CN113270585A - Electrode material and preparation method and application thereof - Google Patents
Electrode material and preparation method and application thereof Download PDFInfo
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/366—Composites as layered products
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
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Abstract
The invention provides an electrode material and a preparation method and application thereof. The electrode material comprises an inner core and a thermistor layer; the inner core comprises an electrode active substance, and the thermistor layer comprises a negative temperature coefficient thermosensitive material, a conductive agent and a binder. According to the invention, the material particles with negative temperature coefficients are adopted, matched with the conductive agent and the binder and uniformly coated on the surfaces of the positive electrode active material particles or the negative electrode active material particles, so that the design similar to a core-shell structure is achieved, and the high-temperature cycle performance and the normal-temperature storage performance of the power battery can be improved under the condition of ensuring that the energy density loss is small.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and relates to an electrode material, and a preparation method and application thereof.
Background
In recent years, in order to solve the problem of environmental pollution, the development of electric vehicles is rapid, comprehensive electromotion is a future trend, and based on the requirement of the whole vehicle, the requirement of vehicle enterprises on the service life of a power battery is higher and higher, the requirement is gradually increased from the initial requirement of 7 years and 15 kilometers to the requirement of 15 years and 24 kilometers, the power battery is used as a core component of the electric vehicle, the service life of the power battery directly influences the service life of the whole vehicle, and therefore the development of a long-life battery meeting the current requirement of the energy density of the whole vehicle is urgently needed.
The method for improving the cycle performance of the power battery at present comprises the following two methods: (1) in the aspect of a positive electrode: a single-particle low-nickel-content system is adopted, so that the problem of cycle attenuation caused by accelerated consumption of active lithium due to particle breakage in the cycle process is solved; (2) negative electrode side: the graphite material is compacted by adopting single particles, and the surface coating is enhanced, so that the problem of cycle attenuation caused by the accelerated consumption of active lithium due to the particle breakage in the cycle process is solved.
However, the above-described solutions have some problems, for example, (1) in the positive electrode: the single-particle low-nickel-content system has the advantages that the size of the single particle is larger due to the problem of homogenate and agglomeration, so that a longer solid phase diffusion path is brought, the power performance of a battery core is deteriorated, and the specific capacity of a low-nickel-content material is lower, so that the energy density of a battery system is reduced, and the energy density and the cost of a whole vehicle are deteriorated; (2) negative electrode side: the single particle compact graphite material and the reinforced surface coating scheme have the problems of long solid phase diffusion path, the charging power of the battery cell is deteriorated, the fast charging performance on the whole vehicle is deteriorated, the compact surface strong coating increases the manufacturing cost of the graphite, and the cost influence on the whole vehicle is larger.
CN103022555A discloses a lithium ion battery, which comprises an anode, a cathode and an electrolyte, wherein the electrolyte comprises a lithium salt and a solvent, and the active material of the anode is a lithium-rich manganese-based solid solution; the active material of the negative electrode is lithium titanate; the solvent comprises fluoro carbonic ester and one or more additives of fluoro methyl sulfolane or derivatives thereof, fluoro methyl ethylene sulfite or derivatives thereof, and fluoro methyl ethylene sulfate or derivatives thereof. The lithium-rich manganese-based solid solution material has the advantages of high capacity, low material cost and a stable structure, lithium titanate has good safety and excellent cycle performance, but the specific energy and the specific capacity of the lithium titanate are low, the conductivity is poor, the lithium titanate is used as a negative electrode active material, the advantage of high gram capacity of the lithium-rich manganese-based solid solution material is greatly limited to be fully exerted, an electrode material system of the battery only improves the safety of the battery, and the energy density of the battery is still low.
CN107946551A discloses a doped lithium nickel manganese oxide material, a modified lithium nickel manganese oxide positive electrode and a preparation method thereof, wherein the positive electrode is a positive electrodeIonic yttrium doping and Li2SnO3Surface coating is carried out to improve the structural stability of the lithium nickel manganese oxide positive electrode material and inhibit side reaction of a contact interface, but Li2SnO3Not electrochemically active itself, and can reduce the energy density of the active material.
Therefore, how to improve the cycle and storage performance of the power battery while maintaining the energy density without deterioration is an urgent technical problem to be solved.
