To provide high discharge capacity and excellent battery characteristics when used in low temperature environment after continuous charging has been performed under high temperature environment, and even after the secondary battery has been stored under high temperature environment by improving non-aqueous solvent.
The secondary battery is provided with a positive electrode 3, a negative electrode 5 containing carbonaceous material which stores/releases lithium ions, and with non-aqueous electrolytic solution composed of non-aqueous solvent in which electrolyte is dissolved. In this case, the non-aqueous solvent is obtained by adding propylene carbonate added to mixed solvent composed of ethyl methyl carbonate, diethyl carbonate, and of dimethyl carbonate.
OHASHI HIROBUMI
HAYAMI MUNEHITO
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