Polyindole crosslinked polyvinylidene fluoride binder and lithium ion battery applying the same

A technology of polyvinylidene fluoride and lithium-ion batteries, which is applied in the manufacture of battery electrodes, non-aqueous electrolyte batteries, and electrolyte batteries. resistance, reduce capacity, and improve performance

Inactive Publication Date: 2016-02-24
百顺松涛(天津)动力电池科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem to be solved by the present invention is: to overcome the deficiencies of the prior art, to provide a polybenzazole cross-linked polyvinylidene fluoride binder, which can solve the problem of high internal resistance of the lithium battery caused by the high dielectric constant of the binder. Practical problems such as discharge capacity and high temperature during discharge

Method used

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  • Polyindole crosslinked polyvinylidene fluoride binder and lithium ion battery applying the same
  • Polyindole crosslinked polyvinylidene fluoride binder and lithium ion battery applying the same
  • Polyindole crosslinked polyvinylidene fluoride binder and lithium ion battery applying the same

Examples

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preparation example Construction

[0037] The preparation method of polyvinylidene fluoride binder comprises the steps:

[0038] (1) Pour 5kg of polyvinylidene fluoride into 95kg of N-methylpyrrolidone, and stir while adding. The adding time is 0.5h, and the overall stirring time is 4h. Use a double-star vacuum mixer with a revolution speed of 35-50rpm and a dispersion speed 800-1000rpm, maintain the temperature at 40-60°C, vacuum -0.1MPa after the stirring is completed, and maintain the pressure for 0.5h to obtain the mixed colloid B0.

[0039] The preparation method of the lithium-ion battery using above-mentioned binding agent, comprises the steps:

[0040] (1) Preparation of positive and negative electrode slurry:

[0041] Preparation of positive electrode slurry: Weigh 95.5kg ternary nickel-cobalt lithium manganate, 50kg mixed colloid B0, 1kgSuper-P and 1kgKS-6 graphite conductive agent, ternary nickel-cobalt lithium manganate: mixed colloid B0: Super-P: KS-6 graphite conductive agent = 95.5:50:1:1, firs...

Embodiment 1

[0047] A polybenzazole crosslinked polyvinylidene fluoride binder, the binder is crosslinked and polymerized by polybenzazole and polyvinylidene fluoride, and the mass ratio of polybenzazole to polyvinylidene fluoride is 2:8.

[0048] A preparation method of polybenzazole crosslinked polyvinylidene fluoride binder, comprising the steps of:

[0049] (1) Pre-mix 1 kg of polybenzazole and 4 kg of polyvinylidene fluoride with a three-dimensional mixer for 3-4 hours, and the mass ratio of polybenzazole to polyvinylidene fluoride is 2:8 to obtain mixed powder A1.

[0050] (2) After cooling 5kg of mixed powder A1 to room temperature (25°C), pour it into 57.5kg of N-methylpyrrolidone, and stir while adding. The addition time is 0.5h, and the overall stirring time is 4h. Use a double-star vacuum mixer, The revolution speed is 35-50rpm, the dispersion speed is 800-1000rpm, and the temperature is maintained at 40-60°C. After the stirring is completed, the vacuum is -0.1MPa, and the press...

Embodiment 2

[0062] A polybenzazole crosslinked polyvinylidene fluoride binder, the binder is crosslinked and polymerized by polybenzazole and polyvinylidene fluoride, and the mass ratio of polybenzazole to polyvinylidene fluoride is 5:5.

[0063] A preparation method of polybenzazole crosslinked polyvinylidene fluoride binder, comprising the steps of:

[0064] (1) Premix 2.5kg of polybenzazole and 2.5kg of polyvinylidene fluoride with a three-dimensional mixer for 3-4 hours, the mass ratio of polybenzazole to polyvinylidene fluoride is 4:6, and obtain mixed powder A2.

[0065] (2) After cooling 5kg of mixed powder A2 to room temperature (25°C), pour it into 57.5kg of N-methylpyrrolidone, and stir while adding. The addition time is 0.5h, and the overall stirring time is 4h. Use a double-star vacuum mixer, The revolution speed is 35-50rpm, the dispersion speed is 800-1000rpm, and the temperature is maintained at 40-60°C. After the stirring is completed, the vacuum is -0.1MPa, and the pressu...

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Abstract

Belonging to the technical field of lithium ion batteries, the invention provides a polyindole crosslinked polyvinylidene fluoride binder. The binder is formed by crosslinking polymerization of polyindole and polyvinylidene fluoride. The preparation method of the polyindole crosslinked polyvinylidene fluoride binder comprises the steps of: (1) premixing polyindole with polyvinylidene fluoride to obtain mixed powder A; (2) pouring the mixed powder A into N-methyl pyrrolidone under stirring, then conducting vacuum pumping, maintaining the pressure to obtain mixed colloid B; (3) adding a coupling agent into the colloid B and performing stirring to obtain mixed colloid C; (4) weighing crosslinking agent diisocyanate and N-methyl pyrrolidone, performing stirring at room temperature to obtain a solution D; and (5) adding the solution D rapidly into the mixed colloid C, and conducting stirring to obtain the binder F. The invention also provides a lithium ion battery applying the binder. The invention can solve the actual problems that the high battery internal resistance caused by high dielectric constant of the binder can affect the discharge capacity, the discharge temperature is high and the like.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a polybenzazole cross-linked polyvinylidene fluoride binder and a lithium ion battery using the binder. Background technique [0002] The binders widely used in lithium battery production include polyvinylidene fluoride, sodium carboxymethyl cellulose and polystyrene propylene rubber. A large amount occupies a large proportion of the components in the lithium battery, which affects the performance of the capacity, and due to the high dielectric constant affects the internal resistance of the lithium battery, the discharge capacity, and the temperature during discharge. In addition to cohesiveness, this cross-linked binder also has electronic conductivity, and the redox characteristics of the conductive binder itself can not only play the role of bonding but also conduct electricity in the positive and negative electrodes of lithium-ion batteries. The role of reducing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/058
CPCH01M4/623H01M10/058Y02E60/10Y02P70/50
Inventor 王卿
Owner 百顺松涛(天津)动力电池科技发展有限公司
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