| 摘要 |
It is made possible to keep a nonaqueous electrolyte secondary battery in a charged state for a long period of time and minimize the degradation of the battery. A method for charging a nonaqueous electrolyte secondary battery including a cathode, an anode, and a nonaqueous electrolyte, includes: a first charging step of charging the nonaqueous electrolyte secondary battery at a first current value which increases the voltage of the nonaqueous electrolyte secondary battery; and a second charging step of charging the nonaqueous electrolyte secondary battery at a second current value which decreases the voltage of the nonaqueous electrolyte secondary battery. These two charging steps are repeated alternately.
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