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Method for preparing positive electrolyte of all-vanadium redox flow battery through chemical synthesis method

A technology of all-vanadium redox flow battery and chemical synthesis method, which is applied in the direction of regenerative fuel cells, etc., can solve the problems of unfavorable large-scale promotion of vanadium batteries and high price, and achieve good charge and discharge performance and simple preparation route.

Inactive Publication Date: 2015-08-19
SHENZHEN SINOCREDO NEW ENERGY TECH
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Problems solved by technology

Although VOSO4 can be directly used as the initial electrolyte of vanadium batteries, its price is very expensive, which is not conducive to the large-scale promotion of vanadium batteries

Method used

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  • Method for preparing positive electrolyte of all-vanadium redox flow battery through chemical synthesis method

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Embodiment Construction

[0015] The following takes the first method—that is, the preparation of vanadium-containing ore—as an example to describe the preparation method of the vanadium battery electrolyte.

[0016] Dissolve and activate V2O5 in H2SO4 first, then reduce V(+5) to V(+4) with medium-strong reducing agent, and dehydrate and dry the solution to obtain pure blue VOSO4·nH2O. According to the different reducing agents used in the preparation process of VOSO4, it can be divided into the following preparation methods:

[0017] (1) V2O5——H2SO4——oxalic acid, citrate, sucrose, hydrazine, formic acid, and acetic acid method. The reducing agent of this method is all organic matter, the reducing ability is weak, the reaction speed is slow, and CO2 is produced, and the reagent consumption is relatively high. Big;

[0018] (2) V2O5——H2SO4——H2S method, H2S has good reducibility and fast reaction speed, but the gas has low solubility in water (≤0.1M), high toxicity, and should not be controlled during u...

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Abstract

The invention discloses a method for preparing positive electrolyte of an all-vanadium redox flow battery through a chemical synthesis method. Through the method, a high-valence oxide which is insoluble in water is reduced to a low-valence vanadium ion which is easily soluble in water through redox reaction. The adopted chemical synthesis method mainly comprises the following steps of (1) preparing with vanadium ores; (2) preparing by reducing V2O5 through sulfur dioxide; (3) preparing by reducing V2O5 through elemental sulfur; and (4) preparing by reaction of oxides of different valences of vanadium. The activated V2O5 is diluted and reduced to pure blue VOSO4 solution, and the pure blue VOSO4 solution is just dehydrated and dried under the temperature condition of 100 DEG C. The electrolyte prepared by the method has good charge and discharge performance, and is an ideal vanadium battery electrode active material.

Description

technical field [0001] The invention relates to a method for preparing the positive electrode electrolyte of an all-vanadium redox flow battery through a chemical synthesis method. Background technique [0002] All-vanadium redox flow battery (VRB) has attracted much attention due to its advantages of adjustable energy storage capacity and power, high current without damage and deep discharge, long service life, simple operation and maintenance, and environmental protection. It has been greatly developed in recent years. , is gradually moving toward practicality. [0003] Vanadium battery is mainly composed of three parts: electrode material, battery separator, electrolyte, so its development is also mainly restricted by these three aspects. Among them, the electrolyte is the core of the vanadium battery, which is a multi-valence system of vanadium, which realizes the energy storage and release of the vanadium battery. The electrolyte of a vanadium battery is different fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/18Y02E60/50
Inventor 陈殿磊吴艳民任凤
Owner SHENZHEN SINOCREDO NEW ENERGY TECH
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