A kind of preparation method of ferrocyanide and its application in flow battery

Abstract

The invention discloses a preparation method of ferrocyanide and its application in liquid flow batteries, belonging to the technical field of liquid flow batteries. The preparation method provided by the invention has mild reaction conditions, and the obtained ferrocyanide has high purity and high yield. In the present invention, the cation exchange column is prepared by first eluting the cation exchange resin with the aqueous solution containing the cation of the target product, and then washing the cation exchange column with the aqueous solution of potassium ferrocyanide or sodium ferrocyanide to obtain a solution containing ferrocyanide ions . After removal of water, the ferrocyanide produced was obtained quantitatively. The ferrocyanide prepared by the above method is used to prepare the catholyte for the flow battery. The reaction conditions of the method for ferrocyanide prepared by the present invention are mild, the reaction yield is high, and the purity of the obtained ferrocyanide is high, the production yield of the preparation method provided by the invention is 100%, and the prepared ferrous cyanide Cyanide salts are 100% pure.

Description

Technical field [0001] The present invention belongs to the technical field of liquid flow cells; . Background technique [0002] With the extensive development and utilization of intermittent renewable energy such as wind energy, solar energy, reliable development of large-scale electrical storage technology has also been paid attention to. The liquid flow battery is an ideal large-scale energy storage technology. It has high energy efficiency than other energy storage technology. The energy storage is large, the cycle is long, and the depth charge and discharge, simple structure, flexible system design, safe and environmental protection The advantages of low maintenance costs can be widely used in wind energy, solar energy, energy-saving energy storage, emergency power system, backup power plant, and power system peaks. In the past few decades, the aqueous phase liquid flow battery based on inorganic energy storage materials is widely studied and developed, with all vanadium fl...

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Problems solved by technology

[0006] Although ammonium ferrocyanide and lithium ferrocyanide have good solubility and can be used in various aspects, especially in the research of various liquid batteries, due to the complicated synthesis process, it is difficult to improve the purity of the product and lack of detailed systematic research. system, it is difficult to industrialize, resulting in high prices in the market

For example, the introduction of ferrocyanide ion in the ninth volume of "Inorganic Chemistry Series" edited by Xie Gaoyang et al. reaction, or the reaction of potassium salt solution and concentrated hydrochloric acid: but the yield and purity of ferrous ammonium hydride obtained by these two methods are not high, because potassium ferrocyanide is insoluble in ether, the reaction is difficult to complete, ether Both concentrated hydrochloric acid and concentrated hydrochloric acid are highly volatile, and concentrated hydrochloric acid is highly corrosive, so this method is dangerous and toxic to a certain extent, and it is difficult to produce on a large scale

And about the synthesis of ammonium ferrocyanide and lithium ferrocyanide, bibliographical information is more rare, as J.Balmaseda etc. report titled Behavior of Prussian blue- In the article based materials in presence of ammonia, the synthesis of ammonium ferrocyanide is summarized in one sentence: ferrocyanide ion is a solid acid, which can be neutralized with ammonia water to obtain ammonium ferrocyanide: none of the reaction conditions are mentioned , so the method is difficult to generalize

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