Nonaqueous electrolytic solution and nonaqueous-electrolyte battery employing the same

Patent metadata

Field	Value
Publication number	US-9780409-B2
Application number	US-201414502343-A
Country	US
Kind code	B2
Filing date	Sep 30, 2014
Priority date	Mar 30, 2012
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

The present invention is to provide: a nonaqueous-electrolyte battery excellent in terms of safety during overcharge and high-temperature storability; and a nonaqueous electrolytic solution which gives the battery. The present invention relates to a nonaqueous electrolytic solution comprising an electrolyte and a nonaqueous solvent, wherein the nonaqueous electrolytic solution comprises at least one of specific compounds.

First claim

The invention claimed is:

1. A nonaqueous electrolytic solution, comprising:
an electrolyte;
a nonaqueous solvent; and
at least one of a compound represented by formula (I) and a compound represented by formula (II):

wherein, in formula (I), Ar represents a phenyl group, m represents an integer of 2 or larger, X represents an alkoxycarbonyloxy group, an organic sulfonate group, or a phosphoric acid ester group, and R 1 and R 2 each independently represent a hydrogen atom, a halogen atom, or an optionally substituted hydrocarbon group having 1-12 carbon atoms, and
wherein, in formula (II), A represents an optionally substituted alkylidene groups or cycloalkylidene groups, R 3 to R 12 each independently represent a hydrogen atom, a halogen atom, an optionally substituted hydrocarbon group having 1-12 carbon atoms, an alkoxy group, an alkoxycarbonyloxy group, an organic sulfonate group, or a phosphoric acid ester group, and at least one of the R 3 to R 12 representing an alkoxycarbonyloxy group, an organic sulfonate group, or a phosphoric acid ester group.

2. The nonaqueous electrolytic solution according to claim 1 , wherein R 1 and R 2 in formula (I) are each a hydrogen atom.

3. The nonaqueous electrolytic solution according to claim 1 , wherein the total content of the compound represented by formula (I) and the compound represented by formula (II) in the nonaqueous electrolytic solution is 0.001-10% by mass.

4. The nonaqueous electrolytic solution according to claim 1 , further comprising:
at least one compound selected from the group consisting of cyclic carbonate compounds having a carbon-carbon unsaturated bond, cyclic carbonate compounds having a fluorine atom, monofluorophosphoric acid salts, and difluorophosphoric acid salts.

5. A nonaqueous-electrolyte battery comprising: a negative electrode and a positive electrode which are capable of occluding and releasing lithium ions; and a nonaqueous electrolytic solution, wherein the nonaqueous electrolytic solution is the nonaqueous electrolytic solution according to claim 1 .

6. The nonaqueous electrolytic solution according to claim 1 , comprising the compound of formula (I).

7. The nonaqueous electrolytic solution according to claim 1 , comprising the compound of formula (II).

Assignees

• Mitsubishi Chem Corp

Inventors

• Takiguchi Kanako
• Onuki Masamichi
• Kotato Minoru
• Yamaguchi Ryo
• Nakamura Takeshi
• Aoshima Takayuki

Classifications

• H01M2300/0028

  characterised by the solvent · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2300/0034

  Fluorinated solvents · CPC title

• C07C69/96

  Esters of carbonic or haloformic acids · CPC title