Method and device for purifying electrolyte of flow battery

A purification method and flow battery technology, applied in fuel cells, electrolyte flow treatment, regeneration fuel cells, etc., can solve the problems of cumbersome process, difficult to remove a variety of metal ions at one time, difficult to remove, etc., to widen the selection range, The effect of simple and easy-to-operate recovery of metallic mercury

Active Publication Date: 2020-03-03
ENERFLOW TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Although relatively high-purity vanadium electrolytes can be produced in the above-mentioned references 1 and 2, the process is cumbersome, and it may be difficult to remove the precious metal impurity elements with low content by the above-mentioned method
Reference 3 uses ion exchange resin to enrich pentavalent vanadium and then reduce it to prepare vanadium electrolyte. Although this method eliminates

Method used

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  • Method and device for purifying electrolyte of flow battery

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no. 1 approach

[0039] In the first embodiment of the present invention, a method for purifying the electrolyte of a flow battery is provided, which is characterized in that it includes the following steps:

[0040] Steps for providing an electrolytic cell having an anode, an anolyte, a cathode, and a membrane:

[0041] passing the electrolyte to be purified over the surface of the cathode;

[0042] Wherein, the cathode is metal mercury, and when the electrolytic solution to be purified passes through the surface of the cathode, a reduction reaction occurs at least in a part of the surface area of ​​the cathode under the action of an external current.

[0043] anode and anolyte

[0044] In an embodiment of the invention, the anode comprises an anode material. The anode material may include a carbon-based material having a porous structure, and the pores can form a communication structure that accommodates or allows the electrolyte to flow. The porous structure can be formed by a foaming ...

no. 2 approach

[0056] The second embodiment of the present invention relates to a purification device for electrolyte of a flow battery, which includes the following structure:

[0057] Cell;

[0058] Cathode material import / export,

[0059] Wherein, the electrolytic cell includes an anode, a cathode and a diaphragm,

[0060] the cathode is metallic mercury, and

[0061] A space is formed between the cathode surface and the separator, which space is able to accommodate the electrolyte to be purified or to allow the passage of the electrolyte to be purified.

[0062] The electrolytic cell is divided by a diaphragm into an anode part and a cathode part, and the anode part includes an anode material which is the same as that in the first embodiment of the present invention.

[0063] The cathode portion includes a cathode and a space formed between a separator and the cathode. The separator and cathode are the same as described in the first embodiment of the present invention. The space for...

Embodiment

[0093] Inject 2.5mol / L of V at a flow rate of 5L / min 3+ / V 2+ 100L hydrochloric acid solution, make it flow through the anode of the electrolytic cell composed of graphite felt and graphite bipolar plate; pass 2.5mol / L V at a flow rate of 5L / min 3+ / V 4+ Mix 100L of hydrochloric acid solution and make it flow through the cathode of the electrolytic cell composed of cavity and metal mercury, in which Ag + The content is 150ppm, Au + The content is 80ppm, Pt + The content is 20ppm, Cu 2+ The content is 200ppm. Apply 40mA / cm to the electrolytic cell 2 current, so that the anode V 2+ An oxidation reaction occurs, and a reduction reaction occurs on impurity metal ions at the cathode. A pump is used to circulate the electrolyte of the anode and cathode through the electrolytic cell five times to achieve the purpose of removing impurity metal ions to the greatest extent. The content of each impurity in the purified catholyte is lower than 1ppm.

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Abstract

The invention relates to a method and a device for purifying electrolyte of a flow battery. According to the method of purifying electrolyte of a flow battery, harmful metal ions can be simply, effectively and selectively removed, harmful side reactions are avoided, the production cost of the electrolyte is greatly reduced, the selection range of initial raw materials is greatly widened, and the method has extremely high practical application value. Moreover, the purification device for the electrolyte can be connected with a device for preparing to-be-purified electrolyte, and the high-purityelectrolyte is obtained from low-purity raw materials at a time.

Description

technical field [0001] The invention relates to a purification method and a purification device for the electrolyte of a redox flow battery, in particular to a method and a device for purifying the electrolyte of an all-vanadium redox flow battery. Background technique [0002] Flow battery technology has the natural advantage of large-scale energy storage: the amount of stored electricity is linearly proportional to the volume of the electrolyte, and the charge and discharge power is determined by the size and quantity of the stack, so it can be designed according to the needs, ranging from kW to MW. Charge and discharge power, flow batteries with different energy storage volumes that can be continuously discharged for 1 hour to several days. Based on commonly used inorganic acids and inorganic salts, the electrolyte has a stable chemical composition, is easy to store, has little impact on the environment, and has an extremely low self-discharge coefficient, making it suita...

Claims

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Application Information

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IPC IPC(8): H01M8/04276H01M8/18
CPCH01M8/04276H01M8/188H01M8/18Y02E60/50
Inventor 祖革王瑾郑晓昊
Owner ENERFLOW TECH CO LTD
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