NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a non-aqueous electrolyte secondary battery having positive electrode formed of a lithium manganese composite oxide and a negative electrode formed of carbon material and excellent in high temperature storage characteristics. SOLUTION: One or more types of ions selected from among Ba<2+> , Sr<2+> , Cs<+> and K<+> as well as Li<+> ions are added by small amounts into an electrolyte. The ions are deposited on the negative electrode in charging and discharging or storing at high temperatures to form a film. Thus the decomposition of the electrolyte can be suppressed to increase the high temperature storage characteristics.