Disclosure of Invention
The invention aims to provide an electrode material and a preparation method and application thereof. The invention adopts the material particles with Negative Temperature Coefficient (NTC), matches with the conductive agent and the binder, and uniformly coats the surfaces of the positive electrode or Negative electrode active material particles, thereby achieving the design similar to a core-shell structure, and improving the high-Temperature cycle performance and the normal-Temperature storage performance of the power battery under the condition of ensuring that the energy density loss is less.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides an electrode material comprising a core and a thermistor layer; the inner core comprises an electrode active substance, and the thermistor layer comprises a negative temperature coefficient thermosensitive material, a conductive agent and a binder.
The electrode material provided by the invention can be used as a positive electrode material and a negative electrode material, and different active substances are selected to obtain different types of electrode materials.
The surface of the electrode active substance is coated with the conductive agent, the binder and the negative temperature coefficient thermosensitive material, and the three materials have synergistic effect, so that the uniform and stable coating effect is ensured, wherein the binder plays a role in strengthening and fixing, the falling of material particles with negative temperature coefficients on the outer layer in the charging and discharging processes is prevented, and the conductive agent plays a role in winding and coating.
The method of the invention does not need to adopt complex sintering steps in the preparation process, thereby avoiding the structure of the material from being damaged.
The electrode material of the invention can not only improve the storage life of the battery, but also improve the service life of the battery, in particular to a power battery, and the technical principle is as follows: the initial impedance of the negative temperature coefficient thermosensitive material is very high, so that the impedance between particles in the electrode in an initial state is relatively high, and finally the initial electrical core activity is relatively low, and the performance can greatly reduce side reactions when the negative temperature coefficient thermosensitive material is stored at normal temperature, so that the storage performance of the negative temperature coefficient thermosensitive material at normal temperature is improved, and the service life of a battery and a whole vehicle power battery system can be effectively prolonged by considering that the whole service life of a vehicle is in a storage state for most of time; meanwhile, when the battery core is charged and discharged circularly, the battery core can be preheated to more than 40 ℃, the impedance of the negative temperature coefficient thermosensitive material coated on the surface of the electrode active substance is gradually reduced along with the increase of the temperature, so that the impedance between particles in the electrode is reduced, the activity of the battery core is increased, the charging and discharging are recovered to be normal, the high-temperature cycle performance of the battery core is relatively improved, and the battery core temperature is basically about 40 ℃ in the normal driving process of the whole vehicle in consideration of the environment of the whole vehicle in the using process and the heating of the battery, so that the service life of the power battery of the whole vehicle can be effectively prolonged.
Preferably, the mass ratio of the negative temperature coefficient thermosensitive material in the electrode material is 1 to 10%, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or the like, based on 100% by mass of the electrode material.
In the invention, the mass ratio of the negative temperature coefficient thermosensitive material in the electrode material is too high, which results in large energy density loss, and the life improvement amplitude is less due to too low mass ratio.
Preferably, the conductive agent accounts for 0.5-5% by mass, such as 0.5%, 1%, 2%, 3%, 4% or 5% by mass of the electrode material, based on 100% by mass of the electrode material.
Preferably, the mass ratio of the binder is 1 to 3%, for example, 1%, 2%, 3%, or the like, based on 100% by mass of the electrode material.
Preferably, the negative temperature coefficient thermosensitive material comprises a thermosensitive semiconductive ceramic material.
In the invention, the thermosensitive semiconductor ceramic material is selected, and has the advantage that the initial impedance is very high, so that the impedance among particles in the electrode in an initial state is relatively high, and finally the initial cell activity is relatively low, and the performance can greatly reduce side reactions when the electrode is stored at normal temperature, thereby improving the storage performance of the electrode at normal temperature.
Preferably, the heat-sensitive semiconductor ceramic material comprises any one of manganese oxide ceramic, nickel oxide ceramic, cobalt oxide ceramic or copper oxide ceramic or a combination of at least two of the same.
Preferably, the particle size of the negative temperature coefficient thermosensitive material is 100-800 nm, such as 100nm, 200nm, 300nm, 400nm, 500nm, 600nm, 700nm or 800 nm.
Preferably, the electrode active material is 3 to 10 μm, for example, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, or 10 μm.
In the invention, the particle size of the active substance is larger, and the particle size of the negative temperature coefficient thermosensitive material is convenient for being adsorbed on the surface of large particles of the internal active substance material.
Preferably, the conductive agent is selected from fibrous, tubular, linear or sheet conductive agents, preferably including any one or a combination of at least two of carbon fibers, carbon nanotubes or graphene.
According to the invention, by adopting the conductive agent, the negative temperature coefficient thermosensitive material on the outer layer can be wound and wrapped together more effectively, and is uniformly coated and fixed on the surface of the active substance in the inner part.
