Patent ID: 8597837

Claim:
A method for producing a lithium-ion secondary battery having positive and negative electrodes capable of absorbing and desorbing lithium ions, and a nonaqueous electrolyte containing a lithium salt in an organic solvent, the production method comprising: assembling a lithium-ion secondary battery using a nonaqueous electrolyte containing in the organic solvent the following components: a lithium salt as a supporting salt; maleic anhydride as additive A; and vinylene carbonate as additive B; and the positive and negative electrodes, the positive electrode comprising an oxide having a spinel structure that is capable of absorbing and desorbing lithium ions as a positive electrode active material; performing an initial charge to the assembled battery up to a predetermined voltage; and performing an aging treatment to the battery by keeping at a temperature of 40 to 80° C. for 40 to 50 hours.