Patent ID: 8980483
Filing Date: 2015-03-17
Classification: H01M,Y02E,Y02P

Abstract:
1. A secondary battery comprising: a positive electrode; a negative electrode; and an electrolyte containing a solvent and an electrolyte salt, wherein the solvent contains an organic acid represented by formula (1) and at least one selected from sulfone compounds represented by formulae (2) and (3): X represents —(O═)C—(C(R) 2 ) a —C(═O)—, —(O═) 2 S—(C(R) 2 ) a —S(═O) 2 —, —(O═)C—(C(R) 2 ) a —S(═O) 2 —, —(C(R) 2 ) b —C(═O)—, or —(C(R) 2 ) b —S(═O) 2 — where R represents a hydrogen group, an alkyl group, an aryl group, a halogen group, a halogenated alkyl group, or a halogenated aryl group, a represents an integer of 0 to 4, and b represents an integer of 1 to 5; Y represents a C2-C4 alkylene or halogenated alkylene group, a C2-C4 alkenylene or halogenated alkenylene group, an arylene or halogenated arylene group, or a derivative thereof; and Z represents a C2-C4 alkylene or halogenated alkylene group, a C2-C4 alkenylene or halogenated alkenylene group, an arylene or halogenated arylene group, or a derivative thereof.