Preferably, the binder comprises any one of polyvinylidene fluoride, polytetrafluoroethylene, polypropylene, styrene butadiene rubber, styrene butadiene latex, polybutylene, polyacrylate or polybutylene ester or a combination of at least two of them.
Preferably, the electrode active material is a positive electrode active material or a negative electrode active material.
Preferably, the positive electrode active material includes any one of lithium iron phosphate, lithium cobaltate, lithium titanate, or nickel cobalt manganese, or a combination of at least two of them.
Preferably, the negative active material includes a graphite material.
In a second aspect, the present invention provides a method for preparing an electrode material according to the first aspect, the method comprising:
mixing an electrode active substance, a negative temperature coefficient thermosensitive material, a conductive agent, a binder and a solvent to obtain the electrode material.
The preparation method provided by the invention is simple to operate, convenient to control and suitable for large-scale production.
Preferably, the negative temperature coefficient thermosensitive material comprises a thermosensitive semiconductor ceramic material, and the preparation method of the thermosensitive semiconductor ceramic material comprises the following steps:
and sintering the metal oxide to obtain the thermosensitive semiconductor ceramic material.
The thermosensitive semiconductor ceramic material provided by the invention is obtained by sintering metal oxide by adopting an electronic ceramic preparation method at high temperature.
Preferably, the metal oxide comprises any one of manganese oxide, nickel oxide, copper oxide or cobalt oxide or a combination of at least two thereof.
Preferably, the sintering temperature is 1200-1400 ℃, such as 1200 ℃, 1250 ℃, 1300 ℃, 1350 ℃, or 1400 ℃, and the like.
In a third aspect, the present invention also provides a lithium ion battery comprising the electrode material according to the first aspect.
Preferably, the lithium ion battery is a lithium ion power battery.
The negative temperature coefficient thermosensitive material has high initial impedance, so that the impedance among particles in an initial state electrode is large, and the initial cell activity is low finally, the performance can greatly reduce side reactions when the material is stored at normal temperature, so that the storage performance of the material at normal temperature is improved, and the service life of a battery and a whole vehicle power battery system can be effectively prolonged considering that the whole service life of a vehicle is in a storage state for most of time; meanwhile, when the battery core is charged and discharged circularly, the battery core can be preheated to more than 40 ℃, the impedance of the negative temperature coefficient thermosensitive material coated on the surface of the electrode active substance is gradually reduced along with the increase of the temperature, so that the impedance between particles in the electrode is reduced, the activity of the battery core is increased, the charging and discharging are recovered to be normal, the high-temperature cycle performance of the battery core is relatively improved, and the battery core temperature is basically about 40 ℃ in the normal driving process of the whole vehicle in consideration of the environment of the whole vehicle in the using process and the heating of the battery, so that the service life of the power battery of the whole vehicle can be effectively prolonged.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the material particles with negative temperature coefficients are adopted, matched with the conductive agent and the binder and uniformly coated on the surfaces of the positive electrode active material particles or the negative electrode active material particles, so that the design similar to a core-shell structure is achieved, and the high-temperature cycle performance and the normal-temperature storage performance of the power battery can be improved under the condition of ensuring that the energy density loss is small. Under the condition that the negative electrodes are consistent, the battery provided by the invention can be cycled for at least over 1000 circles at 45 ℃, the capacity retention rate is possibly less than or equal to 80%, and the battery can be stored for 10.2 years or even longer at normal temperature; under the condition that the positive electrodes are consistent, the battery provided by the invention can be stored for 9.4 years or even longer at normal temperature, and the capacity retention rate is possibly less than or equal to 80% only after at least 916 cycles at 45 ℃.
Drawings
Fig. 1 is a schematic structural diagram of an electrode material provided in an embodiment.
1-inner core, 2-negative temperature coefficient heat-sensitive material, 3-conductive agent and 4-adhesive.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
In one embodiment, the invention provides an electrode material, the electrode material is a positive electrode material or a negative electrode material,
the electrode material comprises an inner core 1 and a thermistor layer; the inner core 1 comprises an electrode active substance, and the thermistor layer comprises a negative temperature coefficient thermosensitive material 2, a conductive agent 3 and a binder 4.
