| 摘要 |
Secondary batteries capable of improving cycle characteristics are provided. The secondary battery includes a cathode, an anode, and an electrolytic solution. A separator provided between the cathode and the anode 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 at least one of a nitrile compound. 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. An electrolyte comprising:
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 of a nitrile compound and compounds expressed by Formula (3) to Formula(4):where R1 is 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 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,
R3NCO]a [Chemical Formula 3]where R3 is an organic group with “a” valency containing carbon (C) and at least one element of oxygen (O), nitrogen (N), sulfur (S), silicon (Si), phosphorus (P), boron (B), and halogen, and where “a” is one of integer numbers from 1 to 3 both inclusive,where R4 is an alkyl group with carbon number from 2 to 10 both inclusive, an alkenyl group with carbon number from 2 to 10 both inclusive, a cycloalkyl group, a cycloalkenyl group, an aromatic ring group, a heterocyclic group, or a derivative thereof. |
