material coated on the surface thereof, or a membrane with a thermal adhesive material embedded in a substrate, or a membrane made of a thermal adhesive material, but is not limited thereto. It should be noted that, as long as the lithium ion battery has thermal adhesion performance and can conduct lithium ions, the lithium ion battery is suitable for use between the positive and negative pole pieces of the power lithium battery, and the lithium ion battery belongs to the protection scope of the invention. The preset temperature or pressure of the thermal adhesive membrane may vary depending on different materials.
In a preferred embodiment of the thermal adhesive separator, the surface of the thermal adhesive separator is coated with a thermal adhesive material, and the thermal adhesive material is coated on the surface of the separator to form a coating layer. The coating can be a single layer or multiple layers and can be disposed on one or both sides of the substrate membrane. The hot tack material may be a pure hot tack material or a hybrid hot tack material.
As another preferred embodiment of the thermal adhesive membrane, the thermal adhesive membrane is a membrane made of a thermal adhesive material embedded in a base material, and may be a pure thermal adhesive material embedded membrane or a mixed thermal adhesive material embedded membrane. The selection of the substrate can be carried out according to the prior art.
As still another preferred embodiment of the heat-adhesive separator, the heat-adhesive separator is a separator made of a heat-adhesive material, and the heat-adhesive material may be a pure heat-adhesive material or a mixed heat-adhesive material.
In various embodiments of the above thermal adhesive membrane, the thermal adhesive material is one or more of PVDF homopolymer, PVDF copolymer, polyamide, acrylic, and polyacrylonitrile.
The hot-melt adhesive material to be mixed may be a mixture of two or more of the hot-melt adhesive materials described above, or may be a mixture of one or more of the hot-melt adhesive materials described above and one or more of the non-hot-melt adhesive materials. The non-thermal adhesive material can be organic material, such as aramid fiber, PET, PU fiber, or inorganic material, such as alumina, boehmite, barium sulfate, etc.
The invention selects the thermal adhesive diaphragm, places the thermal adhesive diaphragm between the positive pole piece and the negative pole piece, and can enable different areas of each layer of diaphragm, pole piece, the same layer of diaphragm and pole piece of the lithium battery cell to reach the preset temperature better through proper preheating treatment, thereby greatly reducing the temperature difference of the diaphragm, the pole piece and the different areas thereof, improving the stability of the cohesive force of each area, improving the interface stability of each layer of pole piece and the diaphragm of the battery cell, and further improving the consistency of the lithium battery.
In the prior art, some batteries use a thermal adhesive material, but the thermal adhesive material is generally applied between an electrode assembly and a battery case to fix the electrode assembly and the battery case to solve the problem of appearance defects. Or a thermal adhesive material is applied to the battery packaging material. However, the thermal adhesive diaphragm of the invention has micropores, can conduct lithium ions, is arranged between the positive and negative electrode plates, has an adhesion effect on positive and negative electrode materials, needs to solve the problem of adaptation of the thermal adhesive diaphragm and the positive and negative electrode plates of the battery, and can improve the electrical property, stability and consistency of the battery.
The hot-sticking diaphragm is arranged between the positive and negative pole pieces, the battery core is manufactured in a winding or lamination mode, and then preheating treatment is carried out, so that the hot-sticking diaphragm is softened at the preheating temperature but not melted, and the subsequent shaping is easy to operate. The preheating treatment can be carried out in an oven or a tunnel furnace, preferably the tunnel furnace is adopted for mass production processing so as to facilitate continuous production, the length of the tunnel furnace is 3-10m, preferably 5-8 m, if the tunnel furnace is too long, the occupied area is too large, and if the tunnel furnace is too short, the sufficiency of preheating is difficult to ensure.
