| abstract |
Provided is a secondary battery that realizes a high operating voltage while suppressing a decrease in capacity due to a cycle and a decrease in reliability at a high temperature. SOLUTION: A positive electrode active material having an average discharge potential of 4.5 V or more with respect to Li is used, and as a solvent constituting an electrolytic solution, at least one of a high dielectric constant solvent such as ethylene carbonate and dimethyl carbonate or ethyl methyl carbonate is used. Use a combination of one and the other. [Selection diagram] None |