A kind of preparation method of vanadium battery electrolyte based on vanadium compound

Abstract

The invention relates to a method for preparing a vanadium compound-based electrolyte for a vanadium battery. Its technical scheme is: mix the vanadium compound, supporting electrolyte, reducing agent or oxidizing agent and deionized water, heat and stir, separate the solid and liquid, collect the liquid phase, and obtain the electrolyte I; put the anode composite electrode and the cathode composite electrode in The positive terminal and negative terminal corresponding to the capacitive deionization device, under the condition of 0.5 ~ 3V DC voltage, the electrolyte I is circulated and pumped into the capacitive deionization device to obtain the electrolyte II; the electrolyte II is placed in the negative electrode chamber of the electrolytic cell, Enter the sulfuric acid solution with the same acidity as the electrolyte II in the positive electrode chamber of the electrolytic cell, and conduct constant current electrolysis under the condition of a current of 1-5A until the valence state of the electrolyte is 3.5 to obtain the electrolyte III; add the above-mentioned The chelating agent is mixed evenly to obtain the vanadium battery electrolyte. The invention has the advantages of low cost, simple process, environmental friendliness and easy industrial production, and the prepared vanadium battery electrolyte has good electrochemical performance and excellent stability.

Description

technical field [0001] The invention belongs to the technical field of vanadium battery electrolyte. In particular, it relates to a method for preparing a vanadium compound-based electrolyte for a vanadium battery. Background technique [0002] Vanadium battery is a new type of green and pollution-free chemical energy storage battery. Compared with other energy storage batteries, vanadium battery has long operating life, low operation and maintenance costs, high reliability, strong safety and easy large-scale application. As an important part of the battery, the vanadium battery electrolyte is the energy storage active material of the battery. The performance of the vanadium battery electrolyte directly determines the performance of the vanadium battery. Therefore, the development of a method for preparing a vanadium battery electrolyte with good performance and low cost is of great significance for the industrialization and large-scale development of vanadium batteries. ...

AI Technical Summary

Problems solved by technology

The above-mentioned technologies use vanadium slag as a raw material. Although the cost of raw materials is low, the vanadium slag contains a large amount of impurity ions, which requires a complex impurity removal process and a long process flow; and the need to add reducing agents, acid, and lye makes the cost relatively high. High, and produce waste water to pollute the environment

[0006] In summary, solid vanadium compounds such as vanadium pentoxide or vanadyl sulfate with a purity higher than 99.5% are generally used to prepare vanadium battery electrolytes at present, which has the problem of high production costs; and the use of cheap vanadium raw materials to prepare electrolytic liquid, it needs to go through multiple extractions or ion exchange to remove impurities, vanadium precipitation, sulfuric acid dissolution and other processes, and there are problems such as complex process and waste water pollution.

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