CN106356556B - A kind of lithium-ion-power cell with long service life and preparation method thereof - Google Patents
A kind of lithium-ion-power cell with long service life and preparation method thereof Download PDFInfo
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- CN106356556B CN106356556B CN201611103612.9A CN201611103612A CN106356556B CN 106356556 B CN106356556 B CN 106356556B CN 201611103612 A CN201611103612 A CN 201611103612A CN 106356556 B CN106356556 B CN 106356556B
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
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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
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
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- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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Abstract
The invention discloses a kind of lithium-ion-power cells with long service life, including positive plate and negative electrode tab；The positive plate includes plus plate current-collecting body and the anode sizing agent that its surface is arranged in；The anode sizing agent includes: nickle cobalt lithium manganate 98.65-99.18%；Single-walled carbon nanotube 0.02-0.05%；Kynoar 0.8-1.3%；The negative electrode tab includes negative current collector and the negative electrode slurry that its surface is arranged in；The negative electrode slurry includes: graphene and graphite composite material 97-97.4%；Sodium carboxymethylcellulose 1.3-1.5%；Butadiene-styrene rubber 1.3-1.5%.The security performance of the lithium-ion-power cell is high, and needle thorn experiment percent of pass is high, thermostabilization enhancing；And charge-discharge magnification is big, gravimetric specific power is big, and cycle performance is excellent, and the service life is long.The invention also discloses a kind of preparation methods of lithium-ion-power cell with long service life, and process is simple, highly effective and safe, strong operability.
Description
Technical field
The present invention relates to battery technology field more particularly to a kind of lithium-ion-power cell with long service life and its preparations
Method.
Background technique
Lithium-ion-power cell is the novel high-energy battery succeeded in developing in 20th century, because it is with energy height, cell voltage
High, the advantages that operating temperature range is wide, storage life is long, it has been widely used in military and civilian compact electric apparatus.
For lithium-ion-power cell, positive electrode can select trielement composite material.Ternary composite cathode material is with nickel
Salt, cobalt salt, manganese salt are raw material, and the ratio of nickel cobalt manganese can adjust according to actual needs, and the battery that ternary material does anode is opposite
It is higher in cobalt acid lithium battery safety.
But existing lithium-ion-power cell processing performance is unstable.Because ternary material is to the humidity of production environment
It is required that high, the phenomenon that being easy to appear retrogradation after slurry water suction, cause coated face density unstable, the product qualification rate of production is lower than
90%.Meanwhile the security performance and high power charging-discharging poor circulation of existing product, specific manifestation are as follows: pierced in battery needle real
In testing, percent of pass is low；The thermal stability of battery is poor, and thermal diffusion is easy to happen after internal short-circuit, leads to phenomenon on fire from explosion；Battery
Poor circulation, 1C fills 5C and lowerd in 1000 weeks；Power-performance is low, and for battery discharge platform down to 3.6V, gravimetric specific power is low
To 576Wh/Kg.
Summary of the invention
For overcome the deficiencies in the prior art, the first purpose of this invention be to provide a kind of lithium with long service life from
The security performance of sub- power battery, the battery is high, and needle thorn experiment percent of pass is high, thermostabilization enhancing；And charge-discharge magnification is big, weight
Specific power is big, and cycle performance is excellent, and the service life is long.
Second object of the present invention is to provide a kind of preparation method of lithium-ion-power cell with long service life, flow
Journey is simple, highly effective and safe, strong operability.
Of the invention first 's, mesh is implemented with the following technical solutions:
A kind of lithium-ion-power cell with long service life, including positive plate and negative electrode tab；The positive plate includes anode
Collector and the anode sizing agent that the plus plate current-collecting body surface is set；The anode sizing agent by percentage by weight with
Lower component is prepared: nickle cobalt lithium manganate 98.65-99.18%；Single-walled carbon nanotube 0.02-0.05%；Kynoar 0.8-
1.3%；The negative electrode tab includes negative current collector and the negative electrode slurry that the negative current collector surface is arranged in；The cathode slurry
Material is prepared by following components in percentage by weight: graphene and graphite composite material 97-97.4%；Carboxymethyl is fine
Tie up plain sodium 1.3-1.5%；Butadiene-styrene rubber 1.3-1.5%.
