Electrolyte for iron-air batteries and iron-air battery

Patent metadata

Field	Value
Publication number	US-2017077571-A1
Application number	US-201615258487-A
Country	US
Kind code	A1
Filing date	Sep 7, 2016
Priority date	Sep 10, 2015
Publication date	Mar 16, 2017
Grant date	—

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, S 2 O 3 2− anions and (CH 3 ) 2 NCSS − anions.

First claim

1 . An electrolyte for iron-air batteries having an anode containing an iron element, the electrolyte comprising an aqueous solution comprising a discharge reaction promoter containing at least one kind of anion selected from the group consisting of SCN − anions, S 2 O 3 2− anions and (CH 3 ) 2 NCSS − anions.

2 . The electrolyte for iron-air batteries according to claim 1 , wherein the discharge reaction promoter comprises at least one kind of cation selected from the group consisting of Li + cations, K + cations, Na + cations, Rb + cations, Cs + cations and Fr + cations.

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

4 . The electrolyte for iron-air batteries according to claim 1 , wherein a concentration of the discharge reaction promoter is in a range of 0.005 mol/L to 0.1 mol/L.

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

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

7 . An iron-air battery comprising:
an air electrode configured to receive an oxygen supply; an anode containing an iron element; and an electrolyte defined by claim 1 , the electrolyte being in contact with the air electrode and the anode.

Assignees

• Toyota Motor Co Ltd

Inventors

• Suyama Hiroshi
• Wakayama Kazushi
• Kuroki Tomohiro

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

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M12/06

  with one metallic and one gaseous electrode · CPC title

• H01M4/248

  Iron electrodes · CPC title

• H01M2300/0002

  Aqueous electrolytes · CPC title