| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary battery using a nonaqueous electrolyte having large ion conductivity even in use at a low temperature in a cold district. SOLUTION: This secondary battery is a nonaqueous electrolyte consisting of electrolyte salt (A) and a mixed solvent (B) of dimethyl carbonate (DMC), methyl ethyl carbonate(MEC) and cyclic ester carbonate, composition ratio of dimethyl carbonate, methyl ethyl carbonate and cyclic ester carbonate in the mixed solvent, relating to a solvent total unit (total amount of dimethyl carbonate, methyl ethyl carbonate and cyclic ester carbonate), contains 10 to 70vol.% DMC, 10 to 70vol.% MEC and 1vol.% or 20vol.% or less cyclic ester carbonate. |