Preferably, in the nickle cobalt lithium manganate, the mass ratio of nickel, cobalt and manganese three is 1:1:1；The graphene and stone
The theoretical gram volume 400-450mAh/g of black composite material.
Preferably, in the positive plate, the surface density of the anode sizing agent is 220-250g/ ㎡, and compacted density is
3.45-3.65g/mm3。
Preferably, in the negative electrode tab, the surface density of the negative electrode slurry is 83-95g/ ㎡, compacted density 1.45-
1.6g/mm3。
Preferably, the plus plate current-collecting body is aluminium foil；The negative current collector is copper foil.
Preferably, the plus plate current-collecting body with a thickness of 12-16 μm；The negative current collector with a thickness of 8-10 μm.
Of the invention second 's, mesh is implemented with the following technical solutions:
A kind of preparation method of lithium-ion-power cell with long service life, comprising the following steps:
1) it prepares positive plate: three nickle cobalt lithium manganates, single-walled carbon nanotube and the Kynoar of formula ratio is placed in mixing
In machine, after being kneaded uniformly, the first solvent is added, continues to be kneaded, obtains anode sizing agent, then dispersed；Then, after dispersion
Anode sizing agent be sprayed on the surface of plus plate current-collecting body, dry, be compacted to get positive plate；
2) it prepares negative electrode tab: graphene and graphite composite material, the sodium carboxymethylcellulose of formula ratio is placed in mixing machine
In, after being kneaded uniformly, the second solvent and butadiene-styrene rubber is added, continues to be kneaded, obtains negative electrode slurry, then dispersed；Then,
Negative electrode slurry after dispersion is sprayed on the surface of negative current collector, is dried, is compacted to get negative electrode tab；
3) core, drying: respectively cutting the positive plate and the negative electrode tab, in addition takes battery diaphragm, then
Positive plate, negative electrode tab and battery diaphragm after cutting is wound into battery core；Then, it dries；
4) assembly, fluid injection: the battery core after drying is packed into default shell, electrolyte is then injected into, seals, obtain semi-finished product
Battery；
5) it post-processes: by semi-finished product battery successively through overactivation, chemical conversion, first time aging, screening, second of aging process
Afterwards to get the lithium-ion-power cell.
Preferably, in step 1), three nickle cobalt lithium manganates, single-walled carbon nanotube and the Kynoar of formula ratio are placed in
In double planetary mixer, under conditions of revolution speed is 25r/min, it is kneaded 40min；After the first solvent is added, in revolution speed
Degree is that 48r/min is kneaded 90min, obtains anode sizing agent under conditions of rotational velocity is 1700r/min；Anode sizing agent is placed in
Revolving speed is to be dispersed in the high speed disperser of 3500 ± 500r/min until viscosity reaches 6000 ± 1000mPa.s；Then,
Anode sizing agent after dispersion is sprayed on the surface of plus plate current-collecting body, so that the surface density of anode sizing agent is 220-250g/ ㎡, is obtained
To semi-finished product positive plate；Then, semi-finished product positive plate is dried to water content≤0.1%, anode sizing agent is dehydrated to form positive powder
Material；Finally, rolling, so that the compacted density of positive mix is 3.45-3.65g/mm3, rod is not glued with pole piece, doubling cannot be saturating
Light, do not lose powder subject to get positive plate；
In step 2), graphene and graphite composite material, the sodium carboxymethylcellulose of formula ratio are placed in double-planet and mixed
In conjunction machine, under conditions of revolution speed is 25r/min, it is kneaded 40min；After the first solvent and butadiene-styrene rubber is added, revolving
Speed is that 48r/min is kneaded 90min, obtains negative electrode slurry under conditions of rotational velocity is 1600r/min；Negative electrode slurry is set
In the high speed disperser that revolving speed is 3300 ± 500r/min, it is dispersed to until viscosity reaches 5000 ± 1000mPa.s；Then,
Negative electrode slurry after dispersion is sprayed on the surface of negative current collector, so that the surface density of negative electrode slurry is 83-95g/ ㎡, is obtained
