Lithium-ion secondary battery
View Patent ↗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.
1. A lithium-ion secondary battery comprising a negative electrode active material, a positive electrode active material, and an electrolytic solution;
wherein the negative electrode active material contains elemental silicon or a silicon-containing alloy or a silicon-containing oxide;
wherein the electrolytic solution has a lithium salt and a solvent;
wherein the solvent contains a cyclic carbonate, a chain carbonate, fluoroethylene carbonate represented by the formula (1), and 1,3-propane sultone;
wherein fluoroethylene carbonate has a mass concentration Cf of 0.1 to 3 mass % in the electrolytic solution;
wherein 1,3-propane sultone has a mass concentration Cp of 0.1 to 3 mass % in the electrolytic solution; and
wherein Cf>Cp.