| 摘要 |
A secondary battery capable of improving cycle characteristics is provided. The secondary battery includes a cathode 21, an anode 22, and an electrolytic solution. A separator 23 provided between the cathode 21 and the anode 22 is impregnated with the electrolytic solution. The electrolytic solution contains a solvent and an electrolyte salt. The solvent contains a cyclic compound having a disulfonic acid anhydride group (—S(═O)2—O—S(═O)2—) and succinonitrile. Compared to a case that the solvent does not contain both the cyclic compound having the disulfonic acid anhydride group and succinonitrile or a case that that the solvent contains at least one thereof, chemical stability of the electrolytic solution is improved. Thus, even if charge and discharge are repeated, electrolytic solution decomposition is inhibited. |
| 主权项 |
1. A secondary battery comprising:
a cathode including a cathode active material layer on a cathode current collector, the cathode active material layer including a cathode active material, a cathode binder, and a cathode electrical conductor, and
the cathode active material consisting essentially of a compound expressed by LixM1O2 or LiyM2PO4, where M1 and M2 each represent a single transition metal element, and where 0.05≦x≦1.10 and 0.05≦y≦1.10; an anode; and an electrolyte containing a solvent and an electrolyte salt,
wherein the solvent contains at least one type of sulfone compounds expressed by Formula (1) and Formula (2): and at least one compound expressed by Formula (5) in an amount of greater than 0% and up to 10% by mass relative to the solvent: where R1 is an alkylene group with carbon number from 2 to 4 both inclusive or a halogenated group thereof, an alkenylene group with carbon number from 2 to 4 both inclusive or a halogenated group thereof, an arylene group or a halogenated group thereof, or a derivative thereof where R2 is an alkylene group with carbon number from 2 to 4 both inclusive or a halogenated group thereof, an alkenylene group with carbon number from 2 to 4 both inclusive or a halogenated group thereof, an arylene group or a halogenated group thereof, or a derivative thereof where R5 and R6 are an alkyl group with carbon number from 1 to 10 both inclusive or a halogenated alkyl group with carbon number from 1 to 10 both inclusive, where at least one of R5 and R6 is the halogenated alkyl group with carbon number from 1 to 10 both inclusive. |
