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Preparation method of all-vanadium redox flow battery electrolyte

A liquid flow battery and electrolyte technology, applied in the direction of regenerative fuel cells, etc., can solve the problems of complex electrolyte production process, residual impurities, slow reaction rate, etc., and achieve low-cost clean production, low cost, and simple process.

Inactive Publication Date: 2019-05-10
WUHAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reducing agent is mostly SO 2 , oxalic acid, propionic acid, succinic acid, glycerol, benzyl alcohol, malonic acid, glutaric acid, methanol, copper and sodium thiosulfate and other substances, because the reducing agent used cannot meet the requirements of high efficiency and pollution-free , no impurity residue and low cost requirements, the production process of the electrolyte is complicated, the reaction rate is slow, the cost is high, there is pollution and there is impurity residue

Method used

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  • Preparation method of all-vanadium redox flow battery electrolyte
  • Preparation method of all-vanadium redox flow battery electrolyte

Examples

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Embodiment 1

[0027] A method for preparing an electrolyte solution for an all-vanadium redox flow battery. The preparation method described in this embodiment is:

[0028] Step 1. Mix vanadium pentoxide and deionized water according to a solid-to-liquid ratio of (100-150): 1g / L, mix the vanadium pentoxide and the deionized water, and stir to obtain a mixed slurry.

[0029] Step 2, according to the molar ratio of sulfuric acid: vanadium pentoxide (2-3): 1, adding the sulfuric acid into the mixed slurry and stirring to obtain an activated slurry.

[0030] Step 3, according to carbonaceous reductant: molar ratio of vanadium pentoxide is (0.5~1.5): 1, described carbonaceous reductant is added in described activation slurry, then adds all described carbonaceous reductant The activated slurry is placed in a reaction kettle, stirred at 100-160° C. for 1-2 hours, and filtered to obtain a crude electrolyte solution.

[0031] Step 4, placing the thick electrolyte solution on the negative electrode...

Embodiment 2

[0035] A method for preparing an electrolyte solution for an all-vanadium redox flow battery. The preparation method described in this embodiment is:

[0036] Step 1. Mix vanadium pentoxide and deionized water according to a solid-to-liquid ratio of (150-200): 1g / L, mix the vanadium pentoxide and the deionized water, and stir to obtain a mixed slurry.

[0037] Step 2. According to the molar ratio of sulfuric acid: vanadium pentoxide (3-4): 1, add the sulfuric acid into the mixed slurry and stir to obtain an activated slurry.

[0038] Step 3, according to carbonaceous reductant: molar ratio of vanadium pentoxide is (1.0~2.0): 1, described carbonaceous reductant is added in described activation slurry, then adds all described carbonaceous reductant The activated slurry is placed in a reaction kettle, stirred at 120-180° C. for 2-3 hours, and filtered to obtain a crude electrolyte solution.

[0039] Step 4, placing the thick electrolyte solution on the negative electrode of the...

Embodiment 3

[0043] A method for preparing an electrolyte solution for an all-vanadium redox flow battery. The preparation method described in this embodiment is:

[0044] Step 1. Mix vanadium pentoxide and deionized water according to a solid-to-liquid ratio of (200-250): 1 g / L, mix the vanadium pentoxide and the deionized water, and stir to obtain a mixed slurry.

[0045] Step 2: According to the molar ratio of sulfuric acid: vanadium pentoxide (4-5): 1, add the sulfuric acid into the mixed slurry and stir to obtain an activated slurry.

[0046] Step 3, according to carbonaceous reductant: the molar ratio of vanadium pentoxide is (1.5~2.5): 1, described carbonaceous reductant is added in the described activation slurry, then adds all described carbonaceous reductant The activated slurry is placed in a reaction kettle, stirred at 140-200° C. for 1-2 hours, and filtered to obtain a crude electrolyte solution.

[0047] Step 4, placing the thick electrolyte solution on the negative electrode...

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Abstract

The invention relates to a preparation method of an all-vanadium redox flow battery electrolyte. A technical scheme of the preparation method comprises the steps of mixing vanadium pentoxide and deionized water in a solid-to-liquid ratio of (100-400):1g / L, stirring the mixture to obtain a mixed slurry; adding sulfuric acid to the mixed slurry at a molar ratio of sulfuric acid to vanadium pentoxidebeing (2-8):1, and stirring the mixture to obtain an activated slurry; adding a carbonaceous reducing agent to the activated slurry in a molar ratio of carbonaceous reducing agent to vanadium pentoxide being (0.5-3.0):1, stirring the mixture in the reactor at 100-260 degrees centigrade for 1-4 hours, filtering the mixture to obtain an electrolyte raw liquor; placing the electrolyte raw liquor ina negative electrode of an electrolytic cell, adding a sulfuric acid solution having the same acidity as the electrolyte raw liquor into a positive electrode of the electrolytic cell, electrolyzing the electrolyte raw liquor at the constant current of 1-5 A to the valence state of 3.5 to prepare the all-vanadium redox flow battery electrolyte. The preparation method of the all-vanadium redox flowbattery electrolyte is simple in process, high in efficiency, low in cost and free of pollution; the prepared electrolyte is free of residual impurity.

Description

technical field [0001] The invention belongs to the technical field of electrolyte preparation, and in particular relates to a method for preparing the electrolyte of an all-vanadium redox flow battery. Background technique [0002] Due to the intermittent and unstable power generation of renewable energy such as wind energy and solar energy, it is impossible to provide stable power supply. Therefore, when developing and utilizing these renewable energy sources, it is necessary to develop a large-scale electric energy storage system to realize peak-shaving and valley-filling of the power grid. Power supply and demand contradiction. Vanadium battery energy storage technology is considered to be the most promising flow battery energy storage technology due to its advantages of large energy storage scale, high safety, long cycle life, and environmental friendliness. As the energy storage medium of the vanadium battery, the electrolyte not only determines the energy storage cap...

Claims

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Application Information

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IPC IPC(8): H01M8/18
CPCY02E60/50
Inventor 张一敏杨亚东刘涛李爱魁黄晶丁木清
Owner WUHAN UNIV OF SCI & TECH
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