Acetic acid vinyl ester-acrylic ester copolymer basis solid polymer electrolyte and film

Abstract

The invention discloses a solid polymer electrolyte with same structure and different composite and electrolytic film, which is characterized by the following: setting the electrolytic polymer base as random copolymer of vinyl acetate VAc with feeding mole ratio at 8. 5 : 1. 5-1. 5 : 8. 5 and acrylic ester MA, MMA, EA, BA and so on; and setting as vinyl acetate-acrylic ester polymer and second polymer; setting polymer blending base as PMMA, PVdF and so on; adopting semi-continuous seed emulsion polymeric method synthesis; mixing and stirring synthetic vinyl acetate-acrylic ester random copolymer base, second polymer and Li salt under the function of the solvent evenly; getting mixed solution; casting into die; pressing; fetching film; drying; getting the product. This invention possesses better mechanical force property, hot stability and higher light transmittance ratio, which can be used to twice Li battery.

Description

Technical field

[0001] The invention relates to a polymer electrolyte material, in particular to a comonomer using vinyl acetate and acrylic esters, such as methyl acrylate MA, methyl methacrylate MMA, ethyl acrylate EA, butyl acrylate BA, etc. The synthetic random copolymer and the blend of the copolymer and the second polymer, such as PMMA, PVdF, etc., are used as the solid polymer electrolyte of the polymer matrix. The solid polymer electrolyte produced by the present invention is usually used in the form of a polymer electrolyte membrane. The vinyl acetate-acrylate copolymer, the second polymer, the lithium salt and the solvent are mixed and stirred uniformly, and then cast into a film to obtain a solid polymer electrolyte membrane. The solid polymer electrolyte produced by the invention has the characteristics of high ionic conductivity, good film-forming properties, high light transmittance, and excellent mechanical properties. It is expected to be used in lithium ion second...