In one embodiment, the present invention also provides a method for preparing an electrode material, the method comprising:
mixing an electrode active substance, a negative temperature coefficient thermosensitive material 2, a binder 4 and a conductive agent 3, wherein the mass ratio of the total mass of the electrode active substance and the negative temperature coefficient thermosensitive material 2 to the mass of the binder 4 to the mass of the conductive agent 3 is 98:1:1, then adding a solvent, and drying to obtain an electrode material;
when the electrode material is a positive electrode material, the solvent is N-methyl pyrrolidone, and when the electrode material is a negative electrode, the solvent is deionized water.
The positive electrode material or the negative electrode material provided in the following examples was prepared by the method according to the embodiment of the above-described examples.
Examples 1 to 6
Examples 1 to 6 provide electrode materials as positive electrode materials in which the positive electrode active material is LiNi0.5Co0.2Mn0.3O2Table 1 shows the compositions of the electrode materials provided in examples 1 to 6, where the mass ratio refers to the mass ratio of the negative temperature coefficient thermal sensitive material in the electrode material.
TABLE 1
Examples 7 to 12
The electrode materials provided in examples 7 to 12 are negative electrode materials in which a negative electrode active material is graphite, a binder is styrene butadiene rubber, a conductive agent is carbon nanotubes, and a negative temperature coefficient thermosensitive material is copper oxide ceramic, and the compositions of the electrode materials provided in examples 7 to 12 are shown in table 2, where the mass ratio refers to the mass ratio of the negative temperature coefficient thermosensitive material in the electrode materials.
TABLE 2
Comparative example 1
This comparative example provides a positive electrode material that was LiNi0.5Co0.2Mn0.3O2。
Comparative example 2
The comparative example provides a positive electrode material, which is LiFePO4。
Comparative example 3
The present comparative example provides a negative electrode material, which is graphite.
The positive electrodes were prepared by using the positive electrode materials provided in examples 1 to 6 and comparative examples 1 to 2, respectively, and the preparation methods were as follows:
homogenizing according to the weight ratio of polyvinylidene fluoride (PVDF) to conductive carbon black (SP) of 95:3:2 as a positive electrode material, adding NMP to control the solid content to be 70%, and stirring, and uniformly coating the positive electrode slurry on the surface of a 12-micron thick aluminum foil substrate with the double-side coating weight of 300g/m2And then drying, rolling, die cutting and punching to obtain the positive pole piece.
Negative electrodes were prepared from the negative electrode materials provided in examples 7 to 12 and comparative example 3, respectively, by the following preparation methods:
homogenizing according to the weight ratio of styrene butadiene rubber to sodium carboxymethylcellulose to SP (95: 2.5:1.5: 1), adding water to control the solid content to be 50% and the viscosity to be 3000mpa & s, stirring, uniformly coating the negative electrode slurry on the surface of a copper foil substrate with the thickness of 8 mu m, wherein the coating weight of the two surfaces of the copper foil substrate is 160g/m2And then drying, rolling, die cutting and punching to obtain the negative pole piece.
Application examples 1 to 14
Assembling a cell by taking the positive plate provided by the examples 1-5 as a positive electrode and the negative plate provided by the comparative example 3 as a negative electrode to obtain application examples 1-5;
assembling a battery cell by taking the negative electrode sheets provided by the embodiments 7-11 as negative electrodes and the positive electrode sheet provided by the comparative example 1 as positive electrodes to obtain application examples 6-10;
assembling a cell by using the positive plate provided in example 3 as a positive electrode and the negative plate provided in example 9 as a negative electrode, to obtain application example 11;
assembling a battery cell by taking the positive plate provided in the embodiment 6 as a positive electrode and the negative plate provided in the embodiment 12 as a negative electrode, so as to obtain an application example 12;
assembling a cell by taking the positive plate provided by the comparative example 1 as a positive electrode and the negative plate provided by the comparative example 3 as a negative electrode to obtain an application example 13;
the positive electrode sheet provided in comparative example 2 was used as the positive electrode, and the negative electrode sheet provided in comparative example 3 was used as the negative electrode, and a cell was assembled to obtain application example 14.
And (3) charging the battery cell provided by the application examples 1-14 to 4.2V at a constant current of 0.33C and a constant voltage at room temperature in a charging and discharging test cabinet, discharging to 2.8V at a discharging current of 0.33C after standing for 10min, and recording the discharging capacity and the average discharging voltage.
Energy is the discharge capacity and the average discharge voltage.
The cell weights provided in application examples 1-14 were measured using an electronic scale, and the cell weight energy density was the average discharge voltage/cell weight of the discharge capacity.
Table 3 shows the results of applying the data of capacity, energy density and internal resistance of the cells provided in examples 1 to 14.
