| 摘要 |
A lithium-ion secondary battery comprises a negative electrode active material, a positive electrode active material, and an electrolytic solution. The negative electrode active material contains elemental silicon or a silicon-containing alloy. The electrolytic solution has a lithium salt and a solvent. The solvent contains a cyclic carbonate, a chain carbonate, fluoroethylene carbonate represented by the formula (1), and 1,3-propane sultone. In the electrolytic solution, fluoroethylene carbonate has a mass concentration Cf of 0.1 to 3 mass %, 1,3-propane sultone has a mass concentration Cp of 0.1 to 3 mass %, and Cf>Cp.
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