Ionic liquid electrolyte and fluorinated carbon electrode

Patent metadata

Field	Value
Publication number	US-10205207-B2
Application number	US-201414761589-A
Country	US
Kind code	B2
Filing date	Feb 28, 2014
Priority date	Feb 28, 2013
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

The invention relates to an electrolyte for a metal air battery, and in particular, to an ionic liquid electrolyte for a metal air battery. The ionic liquid electrolyte includes an additive to improve oxygen solubility thereof. The invention also define a method of impregnating a fluorinated carbon compound into an electrode comprising depositing onto the electrode a dispersion comprising the fluorinated carbon compound dissolved in an organic solvent and placing the electrode in an inert environment.

First claim

The invention claimed is:

1. An electrolyte for a metal air battery, comprising:
a solvent comprising:
a base solvent, wherein the base solvent is an ionic liquid;
a bridging solvent, wherein the bridging solvent is an organic solvent; and

a solute consisting essentially of:
an electron neutral fluorinated carbon compound; and
a metal salt selected from the group consisting of LiClO 4 , LiBr, LiI, LiAlCl 4 , and combinations thereof,

wherein the electron neutral fluorinated carbon compound has a general formula R1-(C n F 2n )—R2, wherein each of R1and R2 is independently F, H, C 1 -C 5 alkyl, C 1 -C 5 alkoxy, or C n F 2p+1 , and 1≤n≤20, and 1≤p≤20.

2. The electrolyte of claim 1 , wherein 1≤n≤10.

3. The electrolyte of claim 1 , wherein 1≤p≤10.

4. The electrolyte of claim 1 , wherein at least one of R1 and R2 is F.

5. The electrolyte of claim 1 , wherein at least one of R1 and R2 is C 1 -C 5 alkyl or C 1 -C 5 alkoxy.

6. The electrolyte of claim 5 , wherein n is 3 and R1 is F and R2 is C 1 -C 5 oxyalkyl.

7. The electrolyte of claim 6 , wherein the electron neutral fluorinated carbon compound has the formula CF 3 CF 2 CF 2 OCH 3 (1-methoxyheptafluoropropane).

8. The electrolyte of claim 1 , wherein the bridging solvent comprises an ether.

9. The electrolyte of claim 8 , wherein the bridging solvent comprises 1,2-dimethoxyethane (DME, CH 3 OCH 2 CH 2 OCH 3 ) or tetraethyleneglycol dimethyl ether (TEGDME, CH 3 O(CH 2 CH 2 O) 4 CH 3 ).

10. The electrolyte of claim 1 , wherein the ionic liquid comprises bis(trifluoromethanesulfone)imide (TFSI) anion.

11. The electrolyte of claim 10 , wherein the ionic liquid comprises 1-methyl-1-butyl-pyyrolidinium bis(trifluoromethanesulfone)imide (PYR14TFSI).

12. The electrolyte of claim 1 , wherein the metal salt is LiClO 4 (lithium perchlorate).

13. A metal air battery comprising an electrolyte comprising:
a solvent comprising:
a base solvent, wherein the base solvent is an ionic liquid;
a bridging solvent, wherein the bridging solvent is an organic solvent; and

a solute consisting essentially of
an electron neutral fluorinated carbon compound; and
a metal salt selected from the group consisting of LiClO 4 , LiBr, LiI, LiAlCl 4 , and combinations thereof

wherein the electron neutral fluorinated carbon compound has a general formula R1-(C n F 2n )—R2, wherein each of R1 and R2 is independently F, H, C 1 -C 5 alkyl, C 1 -C 5 alkoxy, or C n F 2p+1 , and 1≤n≤20, and 1≤p≤20.

Assignees

• Univ Nanyang Tech

Inventors

• Wijaya Olivia
• Yazami Rachid

Classifications

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M2300/0028

  characterised by the solvent · CPC title

• H01M12/08 Primary

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

• H01M2300/0045

  Room temperature molten salts comprising at least one organic ion · CPC title