# US 10,320,030 B2 · Nonaqueous electrolyte solution and nonaqueous electrolyte battery employing the same

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- Number: US 10,320,030 B2
- Document ID: US10320030B2
- Status: Granted
- Kind: B2
- Application number: 14/582,676
- Filed: 2014-12-24
- Published: 2015-05-21
- Granted: 2019-06-11
- Earliest claimed: 2012-06-29
- Assignees: Mitsubishi Chemical Corporation
- Applicants: Mitsubishi Chemical Corporation
- Inventors: Kanako Takiguchi; Masamichi Onuki; Shuhei Sawa
- Web page: https://patentgrep.com/patent/US10320030B2

## 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 10/0569: characterised by the solvents
- H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)}
- H01M 2300/0034: Fluorinated solvents
- Y02E 60/10: Energy storage using 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

## Abstract

Provided is a nonaqueous electrolyte solution battery with dramatically improved battery characteristics. A nonaqueous electrolyte solution battery prepared by using a nonaqueous electrolyte solution comprising (I) an aromatic carboxylic acid ester compound represented by General Formula (1) below; and (II) specific compounds, is improved in charge-discharge characteristics at high current densities, durability performance during high-temperature storage and overcharge characteristics. (in General Formula (1), A1 is —R1 or —OR1, with R1 being an optionally substituted hydrocarbon group with 10 or fewer carbon atoms; A2 is an optionally substituted aryl group; each of j and k is independently 0 or an integer greater than 0, and at least one of j and k is an integer not less than 1; and when k≥1, A1 is —OR1, while when k=0, A1 is —R1; and the case of j=1, k=0 is not allowed).

## Claims

### Claim 1

A nonaqueous electrolyte solution comprising an electrolyte; and a nonaqueous solvent,
the nonaqueous electrolyte solution further comprising component (I) and (II):
(I) an aromatic carboxylic acid ester compound represented by Formula (1) below, wherein the total content of the component (I) in the nonaqueous electrolyte solution ranges from 0.5 mass % to 5 mass %; and
(II) a fluorinated ethylene carbonate wherein total content of the component (II) in the nonaqueous electrolyte solution ranges from 0.1 mass % to 20 mass %:
wherein A1 is —R1 or —OR1, with R1 being an optionally substituted hydrocarbon group with 10 or fewer carbon atoms; A2 is an optionally substituted aryl group; each of j and k is independently 0 or an integer greater than 0, and at least one of j and k is an integer not less than 1; and when k≥1, A1 is —OR1, while when k=0, A1 is —R1; and the case of j=1, k=0 is not allowed.

### Claim 2 (depends on 1)

The nonaqueous electrolyte solution according to claim 1, wherein said nonaqueous electrolyte solution further comprises:
(i) a compound having a SO2 group which is at least one compound selected from the group consisting of chain sulfonic acid esters, cyclic sulfonic acid esters, chain sulfuric acid esters, cyclic sulfuric acid esters, chain sulfurous acid esters and cyclic sulfurous acid esters; and/or
a Si-containing compound is a compound represented by Formula (3)
wherein
R5, R6 and R7 independently represent a hydrogen atom, a halogen atom or a hydrocarbon group with 10 or fewer carbon atoms, and
X3 is an organic group containing at least one atom selected from the group consisting of oxygen, nitrogen and silicon.

### Claim 3 (depends on 1)

The nonaqueous electrolyte solution according to claim 1, wherein at least one of j and k is an integer not less than 2 in Formula (1).

### Claim 4 (depends on 1)

The nonaqueous electrolyte solution according to claim 1, further comprising a cyclic carbonate having a carbon-carbon unsaturated bond.

### Claim 5 (depends on 1)

A nonaqueous electrolyte solution battery comprising negative and positive electrodes capable of storing and releasing lithium ions; and a nonaqueous electrolyte solution, wherein the nonaqueous electrolyte solution is the nonaqueous electrolyte solution according to claim 1.

### Claim 6 (depends on 1)

The nonaqueous electrolyte solution according to claim 1, further comprising at least one kind of compound selected from the group consisting of a fluorosulfonate salt, a compound having SO2 group, and a Si-containing compound.