| 摘要 |
A method for charging a non-aqueous electrolyte secondary battery, the battery comprising a positive electrode that comprises a lithium-containing composite oxide, a negative electrode, and a non-aqueous electrolyte. The method comprises the step of detecting an open-circuit-voltage of the battery to determine which of voltage regions A, B and C the detected value is included in. The region A is not smaller than a prescribed value X. The region B is smaller than the prescribed value X and larger than a prescribed value Y (Y<X). The region C is not larger than the value Y. According to the determination, charging is stopped when the detected value is included in the region A, charging is conducted when the detected value is included in the region B, or discharging is conducted until a closed-circuit-voltage of the battery becomes not larger than a prescribed value Z and then charging is conducted, when the detected value is included in the region C.
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