# US 2017/0288265 A1 · High voltage solid electrolyte compositions

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- Number: US 2017/0288265 A1
- Document ID: US20170288265A1
- Status: Published application
- Kind: A1
- Application number: 15/085,936
- Filed: 2016-03-30
- Published: 2017-10-05
- Earliest claimed: 2016-03-30
- Assignees: Wildcat Discovery Technologies, Inc.
- Applicants: Wildcat Discovery Technologies, Inc.
- Inventors: Bin Li; Marissa Caldwell
- Web page: https://patentgrep.com/patent/US20170288265A1

## CPC

- H01M 10/0565: Polymeric materials, e.g. gel-type or solid-type
- C08J 3/09: in organic liquids
- C08J 5/2256: {based on macromolecular compounds obtained by reactions other than those involving carbon-to-carbon bonds, e.g. obtained by polycondensation}
- H01B 1/12: organic substances {(organic macromolecular compounds or compositions C08)}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- C08J 2371/02: Polyalkylene oxides
- H01M 2300/0082: Organic polymers
- H01M 2300/0085: Immobilising or gelification of electrolyte
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

An electrochemical cell having an anode, a solid electrolyte, and a cathode. The solid electrolyte includes a polymer gel formed from an ethylene oxide polymer combined with a liquid precursor. The liquid precursor contains at least 15 molar percent of a lithium salt in a solvent.

## Claims

### Claim 1

An electrochemical cell, comprising:
an anode;
a cathode comprising an electrode active material; and
a solid electrolyte film layer comprising: (i) a polymer gel, wherein the polymer gel comprises an ethylene oxide polymer portion; (ii) a liquid portion, wherein the liquid portion comprises a solvent; and (iii) at least 6 weight percent of a lithium salt;
wherein the electrolyte is electrochemically stable at voltages greater than about 4.4 V.

### Claim 2 (depends on 1)

The electrochemical cell of claim 1, wherein the liquid portion comprises butylene carbonate.

### Claim 3 (depends on 1)

The electrochemical cell of claim 1, wherein the liquid portion comprises butyl sulfoxide.

### Claim 4 (depends on 1)

The electrochemical cell of claim 1, wherein the liquid portion comprises n-methyl-2-pyrrolidone.

### Claim 5 (depends on 2)

The electrochemical cell of claim 2, wherein the lithium salt comprises lithium bis(trifluoromethanesulfonyl)imide.

### Claim 6 (depends on 1)

The electrochemical cell of claim 1, wherein the liquid portion comprises butylene carbonate and the lithium salt is lithium bis(trifluoromethanesulfonyl)imide.

### Claim 7 (depends on 4)

The electrochemical cell of claim 4, wherein the lithium salt comprises lithium bis(trifluoromethanesulfonyl)imide.

### Claim 8 (depends on 1)

The electrochemical cell of claim 1, wherein the liquid portion comprises n-methyl-2-pyrrolidone and the lithium salt is lithium bis(trifluoromethanesulfonyl)imide.

### Claim 9 (depends on 2)

The electrochemical cell of claim 2, wherein the lithium salt comprises lithium tetrafluoroborate.

### Claim 10 (depends on 1)

The electrochemical cell of claim 1, wherein the liquid portion comprises butylene carbonate and the lithium salt is lithium tetrafluoroborate.

### Claim 11 (depends on 3)

The electrochemical cell of claim 3, wherein the lithium salt comprises lithium tetrafluoroborate.

### Claim 12 (depends on 1)

The electrochemical cell of claim 1, wherein the liquid portion comprises butyl sulfoxide and the lithium salt is lithium tetrafluoroborate.

### Claim 13 (depends on 1)

The electrochemical cell of claim 1, wherein the ethylene oxide polymer is represented by:
where n≧1, R1, R2, R3, and R4 are each independently selected from the group consisting of hydrogen, substituted and unsubstituted hydride groups, substituted and unsubstituted hydroxy groups, substituted and unsubstituted alkyl groups, substituted and unsubstituted alkenyl groups, substituted and unsubstituted alkynyl groups, substituted and unsubstituted aryl groups, substituted and unsubstituted iminyl groups, substituted and unsubstituted alkoxy groups, substituted and unsubstituted alkenoxy groups, substituted and unsubstituted alkynoxy groups, substituted and unsubstituted aryloxy groups, substituted and unsubstituted vinyl groups, substituted and unsubstituted acrylic groups, and substituted and unsubstituted acryloyl groups.

### Claim 14

A method of making an electrolyte, comprising:
forming a liquid precursor by suspending at least 20 molar percent of a lithium salt in a liquid solvent;
combining an ethylene oxide polymer and the liquid precursor to form a gel; and
annealing the gel.

### Claim 15 (depends on 14)

The method of claim 14 wherein the combining is done via mechanical milling.

### Claim 16 (depends on 14)

The method of claim 14 wherein the annealing is done at less than about 90 degrees Celsius.

### Claim 17 (depends on 14)

The method of claim 14 wherein the liquid precursor comprises butylene carbonate and about 20 molar percent lithium bis(trifluoromethanesulfonyl)imide.

### Claim 18 (depends on 14)

The method of claim 14 wherein the liquid precursor comprises n-methyl-2-pyrrolidone and about 20 molar percent lithium bis(trifluoromethanesulfonyl)imide.

### Claim 19 (depends on 14)

The method of claim 14 wherein the liquid precursor comprises butylene carbonate and about 20 molar percent lithium tetrafluoroborate.

### Claim 20 (depends on 14)

The method of claim 14 wherein the liquid precursor portion butyl sulfoxide and about 20 molar percent lithium tetrafluoroborate.