To semi-finished product negative electrode tab；Then, semi-finished product negative electrode tab is dried to water content≤0.1%, negative electrode slurry is dehydrated to form negative electrode powder
Material；Finally, rolling, so that the compacted density of cathode powder is 1.45-1.6g/mm3, with pole piece not glue rod, do not lose powder subject to, i.e.,
Obtain negative electrode tab；
In step 3), battery core is placed in vacuum oven, circulate operation vacuumizes, inflated with nitrogen and toasts these three steps
13-20h, wherein temperature when baking is 85 ± 10 DEG C, and pressure is (- 40)-(- 90) MPa, be dried to the water content of battery core≤
200PPM；
It is 20-25 DEG C in temperature in step 4), under conditions of Lu Dian≤- 38 DEG C, the battery core after drying is packed into default
Shell；
In step 5), semi-finished product battery is placed in the environment of temperature is 35-45 DEG C after activating 36h, above arrives formation cabinet
On be melted into, after, by battery be placed in temperature be 40 ± 5 DEG C in the environment of aging 5 days, then to battery carry out voltage in
The battery core partial volume list charging voltage of resistance screening, spec battery is controlled in 3.6-3.9V；Then, in the environment of temperature is 40 ± 5 DEG C
Aging 5 days；Finally, being screened by matching machine, it is grouped according to voltage internal resistance class, by spec battery partial volume, then FQC
Battery after appearance full inspection is qualified, after OQC full inspection is qualified, shipment.
Preferably, first solvent and second solvent are N-Methyl pyrrolidone or deionized water.First is molten
Agent and the second solvent can vapor away during drying.
Preferably, the battery diaphragm is non-woven fabrics battery diaphragm, is had using battery diaphragm made of non-woven fabrics ventilative
The advantage that degree is high, porosity is high, temperature resistance ability is strong, 300 DEG C or more it is indeformable, do not burn.
Compared with prior art, the beneficial effects of the present invention are:
(1) lithium-ion-power cell with long service life provided by the present invention, anode have used novel single wall carbon to receive
Mitron is as conductive agent, and the specific surface area of single-walled carbon nanotube is 5 times bigger than multi-walled carbon nanotube, and light-weight, and purity is higher, leads
Electrical property is more preferable, and dispersion processing effect is more preferable, and adding proportion is few, can reduce 1/10 usage amount, has reduced costs；Together
When, using novel graphene and graphite composite material, (graphene is inserted into cathode by olefinic carbon material by distinctive manufacture craft
, can be effectively by graphene in conjunction with graphite-phase between graphitic carbon interlamellar spacing), graphene is attached on graphite, so that graphite
The high gram volume (400-450mAh/g) of alkene and excellent electric conductivity are not fully exerted, and solving graphene in industry cannot
The problem effectively used on cathode.In addition, the conductive black for playing electric action in cathode is cancelled, active matter ratio is mentioned
It rises, the reduction of surface density reduces the usage amount of SBR (butadiene-styrene rubber) binder in coating process, can preferably enhance conduction
Property, and promote active matter ratio and battery core comprehensive performance；Meanwhile because cathode has used the olefinic carbon material of Gao Rong, positive work
Property object has used the better nickle cobalt lithium manganate of comprehensive performance (1:1:1) material, and the safety of battery core, multiplying power and circularly enhancing are arrived
New height, comprehensive performance is well beyond requirements of the national standard.
(2) lithium-ion-power cell with long service life provided by the present invention can pass through " GB/T 31485-2015
Power accumulator safety requirements for electric vehicle and test method " related request, comprising: overcharge, short circuit, is fallen at overdischarge
It falls, heat, squeezing, needle thorn, seawater immersion, temperature cycles, the safety tests requirement such as low pressure；The cycle performance 1C of the battery fills
10C puts circulation 1500 weeks, capacity retention ratio > 80%, and low gravimetric specific power is 2880WH/Kg；And current battery 1C fills 5C puts
Circulation 1000 weeks, capacity retention ratio < 80%, low gravimetric specific power is 576WH/Kg.
