OPERATION METHOD OF LITHIUM ION SECONDARY BATTERY AND BATTERY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an operation method of a lithium ion secondary battery having excellent cycle characteristics and to provide a battery device.

SOLUTION: The lithium ion secondary battery includes: a positive electrode which has a positive electrode active material capable of storing/discharging lithium ions; a negative electrode which has a negative electrode active material capable of storing/discharging lithium ions and composed of silicon or/and silicon compound; and an electrolyte. The temperature of the lithium ion secondary battery is arranged to be not less than 40°C and not more than 60°C at least during charging.

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