ELECTROLYTE SOLUTION FOR SECONDARY BATTERIES, SECONDARY BATTERY, BATTERY PACK, ELECTRIC VEHICLE, ELECTRICAL ENERGY STORAGE SYSTEM, ELECTRIC TOOL AND ELECTRONIC DEVICE

摘要

This secondary battery comprises a positive electrode, a negative electrode, and an electrolyte solution which is configured such that: (A) a solvent and an electrolyte salt are contained therein, and the solvent contains ethylene carbonate; (B) the content of the electrolyte salt is from 0.8 mol/kg to 2.0 mol/kg (inclusive); (C) the content of ethylene carbonate in the solvent is from 10% by weight to 30% by weight (inclusive); (D) the ratio of the number of moles M2 of the ethylene carbonate to the number of moles M1 of the electrolyte salt, namely M2/M1 is from 0.4 to 2.4 (inclusive); and (E) at least one sulfone compound is contained therein.