Battery electrode binder

Abstract

The invention discloses a battery electrode binder, which is characterized in that the battery electrode binder comprises a first polymer and a second polymer, the first polymer is formed by firstly carrying out Michael addition reaction polymerization on bis (vinyl sulfuryl) propanol and 4, 4'-bis (sec-butylamino) diphenylmethane, and then grafting through chloromethyl methyl methyl carbonate; the second polymer is an addition polymer prepared from 2, 3, 4-trifluorocinnamic acid, allyl succinimido carbonate, (Z)-3-(6-fluoro-1H-indole-3-yl) acrylonitrile and 2-allyloxy phenoxy methyl ethyleneoxide through a copolymerization reaction, wherein the mass ratio of the first polymer to the second polymer is 1:(2-3). The battery electrode binder disclosed by the invention is excellent in comprehensive performance, good in electrochemical, chemical and thermal stability and relatively high in mechanical strength, binding power and elasticity, the structural stability of an electrode can be guaranteed, and the production and use processes are safe and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of electronic bonding materials, in particular to a battery electrode binder. Background technique [0002] In recent years, with the increasing popularity of new energy vehicles and the rapid development of electronic devices such as tablet computers, Bluetooth headsets, and smart phones, the development and progress of lithium-ion battery technology as the core of energy supply has been driven. Lithium-ion batteries have become the mainstream trend of current power battery development due to their high capacity, high cycle times, no memory effect, high energy density, long cycle life, environmental protection, wide temperature range, high rate performance and safety. With the development of science and technology and the further expansion of the scope of use, people have put forward higher requirements for lithium-ion batteries, such as requiring them to have higher energy density, faster charge and discha...

AI Technical Summary

Problems solved by technology

However, recent studies have found that polyvinylidene fluoride has poor adhesion and elasticity, and it is easy to cause the active material to separate from the conductive agent during the charging and discharging process of the battery, resulting in a rapid decline in battery capacity.

At the same time, the amount of polyvinylidene fluoride in the electrode is too much, and its own ability to conduct electrons and ions is poor, so it increases the conduction resistance of electrons and ions in the electrode.

In addition, this type of binder is different from the composition of the electrolyte (mainly carbonate), which reduces the compatibility with electrode materials and SEI films, and the organic solvents used in its preparation process are highly toxic and expensive

[0005] Chinese patent document (notification number: CN106675449B) discloses a high-safety negative electrode slurry binder for lithium ion batteries, which is made of raw materials such as sodium carboxymethyl cellulose, styrene-butadiene rubber, sodium alginate and binder additives , although the binder has good bonding performance, but the raw material of styrene-butadiene rubber will affect the energy efficiency of the battery

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