| 摘要 |
PROBLEM TO BE SOLVED: To provide a charging/discharging method with excellent cycle life, which has a large capacity of 30 Wh or more and volume energy density of 180 Wh/l or more and is applicable to a flat nonaqueous secondary battery of the thickness of less than 12 mm. SOLUTION: Provided maximum operating voltage range of a nonaqueous secondary battery which houses a cathode, an anode, a separator and lithium salt in a battery receptacle is V2 to V1 (V2>V1), and discharging volume obtained within the above maximum operating voltage range in initial condition is C, the nonaqueous secondary battery characteristically makes a charge/ discharge within the capacity range of not more than 0.8C with V1 as a basis. |