(3) preparation method of lithium-ion-power cell with long service life provided by the present invention, process is simple, efficiently pacifies
Entirely, strong operability.
Specific embodiment
In the following, being described further in conjunction with specific embodiment to the present invention:
Graphene selected by the embodiment of the present invention and graphite composite material (olefinic carbon) can be obtained from purchase on the market, be had
Body is the TQ series olefinic carbon from Ningbo Guo Yuan new material Science and Technology Ltd..
A kind of lithium-ion-power cell with long service life, including positive plate and negative electrode tab；The positive plate includes anode
Collector and the anode sizing agent that the plus plate current-collecting body surface is set；The anode sizing agent by percentage by weight with
Lower component is prepared: nickle cobalt lithium manganate 98.65-99.18%；Single-walled carbon nanotube 0.02-0.05%；Kynoar 0.8-
1.3%；The negative electrode tab includes negative current collector and the negative electrode slurry that the negative current collector surface is arranged in；The cathode slurry
Material is prepared by following components in percentage by weight: graphene and graphite composite material 97-97.4%；Carboxymethyl is fine
Tie up plain sodium 1.3-1.5%；Butadiene-styrene rubber 1.3-1.5%.
A kind of preparation method of lithium-ion-power cell with long service life, comprising the following steps:
1) it prepares positive plate: three nickle cobalt lithium manganates, single-walled carbon nanotube and the Kynoar of formula ratio is placed in mixing
In machine, after being kneaded uniformly, the first solvent is added, continues to be kneaded, obtains anode sizing agent, then dispersed；Then, after dispersion
Anode sizing agent be sprayed on the surface of plus plate current-collecting body, dry, be compacted to get positive plate；
2) it prepares negative electrode tab: graphene and graphite composite material, the sodium carboxymethylcellulose of formula ratio is placed in mixing machine
In, after being kneaded uniformly, the second solvent and butadiene-styrene rubber is added, continues to be kneaded, obtains negative electrode slurry, then dispersed；Then,
Negative electrode slurry after dispersion is sprayed on the surface of negative current collector, is dried, is compacted to get negative electrode tab；
3) core, drying: respectively cutting the positive plate and the negative electrode tab, in addition takes battery diaphragm, then
Positive plate, negative electrode tab and battery diaphragm after cutting is wound into battery core；Then, it dries；
4) assembly, fluid injection: the battery core after drying is packed into default shell, electrolyte is then injected into, seals, obtain semi-finished product
Battery；
5) it post-processes: by semi-finished product battery successively through overactivation, chemical conversion, first time aging, screening, second of aging process
Afterwards to get the lithium-ion-power cell.
Embodiment 1
A kind of lithium-ion-power cell with long service life, is successively prepared according to the following steps:
1) positive plate is prepared: in percentage by weight nickle cobalt lithium manganate (nickel cobalt manganese ratio 1:1:1) 98.65%, list
Wall carbon nano tube 0.05% and Kynoar (PVDF) 1.3% are placed in double planetary mixer, are 25r/min in revolution speed
Under conditions of, make 40min；Then solvent is added, in the condition that revolution speed is 48r/min, rotational velocity is 1700r/min
Under, 90min is made, slurry is made, then dispersed under the revolving speed of 3500 ± 500r/min with high speed disperser, until viscosity
Reach 6000 ± 1000mPa.s；Then, anode sizing agent is coated in thickness according to the surface density of 220-250g/ ㎡ with spraying equipment
Degree is on 12-16 μm of aluminium foil, pole piece (water content≤0.1%) is made in drying；Then it rolls, the compacting of active material is made
Density is 3.45-3.65g/mm3Positive plate, rod is not glued with pole piece, subject to doubling is unable to light transmission, does not lose powder；
2) negative electrode tab is prepared: in percentage by weight olefinic carbon (graphene and graphite composite material) 97.4% and carboxylic first
