Electrolyte for iron-air batteries and iron-air battery

Patent metadata

Field	Value
Publication number	US-10044082-B2
Application number	US-201615258487-A
Country	US
Kind code	B2
Filing date	Sep 7, 2016
Priority date	Sep 10, 2015
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

An electrolyte for iron-air batteries, which is able to increase the discharge capacity of iron-air batteries without concentration control, and an iron-air battery using the electrolyte. The electrolyte for iron-air batteries having an anode containing an iron element may comprise an aqueous solution comprising a discharge reaction promoter containing at least one kind of anion selected from the group consisting of SCN− anions, S2O32− anions and (CH3)2NCSS− anions.

First claim

The invention claimed is:

1. An electrolyte for iron-air batteries having an anode containing an iron element, the electrolyte comprising:
an aqueous solution comprising at least one kind of discharge reaction promoter selected from the group consisting of NaSCN, Na 2 S 2 O 3 , and (CH 3 ) 2 NCSSNa,
wherein a concentration of the discharge reaction promoter is in a range of 0.005 mol/L to 0.1 mol/L.

2. The electrolyte for iron-air batteries according to claim 1 , wherein the discharge reaction promoter is Na 2 S 2 O 3 .

3. The electrolyte for iron-air batteries according to claim 1 , wherein the aqueous solution is basic.

4. The electrolyte for iron-air batteries according to claim 1 , wherein the aqueous solution comprises KOH as an electrolyte compound.

5. An iron-air battery comprising:
an air electrode configured to receive an oxygen supply;
an anode containing an iron element; and
an electrolyte in contact with the air electrode and the anode, the electrolyte comprising:
an aqueous solution comprising at least one kind of discharge reaction promoter selected from the group consisting of NaSCN, Na 2 S 2 O 3 , and (CH 3 ) 2 NCSSNa,
wherein a concentration of the discharge reaction promoter is in a range of 0.005 mol/L to 0.1 mol/L.

6. The electrolyte for ion-air batteries according to claim 1 , wherein the discharge reaction promoter is (CH 3 ) 2 NCSSNa.

7. The iron-air battery according to claim 5 , wherein the discharge reaction promoter is Na 2 S 2 O 3 .

8. The iron-air battery according to claim 5 , wherein the aqueous solution is basic.

9. The iron-air battery according to claim 5 , wherein the aqueous solution comprises KOH as an electrolyte compound.

10. The iron-air battery according to claim 5 , wherein the discharge reaction promoter is (CH 3 ) 2 NCSSNa.

Assignees

• Toyota Motor Co Ltd

Inventors

• Suyama Hiroshi
• Wakayama Kazushi
• Kuroki Tomohiro

Classifications

• H01M4/52

  of nickel, cobalt or iron · CPC title

• H01M4/38

  of elements or alloys · CPC title

• H01M4/248

  Iron electrodes · CPC title

• H01M12/06

  with one metallic and one gaseous electrode · 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