Lithium oxygen battery and electrolyte composition

Patent metadata

Field	Value
Publication number	US-9666918-B2
Application number	US-201414228653-A
Country	US
Kind code	B2
Filing date	Mar 28, 2014
Priority date	Mar 28, 2014
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

A battery employing lithium-oxygen chemistry may include an anode comprising lithium, an electrolyte, and a porous cathode. The electrolyte may include a lithium-containing salt; a partially fluorinated ether, such as 2,2-bis(trifluoromethyl)-1,3-dioxolane; and a co-solvent selected from the group consisting of ethers, amides, nitriles, and combinations thereof. In some examples, the electrolyte does not include a cyclic carbonate ester, a sulfolane, or a sulfolane derivative. The porous cathode allows oxygen to come into contact with the electrolyte.

First claim

The invention claimed is:

1. A battery employing lithium-oxygen chemistry comprising:
an anode comprising lithium;
an electrolyte comprising:
a lithium-containing salt,
2,2-bis(trifluoromethyl)-1,3-dioxolane, and
a co-solvent selected from the group consisting of ethers, amides, nitriles, and combinations thereof, wherein the electrolyte does not include a cyclic carbonate ester, a sulfolane, or a sulfolane derivative; and

a porous cathode allowing oxygen to come into contact with the electrolyte.

2. The battery of claim 1 , wherein the volume ratio of 2,2-bis(trifluoromethyl)-1,3-dioxolane to the co-solvent is between about 30:1 and about 1:1.

3. The battery of claim 1 , wherein the volume ratio of 2,2-bis(trifluoromethyl)-1,3-dioxolane to the co-solvent is between about 30:1 and about 5:1.

4. The battery of claim 1 , wherein the volume ratio of 2,2-bis(trifluoromethyl)-1,3-dioxolane to the co-solvent is between about 20:1 and about 10:1.

5. The battery of claim 1 , wherein the lithium salt is selected from the group consisting of LiPF 6 , LiClO 4 , LiTFSI, LiBF 4 , LiAsF 6 , LiN(SO 2 CF 3 ) 2 , LiSO 3 CF 3 , and combinations thereof.

6. The battery of claim 1 , wherein the co-solvent is selected from the group consisting of 1,2-dimethoxyethane, diglyme, triglyme, tetraglyme, N-methyl-2-pyrrolidone (NMP), dimethyl acetamide, pivalonitrile, acetonitrile, and combinations thereof.

7. The battery of claim 1 , wherein the electrolyte consists essentially of the lithium-containing salt; 2,2-bis(trifluoromethyl)-1,3-dioxolane; and the co-solvent.

Assignees

• IBM
• Central Glass Co Ltd

Inventors

• Kang Seok J
• Mccloskey Bryan D
• Mori Takashi
• Narizuka Satoru
• Wallraff Gregory M

Classifications

• H01M12/08 Primary

  composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type · CPC title

• H01M4/382

  Lithium (H01M4/405 takes precedence) · CPC title

• Y02E60/128

  Cross-Sectional Technologies · mapped topic

• H01M2300/0034

  Fluorinated solvents · CPC title

• H01M2300/0028

  characterised by the solvent · CPC title