TABLE 3
From the data results of application examples 1 to 10, it is understood that as the proportion of the negative temperature coefficient heat-sensitive material increases, the internal resistance increases.
From the data results of application examples 1 to 12 and application examples 13 to 14, it is found that the electrode material provided by the present invention has small capacity and energy density loss, and can substantially control energy loss well.
And then, the performance tests of high-temperature circulation and normal-temperature storage are carried out on the battery cells provided by the application examples 1-14.
The test conditions were as follows:
the battery cell provided by application examples 1-14 is placed in a constant temperature box at 45 ℃, constant current of 0.33C is adopted, constant voltage charging is carried out until the battery cell is 4.2V, the battery cell is placed for 5min, then discharging is carried out until the battery cell is 2.8V by adopting discharging current of 0.33C, discharging capacity is recorded, capacity retention rate is equal to corresponding number of turns of discharging capacity/initial discharging capacity, the process is repeated until the capacity retention rate is less than or equal to 80%, and the number of cycles is recorded.
At room temperature, the battery cells provided in application examples 1-14 are charged to 4.2V at a constant current of 0.33C and a constant voltage, then the battery cells are placed in a thermostat at 25 ℃, the capacity retention rate is tested every 30 days, the capacity retention rate corresponds to the discharge capacity/initial discharge capacity every 30 days, the process is repeated until the capacity retention rate is less than or equal to 80%, and the storage days are recorded.
When the tests of application examples 1 to 14 were carried out, two sets of repeated experiments were carried out, and the results are shown in Table 4.
TABLE 4
From the data results of application examples 1-11 and application example 13, it can be seen that the high-temperature cycle performance and the normal-temperature storage performance of the battery prepared from the electrode material provided by the invention are both obviously improved.
And the data results of the application examples 1-5 and 6-10 show that the high-temperature cycle performance and the normal-temperature storage performance of the negative temperature coefficient thermosensitive material are improved more greatly as the mass ratio of the negative temperature coefficient thermosensitive material is increased.
From the data results of application examples 11 and 13, and application examples 12 and 14, it can be seen that the high-temperature cycle performance and the normal-temperature storage performance of the batteries prepared from the electrode materials of different types provided by the invention are also obviously improved.
The data results of the application examples 1 to 5 and the application examples 6 to 10 in tables 3 and 4 show that as the mass proportion of the negative temperature coefficient thermosensitive material increases, the capacity and the energy density of the negative temperature coefficient thermosensitive material are reduced, the internal resistance of the negative temperature coefficient thermosensitive material is increased obviously, and the high-temperature cycle performance and the normal-temperature storage performance of the negative temperature coefficient thermosensitive material are improved to a greater extent, so that when the mass proportion of the negative temperature coefficient thermosensitive material is preferably 1-10%, the high-temperature cycle performance and the normal-temperature storage performance of the negative temperature coefficient thermosensitive material can be improved obviously under the condition of ensuring less energy loss.
In summary, the invention adopts the material particles with negative temperature coefficient, matches with the conductive agent and the binder, and uniformly coats the surface of the positive electrode active material particles or the negative electrode active material particles to achieve a design similar to a core-shell structure, so that the high-temperature cycle performance and the normal-temperature storage performance of the power battery can be improved under the condition of ensuring less energy density loss, and the negative electrode is kept consistent, the battery provided by the invention can be cycled for at least 1000 cycles at 45 ℃, the capacity retention rate is possibly less than or equal to 80%, and the battery can be stored for 10.2 years or even longer at normal temperature; under the condition that the positive electrodes are consistent, the battery provided by the invention can be stored for 9.4 years or even longer at normal temperature, and the capacity retention rate is possibly less than or equal to 80% only after at least 916 cycles at 45 ℃.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. An electrode material, characterized in that the electrode material comprises an inner core and a thermistor layer; the inner core comprises an electrode active substance, and the thermistor layer comprises a negative temperature coefficient thermosensitive material, a conductive agent and a binder.
2. The electrode material according to claim 1, wherein the mass ratio of the negative temperature coefficient thermosensitive material in the electrode material is 1-10% based on 100% of the mass of the electrode material;
preferably, the mass of the conductive agent accounts for 0.5-5% of the mass of the electrode material as 100%;
preferably, the mass ratio of the binder is 1-3% based on 100% of the mass of the electrode material.
