INHIBITION OF ELECTROLYTE OXIDATION IN LITHIUM ION BATTERIES WITH ELECTROLYTE ADDITIVES

摘要

A lithium ion battery electrolyte for use in lithium ion batteries. The electrolyte includes LiPF6, LiBF4, LiB(C2O4)2, or a related salt dissolved in a mixture of organic carbonate, ether or ester solvents with low concentrations of oxidatively unstable additives such that the additives react with a surface of cathode particles to generate a passivation film which prevents oxidation of the electrolyte by the cathode. The additive is a polymerizable organic molecule selected from 2,3-dihydrofuran (2,3-DHF), 2,5-dihydrofuran (2,5-DHF), vinylene carbonate (VC), vinyltrimethoxysilane (VTMS), dimethyl vinylene cabonate (DMVC), and gamma-buyrolactone, or related unsaturated ethers, esters, or carbonates.