Electrode for redox flow battery, and redox flow batteries

Patent metadata

Field	Value
Publication number	US-11069901-B2
Application number	US-201716076132-A
Country	US
Kind code	B2
Filing date	Jan 12, 2017
Priority date	Feb 10, 2016
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

An electrode for a redox flow battery includes a substrate, a conductive portion applied to a surface of the substrate, and a catalytic portion held by the conductive portion, the conductive portion containing one or more types of elements selected from the group α1 consisting of Sn, Ti, Ta, Ce, In, and Zn, the catalytic portion containing one or more types of elements selected from the group β consisting of Ru, Ir, Pd, Pt, Rh, and Au.

First claim

The invention claimed is:

1. An electrode for a redox flow battery, comprising:
a substrate;
a conductive portion applied to a surface of the substrate; and
a catalytic portion held by the conductive portion,
the conductive portion containing one or more types of elements selected from a group α1 consisting of Sn, Ti, Ta, Ce, In, and Zn,
the catalytic portion containing one or more types of elements selected from a group β consisting of Ru, Ir, Pd, Pt, Rh, and Au,
wherein the substrate comprises an aggregate of particles, the particles included in the aggregate have an average particle size of 3 μm or more and 500 μm or less, and the substrate contains one or more types of elements selected from Ti, Ta, and Nb.

2. The electrode for a redox flow battery according to claim 1 , wherein a molar ratio of a total constituent element content of the conductive portion and a total constituent element content of the catalytic portion is 30:70 to 95:5.

3. The electrode for a redox flow battery according to claim 1 , wherein the conductive portion contains one or more types of elements selected from a group α2 consisting of Nb, Sb, Bi, and P.

4. The electrode for a redox flow battery according to claim 3 , wherein the conductive portion has with respect to its total constituent element content a total group α2 constituent element content of 1 mol% or more and 20 mol% or less.

5. The electrode for a redox flow battery according to claim 1 , wherein the substrate comprises an aggregate of fibers each having a transverse cross section of 3 μm or more and 100 μm or less as converted into an equivalent circle diameter.

6. The electrode for a redox flow battery according to claim 1 , wherein the substrate has a porosity of more than 40% by volume and less than 98% by volume.

7. The electrode for a redox flow battery according to claim 1 , having a weight per unit area of 50 g/m 2 or more and 10000 g/m 2 or less.

8. The electrode for a redox flow battery according to claim 1 , having a thickness of 0.1 mm or more and 5 mm or less.

9. A redox flow battery electrically charged/discharged as a positive electrode electrolyte and a negative electrode electrolyte are supplied to a battery cell comprising a positive electrode, a negative electrode, and a diaphragm interposed between the positive electrode and the negative electrode,
the positive electrode being the electrode for a redox flow battery according to claim 1 ,
the negative electrode being a carbon fiber aggregate.

10. The redox flow battery according to claim 9 , wherein the positive electrode electrolyte and the negative electrode electrolyte contain an active material having an oxidation-reduction potential of 0.9 V or more.

11. An electrode for a redox flow battery, comprising:
a substrate;
a conductive portion applied to a surface of the substrate; and
a catalytic portion held by the conductive portion,
the conductive portion containing one or more types of elements selected from a group α1 consisting of Sn, Ti, Ta, Ce, In, and Zn,
the catalytic portion containing one or more types of elements selected from a group β consisting of Ru, Ir, Pd, Pt, Rh, and Au,
wherein the substrate comprises an aggregate of particles, and the particles included in the aggregate have an average particle size of 3 μm or more and 500 μm or less.

Assignees

• Sumitomo Electric Industries

Inventors

• Nakaishi Hiroyuki
• Kaku Hirokazu
• Mukobata Shinichiro
• Utsumi Tomomi
• Sato Megumi

Classifications

• H01M4/92

  Metals of platinum group (H01M4/94 {, H01M4/9058} take precedence) · CPC title

• H01M4/96

  Carbon-based electrodes · CPC title

• H01M4/8621

  containing only metallic or ceramic material, e.g. made by sintering or sputtering · CPC title

• H01M4/8673

  Electrically conductive fillers · CPC title

• H01M2004/8689

  Positive electrodes · CPC title