LITHIUM SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a secondary battery having battery characteristics that do not decrease and being excellent in safety such that explosion and firing are prevented even in the event of breakdown due to an internal short circuit or overcharging. SOLUTION: This lithium secondary battery, including positive and negative electrodes which reversibly store and release lithium and an electrolyte containing lithium ions, contains an oxygen absorber. The oxygen absorber is preferably heat polymerizable and is preferably a polysiloxane compound or phenylene oxide compound which absorbs and polymerizes oxygen desorbed from the electrodes. The lithium ion secondary battery having enhanced safety for battery breaking tests can thus be obtained.