The invention performs a preheating treatment, which has the function of enabling the thermal adhesive material to be heated fully and uniformly and achieving a uniform diffusion temperature. Therefore, the problem that the thermal adhesion material mechanics is uneven due to uneven temperature can be avoided, the diaphragm is locally uneven and poor in flatness when being bonded with the positive electrode or the negative electrode under the same layer number of the lithium battery cell is avoided, the difference that the outer layer of the lithium battery cell is high in temperature, excessive bonding is caused, holes are blocked, and the inner layer of the lithium battery cell is low in temperature and poor in bonding is avoided under the conventional process, so that the interface stability of the positive and negative pole pieces and the diaphragm in different layers and the same layer of the lithium battery cell is improved, and the consistency of the. The preheating temperature is selected between the softening temperature and the melting temperature of the thermal adhesive material and is determined by the softening temperature and the diffusion effect of the thermal adhesive material, and the preheating temperature is generally 55-150 ℃, and preferably 60-120 ℃. The preheating time is determined by the diffusion effect, and is generally 30 s-60 min, preferably 1-30 min.
The preheating temperature and time of the invention are related to the thermal adhesive diaphragm, and are one of the key factors which directly determine whether the thermal adhesive material can be heated sufficiently and uniformly and reach the uniform diffusion temperature. If the preheating temperature is more than 150 ℃ and the preheating time is more than 60min, the hot viscous material can excessively flow, and the pores are blocked; if the preheating temperature is less than 55 ℃ and the preheating time is less than 30s, the softening degree of the hot-viscous material is insufficient, the shaping effect is poor, and the internal resistance, the capacity, the performance stability and the like of the battery are poor.
In the prior art, the battery pole piece is baked in a nitrogen environment at the baking temperature of 50-55 ℃ for 6-12 h, and then the battery pole piece is immersed in the electrolyte. The baking process in the scheme is different from the preheating treatment process of the invention, is not the preheating procedure of the invention, and aims to remove water from the battery pole core, prevent the electrolyte from generating gas when meeting water and reduce the capacity and performance of the battery.
Besides the preheating treatment, the electric core can also adopt the flat pressing treatment or the simultaneous preheating and flat pressing treatment so as to soften the hot-sticking diaphragm but not melt the same, so that the subsequent shaping is easy to operate. Preferably, the flat pressing pressure is 0.1MPa to 10MPa, and the time is 10S to 5 min. More preferably, the flat pressing pressure is 1MPa to 8MPa, and the time is 1min to 4 min.
And shaping the preheated battery cell, wherein the shaping pressure of the shaping treatment is 0.1-6 MPa, the shaping time is 15 s-30 min, and the shaping temperature is 55-150 ℃. Preferably, the shaping pressure of the shaping treatment is 0.2-4 MPa, the shaping time is 30 s-20 min, and the shaping temperature is 60-120 ℃. The shaping process may be performed in a press.
The invention adjusts the shaping process by matching with the thermal adhesive diaphragm and the preheating step, so that the pole piece and the diaphragm in the battery are more closely connected, and the battery has consistent appearance size with better stability.
The electric core after the plastic needs to be subjected to post-processing, and the post-processing sequentially comprises: and packaging, injecting, aging, forming, secondarily packaging and grading the shaped battery cell to obtain the lithium ion battery.
The package may be an aluminum-plastic film package, a steel case package, an aluminum case package, and a plastic case package, but is not limited thereto.
The temperature of the aging is preferably 35-65 ℃, and the time of the aging is preferably 1-24 h.
The formation can be normal temperature and pressure formation, high temperature formation or high temperature and high pressure formation. Preferably, the formation is normal temperature and normal pressure formation.
According to the invention, the lithium battery cell with good interface consistency is prepared in advance through the synergistic effect of the thermal adhesion diaphragm and the preheating and shaping steps, and the operations such as high temperature and high pressure in a formation process in a conventional process are not needed. Therefore, the formation of the invention can adopt normal temperature and pressure formation, optimizes the preparation process of the power battery, and solves a series of defects caused by high temperature and high pressure required by a general formation process for obtaining a lithium ion battery with higher performance, such as complex design of a clamp for high temperature and high pressure formation, high equipment investment, time and labor waste of the clamp on a battery core, easy scald and clamp injury of workers, and high energy consumption for keeping a high temperature and high pressure state for a long time. And the performance difference between the outer layer and the inner layer of the battery cell is large, the performance of the battery cell is unstable, the performance difference between the battery cells is large, and the matching rate is low under the conditions of heat transfer and pressure. The battery prepared by the method has the advantages of higher yield, higher consistency and stability of appearance size and higher consistency and stability of performance.