Base sodium cellulosate (CMC) 1.3% is placed in double planetary mixer, under conditions of revolution speed is 25r/min, makes 40min；
Then solvent and butadiene-styrene rubber (SBR) 1.3% is added, in the item that revolution speed is 48r/min, rotational velocity is 1600r/min
Under part, 90min is made, slurry is made, then dispersed under the revolving speed of 3300 ± 500r/min with high speed disperser, until viscous
Degree reaches 5000 ± 1000mPa.s；Then, negative electrode slurry is coated in thickness according to the surface density of 83-95g/ ㎡ with spraying equipment
Degree is on 8-10 μm of copper foil, pole piece (water content≤0.1%) is made in drying；Then it rolls, the compacted density of active matter is made
For 1.45-1.6g/mm3Negative electrode tab, the not viscous rod of pole piece of being subject to do not lose powder；
3) core, drying: positive plate and negative electrode tab are cut according to the specification of default shell respectively, separately take non-woven fabrics
Then positive plate, negative electrode tab and battery diaphragm after cutting is wound into battery core by battery diaphragm；Then, it is put into vacuum oven, is led to
It crosses and vacuumizes, inflated with nitrogen, constant temperature and pressure toasts (85 ± 10 DEG C, -40 to -90MPa) three steps and recycles 13-20h, by the water in core
Part content is reduced to≤200PPM；
4) assembly, fluid injection: it is 20-25 DEG C in environment temperature, under conditions of Lu Dian≤- 38 DEG C, battery core is entered into shell, then
And electrolyte is injected, it seals；
5) post-process: by battery core in the environment of temperature is 35-45 DEG C after activation 36h, on to being melted on formation cabinet,
After, by battery core first aging 5 days in the environment of temperature is 40 ± 5 DEG C, voltage internal resistance screening then is carried out to battery core, it is qualified
Battery core partial volume list charging voltage is controlled in 3.6-3.9V；Then, aging 5 days in the environment of temperature is 40 ± 5 DEG C, then by matching
Group machine screening battery core is at different voltages internal resistance class, finally by qualified battery core partial volume, battery core of the FQC appearance full inspection after qualified,
By OQC full inspection, after qualified, shipment.
The lithium-ion-power cell of embodiment 1 is tested for the property, test method is according to " GB/T 31485-2015 electricity
Electrical automobile is with power accumulator safety requirements and test method " it carries out.The result shows that the lithium-ion-power cell of embodiment 1 is pacified
Full performance is high, absolutely passes through in needle thorn experiment, thermal stability is good；Cycle performance is excellent, and 1C, which fills 10C, to be put more than 1500 weeks,
Gravimetric power is reached for 2880WH/Kg.
Embodiment 2
Embodiment 2 difference from example 1 is that:
Anode sizing agent is prepared by following components in percentage by weight: nickle cobalt lithium manganate (nickel cobalt manganese ratio 1:
1:1) 99%, single-walled carbon nanotube 0.03%, Kynoar (PVDF) 0.97%；
Negative electrode slurry is prepared by following components in percentage by weight: olefinic carbon (graphene and graphite composite wood
Material) 97%, sodium carboxymethylcellulose (CMC) 1.5%, butadiene-styrene rubber (SBR) 1.5%.
The lithium-ion-power cell of embodiment 2 is tested for the property, test method is according to " GB/T 31485-2015 electricity
Electrical automobile is with power accumulator safety requirements and test method " it carries out.The result shows that the lithium-ion-power cell of embodiment 2 is pacified
Full performance is high, absolutely passes through in needle thorn experiment, thermal stability is good；Cycle performance is excellent, and 1C, which fills 10C, to be put more than 1500 weeks,
Gravimetric power is reached for 2880WH/Kg.
Comparative example 1
Comparative example 1 difference from example 1 is that:
Anode sizing agent is prepared by following components in percentage by weight: nickle cobalt lithium manganate 95.5%, carbon nanometer
Manage (CNT) 1%, electrically conductive graphite 1.5%, Kynoar (PVDF) 2%；
Negative electrode slurry is prepared by following components in percentage by weight: graphite 95.5%, conductive black 1%,
Sodium carboxymethylcellulose (CMC) 1.5%, butadiene-styrene rubber (SBR) 2%.
