Nonaqueous electrolytic solution and nonaqueous-electrolyte battery
View Patent ↗Disclosed is a nonaqueous electrolytic solution which enables formation of a nonaqueous-electrolyte battery having high capacity and excellent storage characteristics at high temperatures, while sufficiently enhancing safety at the time of overcharge. A nonaqueous-electrolyte battery produced by using the nonaqueous electrolytic solution is also disclosed. The nonaqueous electrolytic solution comprises an electrolyte and a nonaqueous solvent, and includes any of specific nonaqueous electrolytic solutions (A) to (D).
1. A main nonaqueous electrolytic solution, comprising:
an electrolyte; and
a nonaqueous solvent,
wherein the nonaqueous electrolytic solution comprises:
(A) a first nonaqueous electrolytic solution which comprises (a1) a compound of formula (1)
wherein
R 1 represents an alkyl group comprising 1-12 carbon atoms, optionally substituted with at least one selected from the group consisting of a halogen atom and a phenyl group, and
R 2 to R 6 each independently represent a hydrogen atom or a halogen atom, and
(a2) at least one compound selected from the group consisting of a cyclic carbonate comprising an unsaturated C═C bond, a cyclic carbonate comprising a fluorine atom, a monofluorophosphoric acid salt, and a difluorophosphoric acid salt;
(a3) a cyclic carbonate selected from the group consisting of ethylene carbonate and propylene carbonate,
(a4) an asymmetric chain dialkyl carbonate, and
(a5) a symmetric chain dialkyl carbonate.
2. The nonaqueous electrolytic solution of claim 1 , wherein a content of the compound (a1) of formula (1) in a proportion to the nonaqueous electrolytic solution (A) is 0.001% by weight or higher but less than 10% by weight.
3. The nonaqueous electrolytic solution of claim 1 , wherein a content of the at least one compound (a2) in a proportion to the first nonaqueous electrolytic solution (A) is from 0.001% by weight to 10% by weight.
4. A nonaqueous-electrolyte battery, comprising:
a negative electrode and a positive electrode which occlude and release a lithium ion; and
a nonaqueous electrolytic solution,
wherein the nonaqueous electrolytic solution is the main nonaqueous electrolytic solution of claim 1 .