Additive for overcharge prevention in a secondary battery and non-aqueous electrolyte for secondary battery including the same

摘要

An additive for overcharge prevention of a lithium ion battery is provided. A non-aqueous electrolyte for a lithium ion battery including a lithium salt and an organic solvent is also provided, which includes both a terphenyl derivative and a xylene derivative. The additive undergoes oxidative polymerization during overcharge and increases resistance of an electrode surface, thereby shutting down overcharge current. When the additive of the present invention is used in the electrolyte of a lithium ion battery, the safety of battery can be improved during overcharge.