Lithium ion secondary battery

Abstract

A lithium ion secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution, in which the negative electrode includes a current collector and a negative electrode active material layer disposed on at least one side of the current collector, the negative electrode active material layer includes a negative electrode active material including graphite particles and amorphous carbon fine particles, the electrolytic solution includes at least a non-aqueous solvent, an electrolyte salt, and an additive, and the additive includes a fluorosulfonate and a methoxysulfonate. Consequently, it is possible to achieve both an improvement in power characteristics and an improvement in high temperature storage characteristics in a low SOC range in the lithium ion secondary battery.

Dependencies are inferred from the claim text.