Nonaqueous electrolytic solution and nonaqueous-electrolyte battery

Abstract

Disclosed is a nonaqueous electrolytic solution which forms a nonaqueous-electrolyte battery having high capacity and excellent storage characteristics at high temperatures, while sufficiently enhancing safety at the time of overcharge, and a nonaqueous-electrolyte battery using the same. The nonaqueous electrolytic solution has an electrolyte and a nonaqueous solvent with (A) a compound of formula (2): wherein Ris an optionally halogenated and/or phenylated alkyl group comprising 1-12 carbon atoms, Rto Rare independently a hydrogen atom, a halogen atom, an optionally halogenated ether or alkyl group comprising 1-12 carbon atoms, and at least one of Rto Ris an optionally halogenated alkyl group comprising 2-12 carbon atoms; and/or (B) a carboxylic acid ester with a phenyl group substituted by at least one alkyl group (having 4 or more carbon atoms) that is optionally substituted.