Electrolyte solution and secondary battery using same
AssigneeNEC Corporation
InventorsYuukou Katou, Takehiro Noguchi, Makiko Takahashi, Hideaki Sasaki
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Abstract
The present invention relates to a nonaqueous electrolyte solution comprising a nonaqueous electrolyte solvent which comprises a fluorine-containing phosphate ester represented by a specific formula, a fluorine-containing ether represented by a specific formula, and an open-chain or cyclic acid anhydride. According to the present invention, there is provided an electrolyte solution capable of realizing a lithium secondary battery having an excellent cycle characteristics with little gas generation after charge-discharge cycles.
Claims20
A nonaqueous electrolyte solution comprising a nonaqueous electrolyte solvent which comprises a fluorine-containing phosphate ester represented by following formula (1), a fluorine-containing ether represented by following formula (2), a cyclic sulfone compound represented by following formula (8-1), and an open-chain acid anhydride, wherein a content of the fluorine-containing phosphate ester is 5 vol % or more and 95 vol % or less in the nonaqueous electrolyte solvent, and a part or all of hydrogen atoms of the acid anhydride is replaced with fluorine atom;
- wherein R1, R2 and R3 are the same fluorine-containing alkyl groups,
- A-O—B (2)
- wherein A and B are each independently substituted or unsubstituted alkyl group, and at least one of A and B is a fluorine-containing alkyl group,
- wherein, R3 represents a substituted or unsubstituted alkylene group.
A method of producing a nonaqueous electrolyte solution comprising a nonaqueous electrolyte solvent, comprising a step of mixing a fluorine-containing phosphate ester represented by following formula (1), a fluorine-containing ether represented by following formula (2), a cyclic sulfone compound represented by following formula (8-1), and an open-chain or cyclic acid anhydride, wherein a content of the fluorine-containing phosphate ester is 5 vol % or more and 95 vol % or less in the nonaqueous electrolyte solvent and a part or all of hydrogen atoms of the acid anhydride is replaced with fluorine atom;
- wherein R1, R2 and R3 are fluorine-containing alkyl groups,
- A-O—B (2)
- wherein A and B are each independently substituted or unsubstituted alkyl group, and at least one of A and B is a fluorine-containing alkyl group,
- wherein, R3 represents a substituted or unsubstituted alkylene group.
Dependencies are inferred from the claim text.