# US 12,113,256 B2 · Solid electrolyte membrane and use thereof in batteries

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- Number: US 12,113,256 B2
- Document ID: US12113256B2
- Status: Granted
- Kind: B2
- Application number: 17/993,644
- Filed: 2022-11-23
- Published: 2023-03-23
- Granted: 2024-10-08
- Earliest claimed: 2018-01-22
- Assignees: North Carolina Agricultural and Technical State University; The University of North Carolina at Greensboro
- Applicants: North Carolina Agricultural and Technical State University; The University of North Carolina at Greensboro
- Inventors: Sung-Jin Cho; Alla Letfullina
- Web page: https://patentgrep.com/patent/US12113256B2

## CPC

- H01M 8/124: characterised by the process of manufacturing or by the material of the electrolyte
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 4/02: Electrodes composed of, or comprising, active material
- H01M 4/8673: {Electrically conductive fillers}
- H01M 8/1004: characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence)
- H01M 10/0568: characterised by the solutes
- H01M 10/0569: characterised by the solvents
- H01M 4/8668: {Binders}
- H01M 2004/027: {Negative electrodes}
- H01M 2004/028: {Positive electrodes}
- H01M 2008/1095: {Fuel cells with polymeric electrolytes}
- H01M 2300/0022: Room temperature molten salts
- H01M 2300/0028: characterised by the solvent
- 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
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The presently disclosed subject matter relates generally to a highly ionically conductive solid electrolyte membrane and to batteries comprising such solid electrolyte membrane.

## Claims

### Claim 1

A solid electrolyte membrane consisting of a single layer comprising glutaronitrile, a nitrile-containing polymer, and about 2.5 weight (wt.) % to about 15 wt. % of a non-polarizable lithium salt, and wherein said solid electrolyte membrane does not comprise a polarizable lithium salt and is free of succinonitrile.

### Claim 2 (depends on 1)

The solid electrolyte membrane of claim 1, wherein the non-polarizable lithium salt is one or more salts selected from the group consisting of lithium hexafluorophosphate, lithium tetrafluoroborate, and lithium perchlorate.

### Claim 3 (depends on 2)

The solid electrolyte membrane of claim 2, wherein the non-polarizable lithium salt is lithium hexafluorophosphate.

### Claim 4 (depends on 1)

The solid electrolyte membrane of claim 1, wherein the nitrile-containing polymer is polyacrylonitrile (PAN).

### Claim 5 (depends on 4)

The solid electrolyte membrane of claim 4, wherein said solid electrolyte membrane has an ionic conductivity of at least about 1 ×10−3S cm−1 at 22.6° C.

### Claim 6 (depends on 1)

The solid electrolyte membrane of claim 1, further comprising one or more fillers selected from the group consisting of Li1.3Al0.3Ti1.7(PO4)3, Li1.5Al0.5Ge1.5(PO4)3, Li7La3Zr2O12, Li0.33La0.557TiO3, Li2O—SiO2—TiO2—P2O5, Al2O3, SiO2, TiO2, BaTiO3, Ta2O5, ZrO2, Si3N4, SiC, PbTiO3, LiNbO3, AlN, and Y2O3.

### Claim 7 (depends on 6)

The solid electrolyte membrane of claim 6, wherein the one or more fillers are selected from the group consisting of Li1.3Al0.3Ti1.7(PO4)3, Li1.5Al0.5Ge1.5(PO4)3, Li7La3Zr2O12, Li0.33La0.557TiO3, and Li2O—SiO2—TiO2—P2O5.

### Claim 8 (depends on 6)

The solid electrolyte membrane of claim 6, wherein the one or more fillers are selected from the group consisting of Al2O3, SiO2, TiO2, BaTiO3, Ta2O5, ZrO2, Si3N4, SiC, PbTiO3, LiNbO3, AlN, and Y2O3.

### Claim 9 (depends on 8)

The solid electrolyte membrane of claim 8, wherein the one or more fillers are selected from the group consisting of SiO2, TiO2, and Al2O3.

### Claim 10 (depends on 1)

The solid electrolyte membrane of claim 1, wherein the solid electrolyte membrane is no more than 50 μm thick.

### Claim 11 (depends on 1)

The solid electrolyte membrane of claim 1, wherein the solid electrolyte membrane comprises between about 5 wt. % and about 35 wt. % glutaronitrile and wherein the nitrile-containing polymer is polyacrylonitrile (PAN).

### Claim 12 (depends on 11)

The solid electrolyte membrane of claim 11, wherein the solid electrolyte membrane comprises between about 15 wt. % and about 25 wt. % glutaronitrile, and the non-polarizable lithium salt is LiPF6.

### Claim 13 (depends on 1)

The solid electrolyte membrane of claim 1, wherein the solid electrolyte membrane further comprises ethylene carbonate.

### Claim 14 (depends on 13)

A battery comprising the solid electrolyte membrane of claim 13, a positive electrode, and a negative electrode.

### Claim 15 (depends on 1)

The solid electrolyte membrane of claim 1, wherein the solid electrolyte membrane consists of glutaronitrile, LiPF6, polyacrylonitrile, and ethylene carbonate.