Aqueous binder for positive electrode of lithium ion battery and preparation method of aqueous binder

A water-based binder, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor electronic conductivity and ionic conductivity, low compaction density of pole pieces, and easy cracking of pole pieces. To achieve the effect of good dispersion characteristics, good suspension stability and excellent adhesion
CN114560973AActive Publication Date: 2022-05-31SHENZHEN YANYI NEW MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN YANYI NEW MATERIALS CO LTD
Publication Date
2022-05-31

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Abstract

The invention relates to a lithium ion battery positive electrode aqueous binder, which is characterized by being formed by copolymerizing an ethylenic bond type unsaturated monomer and a flexible aqueous emulsion, wherein the ethylenically unsaturated monomer comprises an ethylenically unsaturated carboxylic acid or an ethylenically unsaturated carboxylic acid anhydride, an ethylenically unsaturated nitrile monomer and an ethylenically unsaturated hydrophilic monomer which does not contain a nitrile group and a carboxyl group; and wherein the flexible aqueous emulsion comprises water and flexible polymer latex particles. The invention also relates to a preparation method of the aqueous binder for the positive electrode of the lithium ion battery. The positive electrode slurry prepared from the binder is good in viscosity stability, and the positive electrode plate prepared from the positive electrode slurry is high in peel strength and good in flexibility under high compaction density. In addition, the lithium ion battery prepared from the binder provided by the invention has high cycle capacity retention rate, namely high cycle performance.
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Description

Aqueous binder for lithium ion battery positive electrode and preparation method thereof technical field The invention belongs to lithium ion battery field, be specifically related to a kind of lithium ion battery positive electrode aqueous binder and preparation thereof method. Background technique In mobile electronics, electric vehicles and other cycle energy systems, lithium-ion batteries are the most promising mobile Dynamic energy storage products. Currently, the commonly used cathode binder in lithium-ion batteries is polyvinylidene fluoride (PVDF). However, PVDF itself has some disadvantages, for example, poor electronic and ionic conductivity, poor adhesion, degree of swelling in electrolyte higher, and with lithium metal, LixC 6 Exothermic reactions occur at higher temperatures, and there is a greater safety hazard. Furthermore, using The positive electrode slurry prepared by PVDF is sensitive to environmental humidity, and it is easy to cause poor...

Claims

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