Hexamethylene diisocyanate as an electrolyte additive for high-energy density lithium ion batteries

Abstract

Hexamethylene diisocyanate can chemically react with the onium ion produced by the oxidation of propylene carbonate and in situ generate a novel interfacial layer that is stable at high potential. With an appropriate thickness of this film, LiNi_1/3Co_1/3Mn_1/3O₂ presents significantly improved rate and cycle performances when tested between 2.5 and 4.6 V (vs. Li/Li⁺).