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Electrodes, flow batteries and flow battery stacks

A liquid flow battery and electrode technology, which is applied in the direction of fuel cells, battery electrodes, regenerative fuel cells, etc., can solve the problems of low voltage efficiency of liquid flow batteries, and achieve the effects of increasing reaction current density, voltage efficiency, and power density

Active Publication Date: 2019-01-08
DONGFANG ELECTRIC (CHENGDU) HYDROGEN FUEL CELL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide an electrode, a flow battery and a flow battery stack to solve the problem of low voltage efficiency of the flow battery in the prior art

Method used

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  • Electrodes, flow batteries and flow battery stacks
  • Electrodes, flow batteries and flow battery stacks
  • Electrodes, flow batteries and flow battery stacks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The liquid flow battery provided in this embodiment is as image 3 As shown, it includes a bipolar plate, a liquid flow frame, an electrode and an ion exchange membrane, wherein the electrode includes a first electrode layer and a second electrode layer disposed on the first surface of the first electrode layer, and the second electrode layer is close to the ion The exchange membrane is set, the ratio of the number of reactive sites of the second electrode layer to the first electrode layer is 1.05:1, and the ratio of the specific surface area per unit volume of the second electrode layer to the first electrode layer is 1.05:1;

[0050] Wherein, the material forming the bipolar plate is a graphite plate, the ion exchange membrane is a perfluorosulfonic acid membrane, the material forming the first electrode layer is unmodified carbon felt, and the material forming the second electrode layer is charcoal paper.

Embodiment 2

[0052] The liquid flow battery provided in this embodiment is as Figure 4 As shown, it includes a bipolar plate, a liquid flow frame, an electrode and an ion exchange membrane, wherein the electrode includes a first electrode layer and a third electrode layer disposed on the second surface of the first electrode layer, and the third electrode layer is close to the bipolar The electrode plate is set, the ratio of the number of reactive sites of the third electrode layer to the first electrode layer is 1.05:1, and the ratio of the specific surface area per unit volume of the third electrode layer to the first electrode layer is 1.05:1;

[0053] Wherein, the material forming the bipolar plate is a graphite plate, the ion exchange membrane is a perfluorosulfonic acid membrane, the material forming the first electrode layer is unmodified carbon felt, and the material forming the third electrode layer is charcoal paper.

Embodiment 3

[0055] The liquid flow battery provided in this embodiment is as Figure 5 As shown, it includes a bipolar plate, a liquid flow frame, an electrode and an ion exchange membrane, wherein the electrode includes a first electrode layer, a second electrode layer disposed on the first surface, and a third electrode disposed on the second surface Layer, the second electrode layer is set close to the ion exchange membrane, the third electrode layer is set close to the bipolar plate, the ratio of the number of reactive sites of the third electrode layer, the second electrode layer and the first electrode layer is 1.05:1.05:1 , and the ratio of the specific surface area per unit volume of the third electrode layer, the second electrode layer and the first electrode layer is 1.05:1.05:1;

[0056] Wherein, the material forming the bipolar plate is a graphite plate, the ion exchange membrane is a perfluorosulfonic acid membrane, the material forming the first electrode layer is unmodified...

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Abstract

The invention provides an electrode, a flow cell and a flow cell stack. The electrode comprises a first electrode layer, wherein the first electrode layer is provided with a first surface and a second surface that are opposite; the electrode also comprises a second electrode layer arranged on the first surface and / or a third electrode layer arranged on the second surface; the number of the reaction active sites of the second electrode layer is greater than that of the reaction active sites of the first electrode layer; and the number of the reaction active sites of the third electrode layer is greater than that of the reaction active sites of the first electrode layer. After the electrode is applied to the flow cell, compared with the rest regions, the region, close to an ion exchange membrane and / or a bipolar plate, in the electrode layer group has a larger number of the reaction active sites, so that the number of the reaction active sites in the electrode can satisfy the requirement of the flow cell on the basis of not increasing the electrode thickness; in addition, the amplification of the battery internal resistance can be effectively lowered by adjusting the thickness of the electrode; and the voltage efficiency of the flow cell is improved.

Description

technical field [0001] The present invention relates to the technical field of flow batteries, in particular, to an electrode, a flow battery and a flow battery stack. Background technique [0002] Due to the separation of the electrolyte for energy storage and the battery stack for energy conversion, flow batteries have the advantages of high safety, flexible power and capacity design, long life, and low maintenance costs, and have been widely used in various energy storage fields. . [0003] For the existing flow battery stack, on the one hand, in order to improve the voltage efficiency of the battery, it is necessary to reduce the internal resistance of the battery, and then it is necessary to reduce the thickness of the electrode or increase the number of reactive sites of the electrode; on the other hand, in order to improve The power density of the battery needs to be increased to increase the current density. In order for the battery to withstand a greater current de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/96H01M8/18H01M8/241
CPCH01M4/96H01M8/188H01M8/241Y02E60/50
Inventor 李扬汤浩周正刘佳燚高艳殷聪
Owner DONGFANG ELECTRIC (CHENGDU) HYDROGEN FUEL CELL TECH CO LTD