# US 2017/0288271 A1 · Electrolyte solutions for rechargeable batteries

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- Number: US 2017/0288271 A1
- Document ID: US20170288271A1
- Status: Published application
- Kind: A1
- Application number: 15/511,256
- Filed: 2015-09-18
- Published: 2017-10-05
- Earliest claimed: 2014-09-19
- Assignees: 3M Innovative Properties Company
- Applicants: 3M Innovative Properties Company
- Inventors: Dinh Ba Le
- Web page: https://patentgrep.com/patent/US20170288271A1

## CPC

- H01M 10/0568: characterised by the solutes
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/134: Electrodes based on metals, Si or alloys
- 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 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- H01M 2300/0028: characterised by the solvent
- H01M 2300/0037: Mixture of 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

An electrolyte composition includes ethyl acetate and one or more lithium salts. The ethyl acetate is present in the electrolyte composition in an amount of at least 50 volume % based on the total volume of the electrolyte composition.

## Claims

### Claim 1

An electroltye composition comprising:
ethyl acetate;
one or more lithium salts;
a minor solvent component comprising vinylene carbonate;
wherein the ethyl acetate is present in the electrolyte composition in an amount of at least 50 volume % based on the total volume of the electrolyte composition; and
wherein the minor solvent component is present in the electrolyte composition in an amount of up to 30 vol. % based on the total volume of the electrolyte composition.

### Claim 2 (depends on 1)

The electrolyte composition of claim 1, wherein the ethyl acetate is present in the electrolyte composition in an amount of at least 75 volume % based on the total volume of the electrolyte composition.

### Claim 3 (depends on 1)

The electrolyte composition of claim 1, wherein the one or more lithium salts comprise any or all of LiPF6, lithium bis(oxalato)borate, or LiN(SO2CF3)2.

### Claim 4 (depends on 1)

The electrolyte composition of claim 1, wherein the one or more lithium salts comprise LiPF6 and either or both of lithium bis(oxalato)borate and LiN(SO2CF3)2.

### Claim 5

(canceled)

### Claim 6

(canceled)

### Claim 7

A method of making an electrolyte composition, the method comprising:
combining ethyl acetate, a minor solvent component comprising vinylene carbonate, and one or more lithium salts to form the electrolyte composition;
wherein the ethyl acetate is present in the electrolyte composition in an amount of at least 50 volume % based on the total volume of the electrolyte composition; and
wherein the minor solvent component is present in the electrolyte composition in an amount of up to 30 vol. % based on the total volume of the electrolyte composition.

### Claim 8 (depends on 1)

An electrochemical cell comprising:
a positive electrode;
a negative electrode; and
an electrolyte composition according to claim 1.

### Claim 9 (depends on 8)

The electrochemical cell according to claim 8, wherein the positive electrode comprises an active material, and wherein the active material of the positive electrode comprises nickel, manganese, and cobalt.

### Claim 10 (depends on 8)

The electrochemical cell according to claim 8, wherein the negative electrode comprises an active material, and wherein the active material of the negative electrode comprises silicon alloy.

### Claim 11

(canceled)