A kind of polyimide binder and preparation method thereof, silicon carbon negative plate

Abstract

The invention discloses a polyimide binder, which is prepared by copolymerization of benzimidazole polyamic acid salt and polyamide salt, wherein the weight ratio of benzimidazole polyamic acid salt to polyamide salt is 8-9: 1‑2; the synthetic raw materials of benzimidazole polyamic acid salt include: diamine monomers and tetracarboxylic dianhydride monomers containing benzimidazole group structures; the synthetic raw materials of polyamide salts include: diacid monomers and Water soluble diamine monomer. The invention also discloses a preparation method of the polyimide binder. The invention also discloses a silicon carbon negative plate. The invention has good adhesion performance, can improve the expansion problem of the silicon-carbon negative electrode, and improve the cycle performance of the battery.

Description

A kind of polyimide binder and preparation method thereof, and silicon carbon negative electrode sheet technical field The present invention relates to adhesive technical field, relate in particular to a kind of polyimide adhesive and preparation method thereof, silicon carbon Negative sheet. Background technique In recent years, due to the increasingly serious environmental problems and the unavoidable energy crisis, people have The demand for cars is increasing. Therefore, energy storage devices applied to electric vehicles have attracted much attention. Lithium-ion batteries have working power High pressure, high energy density, small size, no memory effect and many other advantages, occupy a variety of mobile electronic devices and electric vehicles dominance in the field. However, its energy density can no longer meet the high requirements for energy storage of new energy electric vehicles in the future. [0003] The silicon-based negative electrode has a goo...

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Problems solved by technology

The traditional binder polyvinylidene fluoride (PVDF) has high cost, poor environmental friendliness, and weak interaction with active materials, so it is not suitable for anode materials with large volume effects such as silicon.

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