# US 10,483,590 B2 · Electrolyte for lithium ion battery and lithium ion battery including the same

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- Number: US 10,483,590 B2
- Document ID: US10483590B2
- Status: Granted
- Kind: B2
- Application number: 15/876,229
- Filed: 2018-01-22
- Published: 2018-07-26
- Granted: 2019-11-19
- Earliest claimed: 2017-01-20
- Assignees: Optimum Battery Co., Ltd.
- Applicants: Optimum Battery Co., Ltd.
- Inventors: Xilin Liu; Mumin Rao; Yao Li
- Web page: https://patentgrep.com/patent/US10483590B2

## 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 10/0569: characterised by the solvents
- H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
- H01M 2300/0042: Four or more solvents
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- 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
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present application provides an electrolyte for lithium ion battery which comprising a mixture of organic solvents consisting of ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate and carboxylate ester, wherein a mass ratio of ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate and carboxylate ester is (20%-30%):(45%-55%):(10%-20%):(5%-15%); a mixture of additives consisting of vinylene carbonate, propane sultone, fluorinated ethylene carbonate and perfluorohexylsulfonyl fluoride; and a lithium salt. The electrolyte for lithium ion battery provided according to the present application has good wettability and high absorption rate. The present application also provides a lithium ion battery with high energy density, small internal resistance, good cycle performance and good charge and discharge performance.

## Claims

### Claim 1

An electrolyte for lithium ion battery, comprising:
a mixture of organic solvents consisting of ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate and carboxylate ester, wherein a mass ratio of ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate and carboxylate ester is (20%-30%):(45%-55%):(10%-20%):(5%-15%);
a mixture of additives consisting of vinylene carbonate, propane sultone, fluorinated ethylene carbonate and perfluorohexylsulfonyl fluoride; and
a lithium salt.

### Claim 2 (depends on 1)

The electrolyte for lithium ion battery according to claim 1, wherein the vinylene carbonate accounts for 1%-5% of the total mass of the mixture of organic solvents.

### Claim 3 (depends on 1)

The electrolyte for lithium ion battery according to claim 1, wherein the propane sultone accounts for 1%-5% of the total mass of the mixture of organic solvents.

### Claim 4 (depends on 1)

The electrolyte for lithium ion battery according to claim 1, wherein the fluorinated ethylene carbonate accounts for 1%-3% of the total mass of the mixture of organic solvents.

### Claim 5 (depends on 1)

The electrolyte for lithium ion battery according to claim 1, wherein the perfluorohexylsulfonyl fluoride accounts for 0.01%-0.2% of the total mass of the mixture of organic solvents.

### Claim 6 (depends on 1)

The electrolyte for lithium ion battery according to claim 1, wherein the lithium salt is selected from a group consisting of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis oxalate borate, lithium difluoro oxalate borate, lithium trifluoromethanesulfonate, lithium perfluoroalkylsulphide, lithium bis (trifluoromethylsulfonyl), and combinations thereof.

### Claim 7 (depends on 6)

The electrolyte for lithium ion battery according to claim 6, wherein a concentration of the lithium salt is 1.0 mol/L-1.3 mol/L.

### Claim 8 (depends on 1)

The electrolyte for lithium ion battery according to claim 1, wherein the mass ratio of ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate and carboxylate ester is 25%:50%:15%:10%.

### Claim 9

A lithium ion battery (100), comprising a shell (10) having an opening at one end, a winding core (20) positioned in the shell (10), an electrolyte received in the shell (10) and immersing the winding core (20), and a cap cover (30) positioned in the opening for enclosing the opening; wherein the electrolyte comprising:
a mixture of organic solvents consisting of ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate and carboxylate ester, wherein a mass ratio of ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate and carboxylate ester is (20%-30%):(45%-55%):(10%-20%):(5%-15%);
a mixture of additives consisting of vinylene carbonate, propane sultone, fluorinated ethylene carbonate and perfluorohexylsulfonyl fluoride; and
a lithium salt.

### Claim 10 (depends on 9)

The lithium ion battery (100) according to claim 9, wherein the vinylene carbonate accounts for 1%-5% of the total mass of the mixture of organic solvents.

### Claim 11 (depends on 9)

The lithium ion battery (100) according to claim 9, wherein the propane sultone accounts for 1%-5% of the total mass of the mixture of organic solvents.

### Claim 12 (depends on 9)

The lithium ion battery (100) according to claim 9, wherein the fluorinated ethylene carbonate accounts for 1%-3% of the total mass of the mixture of organic solvents.

### Claim 13 (depends on 9)

The lithium ion battery (100) according to claim 9, wherein the perfluorohexylsulfonyl fluoride accounts for 0.01%-0.2% of the total mass of the mixture of organic solvents.

### Claim 14 (depends on 9)

The lithium ion battery (100) according to claim 9, wherein the lithium salt is selected from a group consisting of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis oxalate borate, lithium difluoro oxalate borate, lithium trifluoromethanesulfonate, lithium perfluoroalkylsulphide, lithium bis (trifluoromethylsulfonyl), and combinations thereof.

### Claim 15 (depends on 14)

The lithium ion battery (100) according to claim 14, wherein a concentration of the lithium salt is 1.0 mol/L-1.3 mol/L.

### Claim 16 (depends on 9)

The lithium ion battery (100) according to claim 9, wherein the mass ratio of ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate and carboxylate ester is 25%:50%:15%:10%.