Nonaqueous electrolytic solution containing glycol sulfate derivative and fluoroethylene carbonate and lithium ion secondary battery containing the same
View Patent ↗A nonaqueous electrolytic solution includes a cyclic carbonate and a chain carbonate, and contains a glycol sulfate derivative represented by formula (I) below and fluoroethylene carbonate: [wherein each of R 1 and R 2 independently represents at least one selected from the group consisting of a hydrogen atom and a hydrocarbon group having 1 to 5 carbon atoms].
1. A nonaqueous electrolytic solution comprising:
a cyclic carbonate and a chain carbonate;
a glycol sulfate derivative represented by formula (I) below; and
fluoroethylene carbonate:
wherein:
each of R 1 and R 2 independently represents at least one selected from the group consisting of a hydrogen atom and a hydrocarbon group having 1 to 5 carbon atoms;
the glycol sulfate derivative is present in an amount in a range of from 1 to 4 wt. %; and
the fluoroethylene carbonate is present in an amount in a range of from 1 to 3 wt. %.
2. The nonaqueous electrolytic solution according to claim 1 , wherein the glycol sulfate derivative includes any of 1,3,2-dioxathiolane-2,2-dioxide, 4-methyl-1,3,2-dioxathiolane-2,2-dioxide, and 4-ethyl-1,3,2-dioxathiolane-2,2-dioxide.
3. A lithium ion secondary battery comprising:
a positive electrode;
a negative electrode;
a separator; and
a nonaqueous electrolytic solution comprising:
a cyclic carbonate and a chain carbonate,
a glycol sulfate derivative represented by formula (I) below, and
fluoroethylene carbonate:
wherein:
each of R 1 and R 2 independently represents at least one selected from the group consisting of a hydrogen atom and a hydrocarbon group having 1 to 5 carbon atoms;
the glycol sulfate derivative is present in the nonaqueous electrolytic solution in an amount in a range of from 1 to 4 wt. %; and
the fluoroethylene carbonate is present in the nonaqueous electrolytic solution in an amount in a range of from 1 to 3 wt. %.
4. The lithium ion secondary battery according to claim 3 , wherein the glycol sulfate derivative includes any of 1,3,2-dioxathiolane-2,2-dioxide, 4-methyl-1,3,2-dioxathiolane-2,2-dioxide, and 4-ethyl-1,3,2-dioxathiolane-2,2-dioxide.
5. The nonaqueous electrolytic solution according to claim 1 , wherein the glycol sulfate derivative is 1,3,2-dioxathiolane-2,2-dioxide.
6. The lithium ion secondary battery according to claim 3 , wherein the glycol sulfate derivative is 1,3,2-dioxathiolane-2,2-dioxide.
7. The lithium ion secondary battery according to claim 3 , wherein the battery has an improved discharge capacity at a temperature of −10° C.