The lithium-ion-power cell of comparative example 1 is tested for the property, test method is according to " GB/T 31485-2015 electricity
Electrical automobile is with power accumulator safety requirements and test method " it carries out.The result shows that the lithium-ion-power cell of comparative example 1,
Needle thorn experiment in cannot very pass through, and carry out high rate charge-discharge test when, the calorific value of battery core is big, cycle performance compared with
Difference.
It will be apparent to those skilled in the art that can make various other according to the above description of the technical scheme and ideas
Corresponding change and deformation, and all these changes and deformation all should belong to the protection scope of the claims in the present invention
Within.
Claims (9)
1. a kind of lithium-ion-power cell with long service life, which is characterized in that including positive plate and negative electrode tab；
The positive plate includes plus plate current-collecting body and the anode sizing agent that the plus plate current-collecting body surface is arranged in；The anode sizing agent
It is prepared by following components in percentage by weight: nickle cobalt lithium manganate 98.65-99.18%；Single-walled carbon nanotube 0.02-
0.05%；Kynoar 0.8-1.3%；
The negative electrode tab includes negative current collector and the negative electrode slurry that the negative current collector surface is arranged in；The negative electrode slurry
It is prepared by following components in percentage by weight: graphene and graphite composite material 97-97.4%；Carboxymethyl cellulose
Plain sodium 1.3-1.5%；Butadiene-styrene rubber 1.3-1.5%；
In the nickle cobalt lithium manganate, the mass ratio of nickel, cobalt and manganese three is 1:1:1；The graphene and graphite composite material
Theoretical gram volume 400-450mAh/g.
2. lithium-ion-power cell with long service life according to claim 1, which is characterized in that in the positive plate
In, the surface density of the anode sizing agent is 220-250g/ ㎡, compacted density 3.45-3.65g/mm3.
3. lithium-ion-power cell with long service life according to claim 1, which is characterized in that in the negative electrode tab
In, the surface density of the negative electrode slurry is 83-95g/ ㎡, compacted density 1.45-1.6g/mm3.
4. lithium-ion-power cell with long service life according to claim 1, which is characterized in that the plus plate current-collecting body
For aluminium foil；The negative current collector is copper foil.
5. lithium-ion-power cell with long service life according to claim 1, which is characterized in that the plus plate current-collecting body
With a thickness of 12-16 μm；The negative current collector with a thickness of 8-10 μm.
6. a kind of preparation method of the lithium-ion-power cell with long service life as described in claim 1-5 any one,
It is characterized in that, comprising the following steps:
1) it prepares positive plate: three nickle cobalt lithium manganates, single-walled carbon nanotube and the Kynoar of formula ratio is placed in mixing machine,
After being kneaded uniformly, the first solvent is added, continues to be kneaded, obtains anode sizing agent, then dispersed；Then, after dispersion just
Pole slurry is sprayed on the surface of plus plate current-collecting body, and drying is compacted to get positive plate；
2) it prepares negative electrode tab: graphene and graphite composite material, the sodium carboxymethylcellulose of formula ratio is placed in mixing machine, mix
After refining uniformly, the second solvent and butadiene-styrene rubber is added, continues to be kneaded, obtains negative electrode slurry, then dispersed；Then, point
Negative electrode slurry after dissipating is sprayed on the surface of negative current collector, is dried, and is compacted to get negative electrode tab；
3) core, drying: respectively cutting the positive plate and the negative electrode tab, in addition takes battery diaphragm, then will cut out
Positive plate, negative electrode tab and battery diaphragm after cutting are wound into battery core；Then, it dries；
4) assembly, fluid injection: the battery core after drying is packed into default shell, electrolyte is then injected into, seals, obtain semi-finished product cell
Pond；
5) it post-processes: by semi-finished product battery successively after overactivation, chemical conversion, first time aging, screening, second of aging process,
Up to the lithium-ion-power cell.