Preferably, the formation temperature is 20-90 ℃, the formation pressure is 0-4 MPa, and the formation time is 1-6 h. Preferably, the temperature of the formation is 20-50 ℃, the pressure of the formation is 0-2 MPa, and the time of the formation is 1-5 h. Preferably, the formation temperature is 20-30 ℃, the formation pressure is 0MPa, and the formation time is 1-4.5 h.
The secondary packaging can be selected according to requirements, and can be provided with or without a secondary packaging process.
In summary, the invention aims at the technical problems of poor performance consistency and stability of the power lithium battery, and achieves the following technical effects by optimizing the process: 1. the process operation process is simple, the energy consumption is low, the equipment investment is low, and the requirement on electrolyte is low; 2. secondary packaging may or may not be available; 3. high-temperature and high-pressure formation is not needed, and the production safety coefficient is improved; 4. the consistency and the stability of the appearance size of the power battery are improved, the yield of the power battery is improved, and the consistency and the stability of the performance of the power battery are improved.
Correspondingly, the invention also discloses a high-performance lithium battery prepared by the preparation method, and the battery has low cost, high appearance size consistency and stability and high performance consistency and stability.
The invention is further illustrated by using 486090-.
Example 1
Placing the PVDF-HFP coating diaphragm between a positive pole piece and a negative pole piece, winding the diaphragm into a flat or oval battery core, preheating for 10min at 60 ℃, shaping for 1min at 1Mpa and 60 ℃, placing the battery core into a steel shell for packaging, injecting electrolyte, aging for 2h at 45 ℃, forming for 2.5h at normal temperature without pressure, and obtaining the high-performance lithium ion battery after capacity grading.
Example 2
Placing an acrylic coating diaphragm between a positive pole piece and a negative pole piece, laminating in a Z shape to form a battery core, preheating for 5min at 80 ℃, shaping for 1min at 2MPa and 80 ℃, placing an aluminum-plastic film for packaging, injecting electrolyte, aging for 4h at 40 ℃, converting into 1.5h at normal temperature without pressure, and grading to obtain the high-performance lithium ion battery.
Example 3
Placing a PVDF-HFP/aluminum oxide coating diaphragm between a positive pole piece and a negative pole piece, laminating in a Z shape to form a battery core, preheating for 20min at 65 ℃, shaping for 1min at 0.5MPa and 70 ℃, placing the battery core into a plastic shell for packaging, injecting electrolyte, aging for 8h at 40 ℃, converting into 1.2h at normal temperature without pressure, packaging for the second time, and grading to obtain the high-performance lithium ion battery.
Example 4
Placing a polyacrylonitrile/barium sulfate embedded diaphragm between a positive pole piece and a negative pole piece, winding the diaphragm into a flat or oval battery core, preheating for 2min at 105 ℃, shaping for 30s at 110 ℃ under 0.2MPa, placing the battery core into an aluminum shell for packaging, injecting electrolyte, aging for 12h at 65 ℃, converting into 3h at normal temperature without pressure, packaging for the second time, and grading to obtain the high-performance lithium ion battery.
Example 5
Placing the PVDF/aramid fiber/boehmite embedded diaphragm between a positive pole piece and a negative pole piece, winding the diaphragm into a flat or oval battery core, preheating for 1min at 120 ℃, shaping for 30s at 0.2MPa and 120 ℃, placing the battery core into a steel shell for packaging, injecting electrolyte, aging for 3h at 40 ℃, converting into 3.5h at normal temperature without pressure, packaging for the second time, and grading to obtain the high-performance lithium ion battery.
