LITHIUM SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To prevent performance deterioration such as self discharge following decomposition of an electrolytic substance in a lithium secondary battery employing a positive electrode active material having 4.5 V or higher electrode potential. SOLUTION: In this lithium secondary battery containing a transition metal compound with 4.5 V or higher potential to a metal lithium electrode in the positive electrode, a sulfide type lithium ion conductive solid electrolytic substance is used as an electrolytic substance. Consequently, even in the case a positive electrode active material generating high voltage is used, decomposition reaction of the electrolytic substance can be suppressed and a lithium secondary battery with extremely low self discharge can be obtained. It is preferable to employ a sulfide type lithium ion conductive solid electrolytic substance containing crosslinking oxygen and silicon ion bonded with the crosslinking oxygen ion as the sulfide type lithium ion conductive solid electrolytic substance.