7. the preparation method of lithium-ion-power cell with long service life according to claim 6, which is characterized in that in step
It is rapid 1) in, three nickle cobalt lithium manganates, single-walled carbon nanotube and the Kynoar of formula ratio are placed in double planetary mixer, in public affairs
Under conditions of rotary speed is 25r/min, it is kneaded 40min；It is 48r/min, rotational velocity in revolution speed after the first solvent is added
Under conditions of 1700r/min, it is kneaded 90min, obtains anode sizing agent；It is 3500 ± 500r/min that anode sizing agent, which is placed in revolving speed,
High speed disperser in, be dispersed to until viscosity reaches 6000 ± 1000mPa.s；Then, the anode sizing agent after dispersion is sprayed
In on the surface of plus plate current-collecting body, so that the surface density of anode sizing agent is 220-250g/ ㎡, semi-finished product positive plate is obtained；Then,
Semi-finished product positive plate is dried to water content≤0.1%, anode sizing agent is dehydrated to form positive mix；Finally, rolling, so that positive
The compacted density of powder is 3.45-3.65g/mm3 to get positive plate；
In step 2, graphene and graphite composite material, the sodium carboxymethylcellulose of formula ratio are placed in double planetary mixer
In, under conditions of revolution speed is 25r/min, it is kneaded 40min；After the first solvent and butadiene-styrene rubber is added, in revolution speed
It is kneaded 90min, obtains negative electrode slurry under conditions of rotational velocity is 1600r/min for 48r/min；Negative electrode slurry is placed in and is turned
Speed is to be dispersed in the high speed disperser of 3300 ± 500r/min until viscosity reaches 5000 ± 1000mPa.s；Then, point
Negative electrode slurry after dissipating is sprayed on the surface of negative current collector, so that the surface density of negative electrode slurry is 83-95g/ ㎡, obtains half
Finished product negative electrode tab；Then, semi-finished product negative electrode tab is dried to water content≤0.1%, negative electrode slurry is dehydrated to form cathode powder；Most
Afterwards, it rolls, so that the compacted density of cathode powder is 1.45-1.6g/mm3 to get negative electrode tab；
In step 3), battery core is placed in vacuum oven, circulate operation vacuumizes, inflated with nitrogen and toasts these three steps 13-
20h, wherein temperature when baking is 85 ± 10 DEG C, and pressure is (- 40)-(- 90) MPa, be dried to the water content of battery core≤
200PPM；
It is 20-25 DEG C in temperature in step 4), under conditions of Lu Dian≤- 38 DEG C, the battery core after drying is packed into default shell
Body；
In step 5), semi-finished product battery is placed in the environment of temperature is 35-45 DEG C after activating 36h, it is enterprising above to arrive formation cabinet
Row chemical conversion, after, battery is placed in the environment of temperature is 40 ± 5 DEG C aging 5 days, voltage internal resistance sieve then is carried out to battery
The battery core partial volume list charging voltage of choosing, spec battery is controlled in 3.6-3.9V；Then, the aging 5 in the environment of temperature is 40 ± 5 DEG C
It.
8. the preparation method of lithium-ion-power cell with long service life according to claim 6, which is characterized in that described
First solvent and second solvent are N-Methyl pyrrolidone or deionized water.
9. the preparation method of lithium-ion-power cell with long service life according to claim 6, which is characterized in that described
Battery diaphragm is non-woven fabrics battery diaphragm.
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| CN107681157A (en) * | 2017-08-08 | 2018-02-09 | 广州鹏辉能源科技股份有限公司 | A kind of lithium ion battery conductive agent and its lithium ion battery |
| CN108155340A (en) * | 2017-12-12 | 2018-06-12 | 江苏双登富朗特新能源有限公司 | The external conductive layer component of commercial lithium-ion battery plus plate current-collecting body and preparation method |
| CN108400333A (en) * | 2018-01-19 | 2018-08-14 | 广西卓能新能源科技有限公司 | A kind of high energy lithium ion cell and preparation method thereof |
| CN112186180A (en) * | 2020-09-08 | 2021-01-05 | 合肥国轩高科动力能源有限公司 | Negative electrode slurry for improving cycle performance of lithium ion battery |
| CN112151756A (en) * | 2020-09-14 | 2020-12-29 | 江苏塔菲尔新能源科技股份有限公司 | Negative plate and battery |
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