Production technology and system of vanadium redox battery electrolyte

Abstract

The invention discloses production technology and system of vanadium redox battery electrolyte, and belongs to the technical field of vanadium redox battery preparation. The production technology comprises the following steps: (1) adding vanadium pentoxide into a sulfuric acid solution, and stirring to obtain suspension slurry; (2) introducing liquid-state SO2 into the suspension slurry to obtaina mixed solution of VOSO4 and V2(SO4)3; (3) dividing the mixed solution of VOSO4 and V2(SO4)3 into two parts which are separately added into an anode region and a cathode region of a diaphragm electrolyzer, wherein positive electrolyte of the vanadium redox battery is obtained in the anode region, and negative electrolyte of the vanadium redox battery is obtained in the cathode region. According to the production technology disclosed by the invention, liquid-state SO2 is adopted as a reducing agent, and the suspension slurry prepared from sulfuric acid and vanadium pentoxide is directly subjected to liquid-phase reduction in a pressure reaction kettle; then, the positive and negative electrolyte of the vanadium redox battery is prepared in one step by the diaphragm electrolyzer while impurity elements are not introduced, byproducts are avoided, the reaction process is stable and efficient, the raw materials are widely available, the flow is simple and industrial production is easy to implement.

Description

technical field [0001] The invention belongs to the technical field of vanadium battery preparation, and in particular relates to a production process and system of a vanadium battery electrolyte. Background technique [0002] All-vanadium redox flow battery (referred to as vanadium battery) is a new type of secondary battery. Because of its low cost, high safety, relatively simple process, and independence of power and energy, it is used in power plants (power stations) before peak regulation. It has broad application prospects in areas such as load balancing, energy storage power for wind power generation, large-scale photoelectric conversion, and energy storage systems in remote areas. The key technology of vanadium battery lies in three aspects: electrode material, battery diaphragm and electrolyte. Electrolyte is the active substance of the electrochemical reaction of vanadium battery and the carrier of electric energy. Its quality has a direct impact on battery perform...

AI Technical Summary

Problems solved by technology

[0004] (1) The addition of the reducing agent inevitably introduces impurities into the electrolyte, which affects the quality of the electrolyte, thereby affecting the stability and durability of the all-vanadium redox flow battery

[0005] (2) Since the vanadium electrolyte is obtained by dissolving and reducing vanadium oxide in sulfuric acid, the amount of reducing agent added is not easy to control, and the valence state of vanadium element is difficult to stabilize, and most of them are mixed valence states

[0006] (3) High-purity vanadium pentoxide, the raw material required for the production of vanadium electrolyte, has a complex process and high cost, resulting in high production costs of commercial vanadium electrolyte, which is also the reason for its difficulty in wide-scale application

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