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Diaphragm and method for preparing composite electrode couple by utilizing diaphragm

A separator and adhesive technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of increasing the internal resistance of the battery, reducing the porosity of the separator, and entering the porous separator to block the pores, so as to reduce the possibility of being blocked, The effect of avoiding the possibility of direct contact forming an internal short circuit

Active Publication Date: 2012-05-02
BEIJING HAWAGA POWER STORAGE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, usually in the composite electrode pair, the electrode active material is directly coated on the porous diaphragm, and the electrode active material is easy to enter the porous diaphragm to block the pores, reduce the porosity of the diaphragm, and increase the internal resistance of the battery; at the same time, the more serious is It may lead to direct contact between the positive active material and the negative active material, causing an internal short circuit in the battery

Method used

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  • Diaphragm and method for preparing composite electrode couple by utilizing diaphragm
  • Diaphragm and method for preparing composite electrode couple by utilizing diaphragm
  • Diaphragm and method for preparing composite electrode couple by utilizing diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Preparation of diaphragm: PVDF (polyvinylidene fluoride), 4,4'-oxidized bisbenzenesulfonyl hydrazide (composed of polyvinylidene fluoride by mass percentage: 4,4'-oxidized bisbenzenesulfonyl hydrazide=10:90 ) mixed in NMP (N-methylpyrrolidone) to obtain a slurry, which is evenly coated on the surface coated with SiO 2 One side of the non-woven porous matrix of the inorganic nanoparticle layer is dried at 60-110°C; the same slurry is evenly coated on the other side of the porous matrix, and dried at 60-110°C to obtain a diaphragm. Mix PVDF adhesive, carbon black and modified lithium manganate (adhesive by mass percentage: carbon black: lithium manganate = 8:7:85) in NMP (N-methylpyrrolidone), and mix thoroughly to make a positive electrode slurry. Coat the slurry on one side of the above separator, and dry it at 60-110°C; mix PVDF, lithium titanate and carbon black (composition by mass percentage: lithium titanate:carbon black:adhesive=90:3:7) Mix it in NMP, mix thorou...

Embodiment 2

[0022] Preparation of diaphragm: SBR (styrene-butadiene rubber) and CMC (sodium carboxymethyl cellulose), 4,4'-oxidized bisbenzenesulfonyl hydrazide (composed by mass percentage as SBR: CMC: 4,4'-oxidized bis-benzenesulfonyl hydrazide) Benzenesulfonyl hydrazide=5:3:92) is mixed in deionized water to obtain a slurry, and the slurry is evenly coated on the surface coated with SiO 2 One side of the non-woven porous matrix of the inorganic nanoparticle layer is dried at 60-110°C; the same slurry is evenly coated on the other side of the porous matrix, and dried at 60-110°C to obtain a diaphragm. Mix SBR and CMC, carbon black and modified lithium manganate (composed of SBR and CMC mixed adhesive by mass percentage: carbon black: lithium manganate = 8: 7: 85) in deionized water, fully mix to make positive electrode slurry material. This slurry is coated on one side of above-mentioned septum, at 60~110 ℃ of oven dry; SBR and CMC, artificial graphite and carbon black (by mass percent...

Embodiment 3

[0024] Preparation of diaphragm: polyvinyl chloride and benzenesulfonyl hydrazide (composed of polyvinyl chloride: benzenesulfonyl hydrazide = 9: 91 by mass percentage) are mixed in DMSO (dimethyl sulfoxide) to obtain a slurry, and the slurry The slurry is evenly coated on one side of a polyolefin porous substrate with a thickness of 25 microns, and dried at 60-80°C; then the same slurry is evenly coated on the other side of the porous substrate, and dried at 60-80°C to prepare Got diaphragm. Mix PVDF adhesive, carbon black and modified lithium manganate (adhesive by mass percentage: carbon black: lithium manganate = 8:7:85) in NMP (N-methylpyrrolidone), and mix thoroughly to make a positive electrode slurry. Coat the slurry on one side of the above diaphragm and dry at 60-80°C; mix PVDF, artificial graphite and carbon black (composed of artificial graphite:carbon black:adhesive=90:3:7 by mass percentage) in In NMP (N-methylpyrrolidone), mix well to make a negative electrode...

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Abstract

The invention discloses a diaphragm and a method for preparing a composite electrode couple by utilizing the diaphragm, and belongs to the technical field of lithium ion batteries. The diaphragm comprises a porous substrate and nonporous or low-porosity coatings on the two surfaces of the porous substrate, wherein the nonporous or low-porosity coating is formed by a forming agent and a polymer adhesive; and the foaming agent may be one or more of an azo foaming agent, a nitroso compound foaming agent and a sulfonyl hydrazide foaming agent. In the method for preparing the composite electrode couple, the composite electrode couple is prepared by coating a cathode mixture comprising a cathode active material, a conductive agent and the adhesive on one surface of the diaphragm, coating an anode mixture comprising an anode active material, the conductive agent and the adhesive on the other surface of the diaphragm, and foaming the foaming agent. By the diaphragm and the method, the probability of forming internal short circuit by direct contact between the cathode active material and the anode active material in a composite electrode couple preparation process can be avoided or decreased.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a diaphragm and a method for preparing a composite electrode pair using the diaphragm. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, high working voltage, long cycle life, low self-discharge, and no memory effect, so they are widely used in mobile communications, notebook computers, etc. At present, lithium-ion batteries have attracted much attention as power batteries for electric vehicles. The preparation of high-voltage lithium-ion batteries by stacking electrodes in series is a better way to solve the safety and consistency problems of power batteries for electric vehicles. [0003] The proposal of the composite electrode pair is an ideal solution to solve the short circuit between adjacent battery cells in the high-voltage lithium-ion battery once the composite current collector that exists in the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M4/139
CPCY02E60/122Y02E60/10
Inventor 张萍陈永翀李彦菊王秋平
Owner BEIJING HAWAGA POWER STORAGE TECH
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