Example 6
Placing a pure PVDF diaphragm between a positive pole piece and a negative pole piece, laminating in a Z shape to form a battery core, preheating for 30min at 70 ℃, shaping for 20min at 4MPa and 70 ℃, placing in a steel shell for packaging, injecting electrolyte, aging for 18h at 55 ℃, forming for 4.5h at normal temperature without pressure, and grading to obtain the high-performance lithium ion battery.
Example 7
Placing a pure PVDF diaphragm between a positive pole piece and a negative pole piece, laminating in a Z shape to form a battery core, flattening for 5min at 6MPa, then shaping for 30min at 0.5MPa and 60 ℃, placing in a steel shell for packaging, injecting electrolyte, aging for 18h at 55 ℃, forming for 4.5h at normal temperature without pressure, and obtaining the high-performance lithium ion battery after capacity grading.
Comparative example 1
Placing the PVDF-HFP coating diaphragm between a positive pole piece and a negative pole piece, winding into a flat or oval battery core, placing into a steel shell for packaging, injecting electrolyte, aging at 45 ℃ for 2h, aging at 1Mpa and 60 ℃ for 2.5h, packaging for the second time, and grading to obtain the lithium ion battery.
Comparative example 2
Placing an acrylic coating diaphragm between a positive pole piece and a negative pole piece, laminating in a Z shape to form a battery core, placing the battery core into an aluminum-plastic film for packaging, injecting an electrolyte, aging at 40 ℃ for 4h, aging at 2MPa and 85 ℃ for 3.5h, performing secondary packaging, and grading to obtain the lithium ion battery.
Comparative example 3
Placing the PVDF-HFP/aluminum oxide coating diaphragm between a positive pole piece and a negative pole piece, laminating in a Z shape to form a battery core, placing the battery core in a plastic shell for packaging, injecting electrolyte, aging at 40 ℃ for 8h, aging at 3MPa and 90 ℃ for 1.2h, packaging for the second time, and grading to obtain the lithium ion battery.
Comparative example 4
Placing the polyacrylonitrile/barium sulfate embedded diaphragm between a positive pole piece and a negative pole piece, winding into a flat or oval battery core, placing into an aluminum shell for packaging, injecting electrolyte, aging at 65 ℃ for 12h, aging at 2MPa and 80 ℃ for 3h, carrying out secondary packaging, and carrying out capacity grading to obtain the high-performance lithium ion battery.
Comparative example 5
Placing the PVDF/aramid fiber/boehmite embedded diaphragm between a positive pole piece and a negative pole piece, winding the diaphragm into a flat or oval battery core, placing the flat or oval battery core into a steel shell for packaging, injecting electrolyte, aging for 3h at 40 ℃, aging for 3.5h at 4MPa and 85 ℃, packaging for the second time, and grading to obtain the high-performance lithium ion battery.
Comparative example 6
And (3) placing a pure PVDF diaphragm between the positive and negative pole pieces, laminating in a Z shape to form a battery core, placing the battery core into a steel shell for packaging, injecting electrolyte, aging at 55 ℃ for 18h, forming at 2MPa and 70 ℃ for 4.5h, packaging for the second time, and grading to obtain the high-performance lithium ion battery.
And (3) carrying out internal resistance, capacity, standard deviation (discrete degree), rate discharge, capacity retention rate, capacity recovery rate, voltage drop, circulation and other electrical property tests on the battery cell prepared by implementation and the battery cell prepared by comparison. Wherein, the internal resistance is lower, the capacity is higher, the dispersion is smaller, the multiplying power is higher, the pressure is reduced, the capacity retention rate is higher, and the capacity recovery rate is higher. Testing the internal resistance by an internal resistance tester; the capacity, the rate discharge, the capacity retention rate and the capacity recovery rate are tested by a charge-discharge tester; the voltage drop was measured by a voltage tester.
Standard deviation according to the formula
And (4) calculating.
