Preparation method for commercial vanadium battery electrolyte

An electrolyte and vanadium battery technology, applied in the field of vanadium battery electrolyte preparation, can solve the problems of increasing the preparation cost, cumbersome reaction process, increasing the reaction process, etc., achieving good economic and social benefits, shortening the process process, and reducing impurities The effect of content

Active Publication Date: 2014-02-26
HEBEI IRON AND STEEL
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  • Abstract
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Problems solved by technology

[0008] (1) Adding additives during the reaction process: Additives will affect the conductivity and electrochemical properties of the solution, which will cause the dehydration of vanadium oxyhydration ions in the solution, which is not conducive to the dissolution of vanadium
[0009] (2) The reaction process is cumbersome: during the reaction process, electrolysis is required to obtain the vanadium battery electrolyte in which trivalent vanadium and tetravalent vanadium each account for 50% of the total vanadium, which increases the reaction process and increases the preparation cost
[0010] (3) High impurity content: The vanadium electrolyte prepared according to the experimental raw materials used in the above patent contains high content of impurities such as iron, chromium, silicon, etc., and these impurities have an important impact on the service life of the battery

Method used

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  • Preparation method for commercial vanadium battery electrolyte

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Effect test

Embodiment 1

[0031] Example 1: figure 1 As shown, the specific process of the preparation method of the vanadium battery electrolyte is as follows.

[0032] Ammonium polyvanadate is used as raw material, sodium hydroxide is added to dissolve it, the filtrate is adjusted to pH 9, and aluminum sulfate is added to remove impurities. After removing impurities, adjust the pH value of the filtrate to 1.5, and heat to precipitate ammonium polyvanadate. Then redissolve the ammonium polyvanadate with ammonia water, adjust the pH value to 2.0 to sink the ammonium polyvanadate, filter and dry, then burn vanadium trioxide at 800°C under the condition of feeding ammonia gas, and then make the divanadium trioxide Vanadium and concentrated sulfuric acid are mixed and stirred, and high-purity water is added to dissolve and then filtered to obtain a vanadium electrolyte. The impurity content of the obtained vanadium electrolyte is Al<17ppm, Na<15ppm, Fe<15ppm, Ca<15ppm, K<10ppm, Cr<5ppm, and the contents...

Embodiment 2

[0033] Embodiment 2: The specific process of the preparation method of the vanadium battery electrolyte is as follows.

[0034] Using ammonium polyvanadate as raw material, add ammonia water to dissolve it under heating, adjust the pH value of the filtrate to 7.5, and add sodium metaaluminate to remove impurities. After removing impurities, adjust the pH value of the filtrate to 1.9, and heat to precipitate ammonium polyvanadate. Then ammonium polyvanadate was redissolved with ammonia water, and the pH value was adjusted to 2.3 to deposit ammonium polyvanadate. After filtration and drying, vanadium trioxide was fired at 800°C under the condition of feeding ammonia gas, and then the divanadium trioxide was Vanadium and concentrated sulfuric acid are mixed and stirred, and high-purity water is added to dissolve and then filtered to obtain a vanadium electrolyte. The impurity content of the obtained vanadium electrolyte is Al<17ppm, Na<15ppm, Fe<15ppm, Ca<15ppm, K<10ppm, Cr<5ppm...

Embodiment 3

[0035] Embodiment 3: The specific process of the preparation method of the vanadium battery electrolyte is as follows.

[0036] Vanadium pentoxide is used as raw material, potassium hydroxide is added to dissolve it, the filtrate is adjusted to a pH value of 8-9, and aluminum chloride is added to remove impurities. After removing impurities, adjust the pH value of the filtrate to 10, and heat to precipitate ammonium polyvanadate. Then ammonium polyvanadate was redissolved with potassium hydroxide, and the pH value was adjusted to 2.3 to deposit ammonium polyvanadate. After filtration and drying, vanadium trioxide was fired at 800°C under the condition of feeding ammonia gas, and then the three Mix vanadium oxide with concentrated sulfuric acid, add high-purity water to dissolve, and filter to obtain vanadium electrolyte. The impurity content of the obtained vanadium electrolyte is Al<17ppm, Na<16ppm, Fe<15ppm, Ca<25ppm, K<10ppm, Cr<5ppm, and the contents of other impurity ele...

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Abstract

The invention discloses a preparation method for commercial vanadium battery electrolyte. According to the preparation method, vanadium electrolyte is prepared by one step through a chemical method; the preparation method comprises the following steps: dissolving raw materials containing vanadium by using an alkali; adjusting a pH (Potential of Hydrogen) value by acid-alkali regulation; repeatedly precipitating the vanadium to remove impurity elements; then roasting to obtain an oxide of the vanadium; finally, dissolving the oxide of the vanadium by using concentrated sulfuric acid to obtain the vanadium electrolyte. With the adoption of the method, impurities including iron, chrome, silicon, manganese and the like can be removed effectively and a process flow is shortened; the vanadium yield is improved, the impurity content is reduced and the process flow is shortened; the product purity can also be improved. The preparation method for the commercial vanadium battery electrolyte has important meanings on production technology levels and market competitiveness of the vanadium electrolyte; the method has good economic benefits and social benefits.

Description

technical field [0001] The invention relates to the field of battery manufacturing, in particular to a method for preparing an electrolyte solution for a vanadium battery. Background technique [0002] Among the existing liquid flow energy storage technologies, the all-vanadium redox flow battery (referred to as vanadium battery) has the advantages of adjustable energy storage capacity and power, high-current non-destructive deep discharge, long service life, simple operation and maintenance, and environmental protection. merits have attracted much attention. With the continuous development of related technologies, vanadium batteries are gradually becoming practical. Vanadium battery is mainly composed of three parts: electrode material, battery diaphragm, electrolyte, so its development is also mainly restricted by these three aspects. Among them, the electrolyte is the core of the vanadium battery. The quality of the electrolyte directly determines the energy storage cap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/20
CPCY02E60/528H01M8/20H01M2300/0011Y02E60/50
Inventor 陈东辉栗金刚徐从美杜刚闫浩
Owner HEBEI IRON AND STEEL
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