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Method and system for reducing oxidation speed of electrode of flow battery

A liquid flow battery and electrode oxidation technology, which is applied in the direction of regenerative fuel cells, etc., can solve the problems of little protective electrode effect and no substantial effect

Active Publication Date: 2020-01-24
DALIAN RONGKE POWER
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  • Abstract
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Problems solved by technology

[0006] The method of increasing the flow rate at the end of charging: In previous reports, the method of increasing the flow rate of the electrolyte at the end of charging was used to reduce the charging difficulties caused by the increase in concentration polarization at the end of charging, thereby slowing down the electrode oxidation. However, this method has little effect on protecting the electrodes. Minor, no substantial effect

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  • Method and system for reducing oxidation speed of electrode of flow battery
  • Method and system for reducing oxidation speed of electrode of flow battery
  • Method and system for reducing oxidation speed of electrode of flow battery

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Embodiment Construction

[0021] In this embodiment, a method for reducing the oxidation rate of the electrodes of the flow battery is to quickly determine the overall average valence state of the positive and negative electrolytes before the SOC of the positive electrolyte reaches 85%. When the overall average valence state is ≥3.6, specifically, when the SOC of the positive electrode electrolyte is greater than 85% at the end of charging, method 1 is used to reduce the oxidation speed of the positive carbon felt electrode—the method of automatically adding a reducing agent; when When the overall valence state is <3.6, specifically, when the SOC of the positive electrode electrolyte is greater than 80%, use method 2 to reduce the oxidation rate of the positive carbon felt electrode—introduce part of the negative electrode electrolyte to the positive electrode.

[0022] Among them, the calculation method of the overall average valence state of the electrolyte is as follows:

[0023] There are four vale...

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Abstract

The invention discloses a method and system for reducing the oxidation speed of the electrode of a flow battery and belongs to the field of flow batteries and aims to solve the problem of the oxidation of the electrode of the flow battery. The method is characterized in that the method comprises a step of adding an organic reducing agent into a positive electrolyte solution. With the method and system of the invention adopted, the oxidation speed of a positive carbon felt electrode can be reduced.

Description

technical field [0001] The invention belongs to the field of liquid flow batteries, and relates to a method and a system for reducing the oxidation speed of electrodes of a liquid flow battery. Background technique [0002] All-vanadium redox flow battery has become the first choice for large-scale energy storage due to its advantages of high safety, long life, independent power capacity and convenient scale. However, the long-term operation stability of each component equipment of a large-scale MW vanadium battery project will be the main factor restricting the performance of vanadium batteries. Among them, the 10kW electric stack involves the series-parallel connection of several electric stacks, and each electric stack includes dozens of single cells in series, so the decline in the performance of any one of the batteries will directly affect the normal use of the entire electric stack, so How to improve the tolerance of a single battery, and then increase the stability ...

Claims

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Application Information

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IPC IPC(8): H01M8/18
CPCH01M8/18Y02E60/50
Inventor 高新亮张华民邹毅王晓丽张涛
Owner DALIAN RONGKE POWER
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