Redox flow battery

Patent metadata

Field	Value
Publication number	US-2018212266-A1
Application number	US-201815883325-A
Country	US
Kind code	A1
Filing date	Jan 30, 2018
Priority date	Aug 5, 2016
Publication date	Jul 26, 2018
Grant date	—

Abstract

A redox flow battery is provided, including an ion-exchange membrane, a current collector plate, and an electrode that is disposed between the ion-exchange membrane and the current collector plate. The electrode includes a main electrode layer in which an electrolytic solution flows from a surface on the current collector plate side to a surface on the ion-exchange membrane side, and the main electrode layer includes a plurality of main electrode pieces which are arranged in parallel in a plane direction.

First claim

What is claimed is:

1 . A redox flow battery, comprising:
an ion-exchange membrane; a current collector plate; and an electrode that is disposed between the ion-exchange membrane and the current collector plate, wherein the electrode includes a main electrode layer having a region in which an electrolytic solution flows from a surface on the current collector plate side to a surface on the ion-exchange membrane side, and the region includes a plurality of main electrode pieces which are arranged in parallel in a plane direction.

2 . The redox flow battery according to claim 1 ,
wherein cell resistivity is 0.7 Ω·cm 2 or less.

3 . The redox flow battery according to claim 1 ,
wherein an electrolytic solution discharge passage is provided between the main electrode pieces adjacent to each other.

4 . The redox flow battery according to claim 1 ,
wherein the current collector plate includes a plurality of flow passage networks which are formed in a surface on the electrode side and through which the electrolytic solution circulates, and the main electrode pieces are respectively disposed on the plurality of flow passage networks.

5 . The redox flow battery according to claim 1 ,
wherein the main electrode pieces are constituted by a conductive sheet including a carbon nanotube having an average fiber diameter of 1 μm or less.

6 . The redox flow battery according to claim 1 ,
wherein the electrode further includes a liquid outflow layer that is disposed on the ion-exchange membrane side of the main electrode pieces.

7 . The redox flow battery according to claim 6 ,
wherein when a sheet surface of the main electrode pieces is set as a reference surface, a Darcy's rule permeability in an in-plane direction in the liquid outflow layer is greater than a Darcy's rule permeability in a normal direction of the conductive sheet.

8 . The redox flow battery according to claim 4 ,
wherein each of the plurality of flow passage networks is surrounded by a peripheral edge wall, and includes a first flow passage and a second flow passage which are formed by an inner wall, the first flow passage extends from a liquid inflow port that is formed on one end side of the peripheral edge wall toward the other end side, and the second flow passage communicates with the first flow passage, and extends in a direction of intersecting the first flow passage.

9 . The redox flow battery according to claim 6 ,
wherein the thickness of the liquid outflow layer is 0.1 mm to 0.9 mm.

10 . The redox flow battery according to claim 1 ,
wherein each of the plurality of main electrode pieces has a rectangular shape, and a length of a short side is 5 mm to 70 mm.

11 . The redox flow battery according to claim 6 ,
wherein the thickness of the liquid outflow layer is 1/150 or more times the length of the short side of the main electrode pieces.

12 . The redox flow battery according to claim 8 ,
wherein an end of each of the plurality of main electrode pieces is placed on a top surface of the peripheral edge wall.

13 . The redox flow battery according to claim 1 ,
wherein an effective area ratio is 60% or greater, and the effective area ratio is (sum of effective electrode areas of the plurality of main electrode pieces)/{(sum of the areas of the plurality of main electrode pieces)+(sum of areas of portions between the plurality of main electrode pieces)}.

14 . The redox flow battery according to claim 1 ,
wherein the electrode includes, the main electrode layer, a liquid outflow layer that is disposed between the main electrode layer and the ion-exchange membrane, and a liquid inflow layer that is disposed between the main electrode layer and a current collector.

15 . The redox flow battery according to claim 14 ,
wherein the current collector plate includes a peripheral edge wall, the liquid inflow layer is disposed between parts of the peripheral edge wall, the main electrode layer is placed on a top surface of the peripheral edge wall, and the liquid outflow layer is disposed on the main electrode layer.

16 . The redox flow battery according to claim 14 ,
wherein the main electrode layer is constituted by a conductive sheet including a carbon nanotube, and the liquid outflow layer is constituted by a carbon felt including a carbon fiber, or carbon paper.

17 . The redox flow battery according to claim 14 ,
wherein the main electrode layer is constituted by a conductive sheet including a carbon nanotube, and both of the liquid outflow layer and the liquid inflow layer are constituted by a carbon felt including a carbon fiber, or carbon paper.

Assignees

• Showa Denko Kk

Inventors

• Hanawa Kenzo
• Ichikawa Masatoshi
• Oriji Gaku
• Irwansyah
• ISEKI Keizo

Classifications

• H01M2004/8689

  Positive electrodes · CPC title

• H01M4/94

  Non-porous diffusion electrodes, e.g. palladium membranes, ion exchange membranes · CPC title

• H01M8/0234

  Carbonaceous material · CPC title

• H01M8/188 Primary

  by recharging of redox couples containing fluids; Redox flow type batteries · CPC title

• H01M2004/8684

  Negative electrodes · CPC title