Nonaqueous electrolytic solution and nonaqueous-electrolyte battery employing the same

• US 9,780,409 B2
• Filed: 09/30/2014
• Issued: 10/03/2017
• Est. Priority Date: 03/30/2012
• Status: Active Grant

• Current Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.), MU Ionic Solutions Corporation
• Original Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Inventors: Takiguchi, Kanako, Onuki, Masamichi, Kotato, Minoru, Yamaguchi, Ryo, Nakamura, Takeshi, Aoshima, Takayuki
• Primary Examiner(s): DOUYETTE, KENNETH J
• Application Number:
  US14/502,343
• Publication Number:
  US 20150024284A1
• Time in Patent Office: 1,099 Days
• CPC Class Codes: C07C 69/96 Esters of carbonic or haloformic acids
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0567 characterised by the additives
• CPC Class Codes: H01M 2300/0025 Organic electrolyte
• CPC Class Codes: H01M 2300/0028 characterised by the solvent
• CPC Class Codes: H01M 2300/0034 Fluorinated solvents
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

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.

Claims

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);

2. The nonaqueous electrolytic solution according to claim 1, wherein R¹ and R² 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).