# US 12,009,474 B2 · Electrolyte for lithium air batteries, and a lithium air battery using the same

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- Number: US 12,009,474 B2
- Document ID: US12009474B2
- Status: Granted
- Kind: B2
- Application number: 17/266,353
- Filed: 2019-08-16
- Published: 2021-10-07
- Granted: 2024-06-11
- Earliest claimed: 2018-09-04
- Assignees: National Institute for Materials Science
- Applicants: National Institute for Materials Science
- Inventors: Shoichi Matsuda
- Web page: https://patentgrep.com/patent/US12009474B2

## CPC

- H01M 4/382: {Lithium (H01M4/405 takes precedence)}
- H01M 10/056: characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M 12/08: composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type
- H01M 2300/0028: characterised by the solvent
- 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 invention relates to an electrolyte capable of improving the energy efficiency of a lithium air battery, and a lithium air battery using the electrolyte. An electrolyte for lithium air batteries according to the invention includes an amide-based organic solvent and lithium nitrate, wherein the concentration of lithium nitrate in the amide-based organic solvent satisfies a range of no less than 2 mol/L to no greater than 5.5 mol/L. A lithium air battery according to the invention includes an air electrode, a negative electrode including a lithium metal, and an electrolyte located between the air electrode and the negative electrode, wherein the electrolyte is provided by the aforesaid electrolyte.

## Claims

### Claim 1

An electrolyte for lithium air batteries, consisting essentially of an amide-based organic solvent, wherein said amide-based organic solvent is N,N-diethylformamide and/or N,N-dimethylpropionamide, and
lithium nitrate, wherein a concentration of said lithium nitrate in said amide-based organic solvent satisfies a range of no less than 3 mol/L to no greater than 5 mol/L.

### Claim 2 (depends on 1)

The electrolyte according to claim 1, which has a viscosity of no less than 0.1 Pa·s to no greater than 10 Pa·s.

### Claim 3 (depends on 1)

A lithium air battery comprising an air electrode, a metal negative electrode comprising a lithium metal, and a non-aqueous electrolyte positioned between said air electrode and said metal negative electrode, wherein said non-aqueous electrolyte is provided by the electrolyte according to claim 1.

### Claim 4 (depends on 3)

The lithium air battery according to claim 3, wherein a separator is provided between said air electrode and said metal negative electrode,
said non-aqueous electrolyte is provided between said metal negative electrode and said separator, and
said non-aqueous electrolyte or an aqueous electrolyte is provided between the said air electrode and said separator.