3. The electrode material of claim 1 or 2, wherein the negative temperature coefficient thermally sensitive material comprises a thermally sensitive semiconducting ceramic material;
preferably, the heat-sensitive semiconductor ceramic material comprises any one of manganese oxide ceramic, nickel oxide ceramic, cobalt oxide ceramic or copper oxide ceramic or a combination of at least two of the same.
4. The electrode material according to any one of claims 1 to 3, wherein the negative temperature coefficient thermosensitive material has a particle size of 100 to 800 nm;
preferably, the median particle diameter of the electrode active material is 3 to 10 μm.
5. The electrode material according to any one of claims 1 to 4, wherein the conductive agent is selected from fibrous, tubular, wire-like or sheet-like conductive agents, preferably comprising any one or a combination of at least two of carbon fibers, carbon nanotubes or graphene;
preferably, the binder comprises any one of polyvinylidene fluoride, polytetrafluoroethylene, polypropylene, styrene butadiene rubber, styrene butadiene latex, polybutylene, polyacrylate or polybutylene ester or a combination of at least two of them.
6. The electrode material according to any one of claims 1 to 5, wherein the electrode active material is a positive electrode active material or a negative electrode active material;
preferably, the positive electrode active material includes any one of lithium iron phosphate, lithium cobaltate, lithium titanate, or nickel cobalt manganese or a combination of at least two of the foregoing;
preferably, the negative active material includes a graphite material.
7. The method for producing an electrode material according to any one of claims 1 to 6, characterized by comprising:
mixing an electrode active substance, a negative temperature coefficient thermosensitive material, a conductive agent, a binder and a solvent to obtain the electrode material.
8. The method for preparing the electrode material as claimed in claim 7, wherein the negative temperature coefficient thermosensitive material comprises a thermosensitive semiconductive ceramic material, and the method for preparing the thermosensitive semiconductive ceramic material comprises:
sintering the metal oxide to obtain a thermosensitive semiconductor ceramic material;
preferably, the metal oxide comprises any one of manganese oxide, nickel oxide, copper oxide or cobalt oxide or a combination of at least two thereof;
preferably, the sintering temperature is 1200-1400 ℃.
9. A lithium ion battery, characterized in that it comprises an electrode material according to any one of claims 1 to 6.
10. The lithium ion battery of claim 9, wherein the lithium ion battery is a lithium ion power battery.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115849892A (en) * | 2022-12-20 | 2023-03-28 | 肇庆市金龙宝电子有限公司 | Preparation method of NTC thermistor ceramic material with improved aging resistance |
| WO2023109363A1 (en) * | 2021-12-15 | 2023-06-22 | 宁德时代新能源科技股份有限公司 | Positive electrode sheet, secondary battery, battery module, battery pack, and electric apparatus |
| CN116580909A (en) * | 2023-06-07 | 2023-08-11 | 惠州市冠业新材料科技有限公司 | NTC negative temperature coefficient thermistor type coating for new energy battery and preparation method thereof |
| CN116705987A (en) * | 2023-08-04 | 2023-09-05 | 深圳市德兰明海新能源股份有限公司 | Negative plate, electrochemical device and preparation method of electrochemical device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023109363A1 (en) * | 2021-12-15 | 2023-06-22 | 宁德时代新能源科技股份有限公司 | Positive electrode sheet, secondary battery, battery module, battery pack, and electric apparatus |
| CN115849892A (en) * | 2022-12-20 | 2023-03-28 | 肇庆市金龙宝电子有限公司 | Preparation method of NTC thermistor ceramic material with improved aging resistance |
| CN115849892B (en) * | 2022-12-20 | 2024-02-09 | 肇庆市金龙宝电子有限公司 | Preparation method of NTC thermistor ceramic material capable of improving ageing resistance |
| CN116580909A (en) * | 2023-06-07 | 2023-08-11 | 惠州市冠业新材料科技有限公司 | NTC negative temperature coefficient thermistor type coating for new energy battery and preparation method thereof |
| CN116580909B (en) * | 2023-06-07 | 2024-02-06 | 惠州市冠业新材料科技有限公司 | NTC negative temperature coefficient thermistor type coating for new energy battery and preparation method thereof |
| CN116705987A (en) * | 2023-08-04 | 2023-09-05 | 深圳市德兰明海新能源股份有限公司 | Negative plate, electrochemical device and preparation method of electrochemical device |
| CN116705987B (en) * | 2023-08-04 | 2024-01-26 | 深圳市德兰明海新能源股份有限公司 | Negative plate, electrochemical device and preparation method of electrochemical device |
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