Secondary battery, battery pack, electric vehicle, electric power storage system, electric power tool, and electronic apparatus

A secondary battery comprising:

• a cathode;
• an anode;
• and
• an electrolytic solution,
• wherein,
• the anode includes an anode active material layer formed by deposition or sintering and including a simple substance of Si,
• the electrolytic solution includes an unsaturated cyclic ester carbonate represented by the following Formula (3):
• where each of R7, R8, R9, and R10 is a hydrogen group, a halogen group, a monovalent hydrocarbon group, a monovalent halogenated hydrocarbon group, a monovalent oxygen-containing hydrocarbon group, or a monovalent halogenated oxygen-containing hydrocarbon group;
• and any two or more of R7, R8, R9, and are allowed to be bonded to one another,
• a content of the unsaturated cyclic ester carbonate in the electrolytic solution is from 0.01 weight percent to 10 weight percent both inclusive,
• the electrolytic solution includes a nonaqueous solvent and an electrolyte salt, wherein the electrolyte salt comprises at least lithium hexafluorophosphate (LiPF6) and bis[oxalato-O,O′] lithium borate (LiBOB), and
• a content of the electrolyte salt is from 0.3 mol/kg to 3.0 mol/kg both inclusive with respect to the nonaqueous solvent.