Patent ID: 9455476
Filing Date: 2016-09-27
CPC Classification: H01M,Y02E

Claim Text:
1. A secondary battery comprising: a cathode; an anode; and an electrolyte containing a solvent and an electrolyte salt, wherein the solvent contains a first halogenated cyclic ester carbonate shown in Formula 2: where R5to R7are a hydrogen group, a halogen group, or an alkyl group, and at least one thereof is a halogen group, wherein R5 to R7 comprise one or two carbons in the alkyl group, wherein the solvent contains a second halogenated cyclic ester carbonate shown in Formula 7, the second halogenated cyclic ester carbonate being different than the first halogenated cyclic ester carbonate: where R27 to R30 are a hydrogen group, a halogen group, an alkyl group, or a halogenated alkyl group, and at least one of R27 to R30is the halogen group or the halogenated alkyl group, wherein R27 to R30 comprise one or two carbons in the alkyl group or the halogenated alkyl group, wherein the content of the first halogenated cyclic ester carbonate and the second halogenated cyclic ester carbonate in the solvent is from 0.01 wt % to 50% wt %, and wherein the solvent contains unsaturated carbon bond cyclic ester carbonates, the unsaturated carbon bond cyclic ester carbonates being catechol carbonate.