NONAQUEOUS ELECTROLYTIC STORAGE ELEMENT

摘要

To provide nonaqueous electrolytic storage element, containing: a positive electrode, which contains a positive electrode active material capable of accumulating and releasing anions; a negative electrode containing a negative electrode active material capable of accumulating and releasing cations; and a nonaqueous electrolyte containing an electrolyte salt, wherein a capacity of the negative electrode per unit area is larger than a capacity of the positive electrode per unit area, and wherein an amount of the electrolyte salt in the nonaqueous electrode at the time of completion of charging after 50 cycles of charging and discharging is 0.2 mol/L to 1 mol/L, where the cycle of charging and discharging contains charging the nonaqueous electrolytic storage element to 5.2 V with constant electric current of 0.5 mA/cm , followed by discharging the nonaqueous electrolytic storage element to 2.5 V with constant electric current of 0.5 mA/cm .