# US 12,218,334 B2 · Potassium secondary battery

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- Number: US 12,218,334 B2
- Document ID: US12218334B2
- Status: Granted
- Kind: B2
- Application number: 16/959,937
- Filed: 2019-01-02
- Published: 2021-07-08
- Granted: 2025-02-04
- Earliest claimed: 2018-01-03
- Assignees: Ohio State Innovation Foundation
- Applicants: Ohio State Innovation Foundation
- Inventors: Yiying Wu; Neng Xiao; William McCulloch
- Web page: https://patentgrep.com/patent/US12218334B2

## CPC

- H01M 12/08: composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type
- H01M 4/381: {Alkaline or alkaline earth metals elements (H01M4/40 takes precedence)}
- H01M 4/8605: {Porous electrodes}
- H01M 4/8673: {Electrically conductive fillers}
- H01M 4/9016: {Oxides, hydroxides or oxygenated metallic salts}
- H01M 10/0564: the electrolyte being constituted of organic materials only
- H01M 10/0568: characterised by the solutes
- H01M 12/02: Details (of electrodes H01M4/00; of non-active parts H01M50/00)
- H01M 4/483: {for non-aqueous cells (H01M4/485 takes precedence)}
- H01M 4/5815: {Sulfides}
- H01M 4/582: {Halogenides}
- H01M 4/583: Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 2004/027: {Negative electrodes}
- H01M 2004/8689: {Positive electrodes}
- H01M 2300/0025: Organic electrolyte
- 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

The present technology is directed to a potassium metal battery, particularly a potassium metal secondary battery, that includes a cathode; an anode that includes potassium metal; and a non-aqueous electrolyte that includes a potassium salt as well as a solvent. The solvent may include dimethoxyethane, digylme, triglyme, tetraglyme, or a mixture of any two or more thereof.

## Claims

### Claim 1

A battery comprising
a cathode;
an anode comprising potassium metal; and
a first non-aqueous electrolyte comprising bis(trifluoromethanesulfonyl)imide (KTFSI) and a first solvent, wherein the KTFSI is at a concentration in the first non-aqueous electrolyte of about 0.3 M to about 1.0 M;
wherein
the potassium metal is provided by electrodeposition of potassium ions in a second non-aqueous electrolyte comprising potassium bis(fluorosulfonyl)imide (KFSI) and a second solvent comprising dimethoxyethane.

### Claim 2 (depends on 1)

The battery of claim 1, wherein the first non-aqueous electrolyte comprises less than 0.01M KFSI.

### Claim 3 (depends on 1)

The battery of claim 1, wherein the first solvent comprises dimethoxyethane, digylme, triglyme, tetraglyme, or a mixture of any two or more thereof.

### Claim 4 (depends on 1)

The battery of claim 1, wherein the cathode comprises a potassium-containing positive electroactive material.

### Claim 5 (depends on 1)

The battery of claim 1, wherein the cathode comprises a potassium-containing olivine-based material, a fluorinated olivine-based material, a potassium-containing iron-cyano complex, a potassium-containing transition metal oxide, a potassium-containing transition metal sulfide, a potassium-containing transition metal halide, or a combination of any two or more thereof.

### Claim 6 (depends on 1)

The battery of claim 1, wherein the cathode is an air cathode.

### Claim 7 (depends on 6)

The battery of claim 6, wherein the air cathode comprises a porous carbon material.

### Claim 8 (depends on 6)

The battery of claim 6, wherein the air cathode further comprises a metal oxide.

### Claim 9 (depends on 6)

The battery of claim 6, wherein the cathode further comprises a binder.

### Claim 10

An anode for a battery comprising potassium metal that is provided by electrodeposition of potassium ions in a non-aqueous electrolyte comprising potassium bis(fluorosulfonyl)imide (KFSI) and a solvent comprising dimethoxyethane, wherein the KFSI is at a concentration in the non-aqueous electrolyte of about 0.9 M to about 10 M.

### Claim 11 (depends on 10)

The anode of claim 10, wherein the non-aqueous electrolyte is substantially free of potassium salts that are not KFSI prior to electrodeposition.

### Claim 12 (depends on 1)

The battery of claim 1, wherein the second non-aqueous electrolyte is substantially free of potassium salts that are not KFSI prior to electrodeposition.

### Claim 13 (depends on 1)

The battery of claim 1, wherein the first non-aqueous electrolyte is substantially free of potassium salts that are not KTFSI prior to initial discharge.

### Claim 14 (depends on 1)

The battery of claim 1, wherein the KFSI is at a concentration in the second non-aqueous electrolyte of about 0.9 M to about 10 M.