# US 2014/0193706 A1 · Electrolytic solution for nonaqueous electrolytic solution cell, and nonaqueous electrolytic solution cell

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2014/0193706 A1
- Document ID: US20140193706A1
- Status: Published application
- Kind: A1
- Application number: 14/238,498
- Filed: 2012-08-17
- Published: 2014-07-10
- Earliest claimed: 2011-08-31
- Assignees: Central Glass Company, Limited
- Inventors: Takayoshi Morinaka; Yuki Kondo
- Web page: https://patentgrep.com/patent/US20140193706A1

## CPC

- H01M 10/0567: characterised by the additives
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0568: characterised by the solutes
- H01M 2300/0037: Mixture of solvents
- Y02E 60/10: Energy storage using batteries
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Disclosed is an electrolyte for nonaqueous electrolyte cells, which contains a nonaqueous organic solvent and a solute. This electrolyte is characterized by containing as additives at least one compound selected from a first compound group consisting of bis(oxalato)borate, difluoro(oxalato)borate, tris(oxalato)phosphate, difluorobis(oxalato)phosphate, and tetrafluoro(oxalato)phosphate, and at least one compound selected from a second compound group consisting of a sulfonate group-containing imide salt, which is represented by the general formula M[R1OSO2NSO2OR2]n, and a phosphoryl group-containing imide salt, which is represented by the general formula M[R3R4OPNPOR5R6]m. This electrolyte provides nonaqueous electrolyte cells with high-temperature durability without causing swelling and performance deterioration of batteries.

## Claims

### Claim 1

An electrolyte for nonaqueous electrolyte cells, which contains a nonaqueous organic solvent and a solute, wherein the electrolyte for nonaqueous electrolyte cells containing as additives:
at least one compound selected from a first compound group consisting of bis(oxalato)borate, difluoro(oxalato)borate, tris(oxalato)phosphate, difluorobis(oxalato)phosphate, and tetrafluoro(oxalato)phosphate, and
at least one compound selected from a second compound group consisting of a sulfonate group-containing imide salt, which is represented by the following general formula (I),
M[R1OSO2NSO2OR2]n (I)
wherein each of R1 and R2 independently represents at least one organic group selected from a C1-10 straight chain or branched alkyl group or alkenyl group, a C3-10 cycloalkyl group or cycloalkenyl group, and a C6-10 aryl group,
a fluorine atom, an oxygen atom, and/or an unsaturated bond may exist in the organic group,
M represents an alkali metal cation, an alkali earth metal cation or an onium cation, and
n represents an integer equal to valence of the corresponding cation.] and a phosphoryl group-containing imide salt represented by the following general formula (II),
M[R3R4OPNPOR5R6]m (II)
wherein each of R3, R4, R5 and R6 independently represents chlorine, fluorine or an organic group represented by —OR7; and R7 represents at least one organic group selected from a C1-10 straight chain or branched alkyl group or alkenyl group, a C3-10 cycloalkyl group or cycloalkenyl group,
a C6-10 aryl group, and a fluorine atom, an oxygen atom, and/or an unsaturated bond may exist in the organic group,
M represents an alkali metal cation, an alkali earth metal cation or an onium cation, and
m represents an integer equal to valence of the corresponding cation.]

### Claim 2 (depends on 1)

The electrolyte for nonaqueous electrolyte cells as claimed in claim 1, wherein addition of the first compound group is in a range of 0.01-5.0 mass % relative to the electrolyte for nonaqueous electrolyte cells.

### Claim 3 (depends on 1)

The electrolyte for nonaqueous electrolyte cells as claimed in claim 1, wherein addition of the second compound group is in a range of 0.01-10.0 mass % relative to the electrolyte for nonaqueous electrolyte cells.

### Claim 4 (depends on 1)

The electrolyte for nonaqueous electrolyte cells as claimed in claim 1, wherein a countercation of the first compound group is at least one countercation selected from the group consisting of lithium ion, sodium ion, potassium ion, and tetraalkylammonium ion.

### Claim 5 (depends on 1)

The electrolyte for nonaqueous electrolyte cells as claimed in claim 1, wherein the solute is at least one solute selected from the group consisting of LiPF6, LiBF4, (CF3SO2)2NLi, and (C2F5SO2)2NLi.

### Claim 6 (depends on 1)

A nonaqueous electrolyte cell comprising:
a cathode,
an anode comprising lithium or an anode material capable of storing and releasing lithium, and
the electrolyte for nonaqueous electrolyte cells as claimed in claim 1 is used.