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Lithium ion battery waterborne positive electrode composite collector, positive plate, manufacturing methods for lithium ion battery waterborne positive electrode composite collector and positive plate, and lithium ion battery

A lithium-ion battery and current collector technology, which is applied in the direction of electrode collector coating, electrode carrier/current collector, electrode manufacturing, etc., can solve the problems of poor flexibility of the positive electrode sheet, cracks on the surface of the electrode sheet, etc., and reduce the internal resistance of the battery , small internal resistance, good flexibility

Active Publication Date: 2016-01-20
CALB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the flexibility of the positive electrode sheet is poor, and it is easy to cause cracks on the surface of the electrode sheet during subsequent processing.

Method used

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  • Lithium ion battery waterborne positive electrode composite collector, positive plate, manufacturing methods for lithium ion battery waterborne positive electrode composite collector and positive plate, and lithium ion battery
  • Lithium ion battery waterborne positive electrode composite collector, positive plate, manufacturing methods for lithium ion battery waterborne positive electrode composite collector and positive plate, and lithium ion battery
  • Lithium ion battery waterborne positive electrode composite collector, positive plate, manufacturing methods for lithium ion battery waterborne positive electrode composite collector and positive plate, and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The lithium-ion battery aqueous cathode composite current collector of this embodiment is prepared by a preparation method comprising the following steps:

[0042] 1) Add 1 kg of binder polyvinylidene fluoride (PVDF) into 20 kg of solvent N-methylpyrrolidone, and mix evenly to obtain a binder solution;

[0043] 2) Add 9kg of conductive agent SuperP to the binder solution prepared in step 1), mix well, grind and emulsify at a speed of 1000rpm with a grinding ball of 0.4mm particle size for 2h, remove foam for 8h, and pass through a 200-mesh sieve Net, get conductive paste;

[0044] 3) Use a gravure printing machine to evenly coat the conductive paste prepared in step 2) on both surfaces of the positive electrode current collector aluminum foil, the thickness of the aluminum foil is 20 μm, and the coating surface density is 2g / m 2 , dried at 120 ° C, that is, too.

[0045] Such as figure 1 As shown, the positive electrode sheet of this embodiment includes the above-men...

Embodiment 2

[0050] The lithium-ion battery aqueous cathode composite current collector of this embodiment is prepared by a preparation method comprising the following steps:

[0051] 1) Add 200g of binder carboxymethylcellulose sodium (CMC) into 15kg of solvent deionized water, mix evenly, then add 1.4kg of polyvinyl alcohol, mix evenly, and obtain a binder solution;

[0052] 2) Add 2.4kg of conductive agent SuperP to the binder solution prepared in step 1), mix well, grind and emulsify at a speed of 1000rpm with 0.6mm grinding balls for 2h, defoam for 8h, pass through 200 mesh screen to obtain conductive paste;

[0053] 3) Use a gravure printing machine to evenly coat the conductive paste prepared in step 2) on both surfaces of the positive electrode current collector aluminum foil, the thickness of the aluminum foil is 10 μm, and the coating surface density is 1 g / m 2 , dried at 70 ° C, that is, too.

[0054] The positive electrode sheet of this embodiment includes the above-mentioned...

Embodiment 3

[0059] The lithium-ion battery aqueous cathode composite current collector of this embodiment is prepared by a preparation method comprising the following steps:

[0060] 1) Add 200g of binder sodium carboxymethylcellulose (CMC) into 15kg of solvent deionized water, mix evenly, then add 1.4kg of styrene-butadiene rubber (SBR), mix evenly, and obtain a binder solution;

[0061] 2) Add a mixed conductive agent mixed with 800g SuperP and 1600g graphene to the binder solution prepared in step 1), mix evenly, and grind and emulsify for 2h at a speed of 1000rpm with a grinding ball with a particle size of 0.3mm, except Soak for 8 hours, pass through a 200-mesh sieve to obtain conductive paste;

[0062] 3) Apply the conductive paste prepared in step 2) evenly on both surfaces of the positive electrode current collector aluminum foil with a gravure printing machine, the thickness of the aluminum foil is 25 μm, and the coating surface density is 1 g / m 2 , dried at 70 ° C, that is, too...

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Abstract

The invention relates to a lithium ion battery waterborne positive electrode composite collector, a positive plate, manufacturing methods for the lithium ion battery waterborne positive electrode composite collector and the positive plate, and the lithium ion battery, and belongs to the technical field of lithium ion batteries. The lithium ion battery waterborne positive electrode composite collector is prepared by the following steps of adding a binder into a solvent to uniformly mix to obtain a binder solution, wherein the mass ratio of the binder to the solvent is 1:10-30; adding a conductive agent to the binder solution, uniformly mixing, grinding and emulsifying to obtain a conducive slurry, wherein the mass ratio of the conductive agent to the binder is 1-99:1; and coating the surface of the positive electrode collector with the prepared conductive slurry, and drying to obtain the lithium ion battery waterborne positive electrode composite collector. The problem of low flexibility of the waterborne positive plate is greatly solved by the lithium ion battery waterborne positive electrode composite collector; and meanwhile, the adhesive force of the coating layer is improved, the internal resistance of the battery is reduced, and the high-rate discharge performance and the cycle performance of the battery are improved.

Description

technical field [0001] The invention relates to a lithium-ion battery water-based positive electrode composite current collector, a positive electrode sheet and a preparation method thereof, and a lithium-ion battery, belonging to the technical field of lithium-ion batteries. Background technique [0002] Lithium-ion batteries have the characteristics of high working voltage, high energy density, long cycle life, small self-discharge, no memory effect, and environmental friendliness. At present, they have become ideal power sources for communications, electric tools, electric vehicles, aerospace and other fields. [0003] The production process of the pole piece of the lithium-ion battery is to first bond the binder with the active material and the conductive agent to form a slurry with a suitable viscosity, and then make the pole piece through filtration, coating, drying and other processes. The pole piece is divided into a positive pole piece and a negative pole piece. Acc...

Claims

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Application Information

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IPC IPC(8): H01M4/64H01M4/13H01M10/04H01M10/0525
CPCH01M4/0404H01M4/13H01M4/66H01M4/665H01M10/04H01M10/0525Y02E60/10Y02P70/50
Inventor 王海文张国军李亚玲怀永建张海峰白莉贾海
Owner CALB CO LTD
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