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Purification method of iron-chromium electrolyte and iron-chromium electrolyte obtained by purification method

A purification method and electrolyte technology, which is applied in the field of purified iron-chromium electrolyte and iron-chromium electrolyte, can solve problems such as hydrogen evolution, occurrence, and electrolyte failure, and achieve the goals of avoiding harmful side reactions, reducing costs, and ensuring purity Effect

Active Publication Date: 2021-10-29
ENERFLOW TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the charge and discharge process of the electrolyte prepared from raw materials of industrial purity, some metal ion impurities such as silver, gold, platinum, nickel, copper, etc. will cause side reactions of the flow battery, such as hydrogen evolution reaction, and generate a large amount of dangerous gases. , so that the electrolyte quickly loses
[0005] In addition, although different methods have been used to prepare the electrolyte of the iron-chromium flow battery for various purposes, due to the entry and entry of other metal impurity ions from the raw materials and process, therefore, in When such an electrolyte is actually used, there is still the problem of hydrogen evolution over time.

Method used

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  • Purification method of iron-chromium electrolyte and iron-chromium electrolyte obtained by purification method

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Experimental program
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Effect test

no. 1 approach

[0043]In the first embodiment of the present invention, a method for purifying an iron-chromium electrolyte for a flow battery is provided, which is characterized in that it includes the following steps:

[0044] Steps for providing an electrolytic cell having an anode, an anolyte, a cathode, and a membrane:

[0045] The step of passing the iron-chromium electrolyte to be purified through the surface of the cathode;

[0046] Wherein, the cathode includes metallic mercury and a porous conductive material, and when the iron-chromium electrolyte to be purified passes through the surface of the cathode, a reduction reaction occurs at least in part of the surface area of ​​the cathode under the action of an external current.

[0047] anode and anolyte

[0048] 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 accommodate...

no. 2 approach

[0079] The second embodiment of the present invention relates to a purification device for iron-chromium electrolyte, comprising the following structure:

[0080] Cell;

[0081] Cathode material import / export,

[0082] Wherein, the electrolytic cell includes an anode, a cathode and a diaphragm,

[0083] the cathode comprises metallic mercury and a porous conductive material, and

[0084] A space is formed between the cathode surface and the separator, which space is able to accommodate or allow the passage of the iron-chromium electrolyte to be purified.

[0085] 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.

[0086] 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...

Embodiment 1

[0112] In addition to introducing graphite felt, the electrode surface area of ​​the cathode is increased to about 1100 cm 2 1. Except that the flow velocity of the iron-chromium electrolyte becomes 1L / min, the iron-chromium negative electrode electrolyte after purification in Comparative Example 1 is further purified using the same purification device and method as in Comparative Example 1.

[0113] After further purification, the impurity contents of various metal ions in the iron-chromium electrolyte are as follows: Cu content is 10ppb, Ni content is 15ppb, Pt content is 3ppb, Au content is 0, Ag content is 8ppb, and the total content is 36ppb.

[0114] After the iron-chromium electrolyte is purified by purification equipment, it is loaded with a conventional reaction area of ​​25cm 2 , the positive and negative liquid storage bottles are respectively 150ml liquid flow cells for charge and discharge cycles.

[0115] The battery is continuously charged and discharged, and t...

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Abstract

The invention relates to a purification method of an iron-chromium electrolyte and the iron-chromium electrolyte obtained by the purification method. According to the purification method of the iron-chromium electrolyte, harmful metal ions can be simply and effectively removed, hydrogen evolution side reaction is avoided, the production cost of the electrolyte is greatly reduced, and the purification method has extremely high practical application value.

Description

technical field [0001] The invention relates to a method for purifying an electrolyte of a flow battery, in particular to a method for purifying an iron-chromium electrolyte, and the iron-chromium electrolyte obtained therefrom. 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 suitable for long-term el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D21/00C25D3/56C25B1/01H01M8/18
CPCC25D21/00C25D3/562C25B1/01H01M8/188Y02E60/50Y02P70/50H01M8/18C25C1/20C25C1/08C25C1/12C25C7/02C25B11/02C25B11/051C25B11/075C25B11/065
Inventor 王瑾郑晓昊
Owner ENERFLOW TECH CO LTD
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