Lithium cell electrolyte

Abstract

A lithium battery electrolyte comprises lithium salt, organic solvent and the chemical additive. The lithium salt is one of lithium per chlorate, trifluoromethyl lithium sulfonate, six lithium flu phosphate, six fluorine arsenic acids lithium, the tetrachloride aluminum lithium, in the tetrachloride boron lithium one kind or its combination thing, the density is 0.5-2.0mol / L; The organic solvent is alkyl phosphate RPO3R ' R ';The chemical additive is the (volume compares) two oxygen link fifth heavenly stem Alkane DOL whose density is density is 0-5% . This invention has good anti- burn performance, the electrolyte conductivity maximum value can reach 4.0mS-1 also but not to affect the reaction nature of plurity of insertion electrode, may be used in -50 degree C-120 degree C temperature ranges, also causes the cathode surface to form a high flexible SEI membrane, thus enhance the safety of lithium battery in the production, storage and transportation and reduce the production cost.

Description

technical field [0001] The invention relates to a lithium battery electrolyte, in particular to a cheap lithium battery electrolyte with high-efficiency flame-retardant properties. Background technique [0002] Safety is a key issue restricting the development of large-capacity and high-power lithium batteries. At present, most of the electrolytes used in lithium batteries are organic carbonate (ether) systems. This type of organic solution has a low flash point and is easy to explode and burn under abuse conditions such as over-discharge, heat or leakage, thereby bringing safety hazards to the battery. In recent years, the development of flame-retardant electrolyte has become one of the main measures to solve the safety of lithium secondary batteries, and a variety of liquid flame retardants have been reported in the literature, such as X.L.Yao et al. [J.Power Sources, 144, 2005] in Phosphate is added to the electrolyte, and H.Y.Xu et al. [Electrochim.Acta, 25, 2006] add f...

AI Technical Summary

Problems solved by technology

However, in practical applications, it can be found that the cost of the combination scheme of the non-aqueous electrolyte is high and the feasibility is low.