Attached table 1: the internal resistance, capacity data, and standard deviation of examples 1-2 and comparative examples 1-2 are as follows (internal resistance unit: m.OMEGA., capacity unit: mAh)
Attached table 2: the internal resistance, capacity data, and standard deviation of examples 3 to 4 and comparative examples 3 to 4 are as follows (internal resistance unit: m.OMEGA., capacity unit: mAh)
Attached table 3: the internal resistance, capacity data, and standard deviation of examples 5 to 6 and comparative examples 5 to 6 are as follows (internal resistance unit: m.OMEGA., capacity unit: mAh)
Attached table 4: the electrical property data for the examples and comparative examples are as follows:
as can be seen from the data in tables 1 to 4, the electrical properties and data stability of the cells of the examples are significantly improved compared to those of the comparative examples. This has great improvement, yield and group rate to power battery, especially to sorting and the equipment of the great large-scale cluster group battery.
In summary, the invention arranges the thermal adhesive diaphragm between the positive and negative pole pieces, manufactures the electric core in a winding or laminating way, and manufactures the high-performance lithium ion battery after preheating, shaping, packaging, injecting, aging, forming and grading, thereby simultaneously realizing the purposes of reducing energy consumption, simplifying process conditions, simplifying equipment and raw materials, and ensuring high consistency and stability of the appearance size of the battery and high performance consistency and stability.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method for preparing a high-performance lithium battery is characterized by comprising the following steps:
placing a thermal adhesion diaphragm between the positive and negative pole pieces, and making into a battery cell, wherein the thermal adhesion diaphragm is a diaphragm which has an adhesion effect on an electrode material at a preset temperature or pressure;
carrying out preheating treatment and/or flat pressing treatment on the battery cell, wherein the temperature of the preheating treatment is greater than or equal to the softening temperature of the hot-sticking material and less than the melting temperature of the hot-sticking material, and the pressure of the flat pressing treatment is greater than or equal to the yield limit of the hot-sticking material;
shaping the preheated and/or flat-pressed battery cell;
and carrying out post-treatment on the shaped battery cell to obtain the lithium ion battery.
2. The method of manufacturing a high-performance lithium battery according to claim 1, wherein the thermal adhesive separator is a separator whose surface is coated with a thermal adhesive material, or a separator in which a thermal adhesive material is embedded in a base material, or a separator made of a thermal adhesive material.
3. The method of claim 1, wherein the thermal adhesive material is one or more of a PVDF homopolymer, a PVDF copolymer, a polyamide, an acrylic, and a polyacrylonitrile.
4. The method of claim 1, wherein the preheating is performed at a temperature of 55 to 150 ℃ for 30s to 60 min;
the pressure of the flat pressing treatment is 0.1MPa to 10MPa, and the time is 10s to 5 min.
5. The method of claim 1, wherein the post-treatment comprises, in order:
and packaging, injecting, aging, forming and grading the shaped battery cell to obtain the lithium ion battery.
6. The method of claim 5, wherein the formation is normal temperature and pressure formation, high temperature formation, or high temperature and pressure formation.
7. The method of claim 6, wherein the formation is carried out at normal temperature and pressure, the formation temperature is 20-90 ℃, the formation pressure is 0-4 MPa, and the formation time is 1-6 h.
8. The method for preparing a high-performance lithium battery as claimed in claim 1, wherein the shaping pressure of the shaping treatment is 0.1 to 6MPa, the shaping time is 15s to 30min, and the shaping temperature is 55 to 150 ℃.
9. The method for preparing a high-performance lithium battery as claimed in claim 8, wherein the aging temperature is 35 to 65 ℃ and the aging time is 1 to 24 hours.
10. A high performance lithium battery produced by the production method according to claims 1 to 9.
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| CN111477971A (en) * | 2020-05-26 | 2020-07-31 | 苏州凌威新能源科技有限公司 | Battery cell shaping method |
| WO2022227295A1 (en) * | 2021-04-26 | 2022-11-03 | 广东利元亨智能装备股份有限公司 | Transfer apparatus and method |
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