PREPARATION METHOD FOR FLAME-RETARDANT LITHIUM ION BATTERY ELECTROLYTE EASY TO DISSOLVE IN ORGANIC SOLVENT

摘要

A lithium salt easy to dissolve in an organic solvent and having a flame-retardant function, and a flame-retardant electrolyte of a lithium ion battery having same. The lithium salt is poly(lithium phosphate)phosphazene partially substituted by (alkylaroxy), and the structural general formula of the lithium salt is: [(R-Ar-O)_x(P=N)_n(Li₂O₃P)_2n-x]. The novel flame-retardant electrolyte is formed by compounding the lithium salt and a phosphate ester intermediate [(R-Ar-O)_x(P=N)_n(R'₂O₃P)_2n-x] of the lithium salt according to a mass ratio of 10:1-1:1. The electrolyte is easy to dissolve in an organic solvent. The electrolyte is prepared according to the amount of 8-45%, and thus the novel flame-retardant electrolyte can be obtained. The electrolyte has good lithium ion conductivity and good flame-retardant performance, and is applied to lithium ion batteries, lithium-sulfur batteries, lithium fluorinated carbon batteries or lithium-oxygen batteries.