All-vanadium redox flow battery electrolyte stabilizer and preparation method thereof

An all-vanadium redox flow battery and stabilizer technology, which is applied in fuel cells, organic electrolytes, non-aqueous electrolytes, etc., can solve problems such as changing the acidity of the system, enhancing the corrosion ability of the electrolyte, and affecting the service life of the stack, so as to improve stability Sex, acidity have no effect, prevent or inhibit the effect of self-polymerization

Active Publication Date: 2019-05-03
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of these additives will introduce some impurity elements, and some impurity elements will change the acidity of the system, which may increase the corrosion ability of the electrolyte and affect the overall service life of the stack

Method used

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Examples

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Effect test

preparation example Construction

[0015] In an exemplary embodiment of the present invention, the preparation method of the stabilizer for the electrolyte of the all-vanadium redox flow battery comprises the following steps:

[0016] 1) Add glycerol, maleic anhydride and acrylamide with a mass ratio of 1:6:1 to 1:6:6 into distilled water respectively, and mix evenly to obtain a first mixed solution. Wherein, the volume of distilled water accounts for 70% of the prepared stabilizer.

[0017] In the above, in order to achieve the purpose of mixing the mixed liquid uniformly, for example, the mixed liquid may be mixed by means of stirring, however, the present invention is not limited thereto. Other methods that can make the mixed solution evenly mixed are also available. Preferably, the first mixed liquid can be obtained after being stirred for 10 minutes to 20 minutes at a rotation speed of 150 to 300 rpm, and then left to stand for 5 minutes.

[0018] 2) Take out 15% to 30% of the volume of the first mixed s...

Embodiment 1

[0025] Prepare 100 mL of stabilizer. Add 95ml of distilled water into the beaker, then add 3g of glycerol, 18g of maleic anhydride and 9g of acrylamide respectively. At normal temperature, the mixture was stirred at a speed of 150 rpm for 20 minutes, and then stood still for 5 minutes. Divide the static mixture into two parts, one part is 15mL A solution, the other part is 85mL B solution. At a rotational speed of 150 rpm, heat solution B to 70° C., add 20 ml of 30% hydrogen peroxide at a rate of 1 drop per second. Then add solution A dropwise at a rate of 2 drops per second to the above solution with hydrogen peroxide added. After the dropwise addition, keep it warm at 70°C for 1.5 hours, adjust the speed to 120 rpm, cool to room temperature, and obtain stable agent.

[0026] In the positive electrode electrolyte solution that contains vanadium concentration and is 1.9mol / L, add the glycerol fat copolymer additive that volume is the maleic anhydride-acrylamide of electroly...

Embodiment 2

[0028] Prepare 100 mL of stabilizer. Add 95ml of distilled water into the beaker, then add 5g of glycerol, 30g of maleic anhydride and 5g of acrylamide respectively. At normal temperature, the mixture was stirred at a speed of 200 rpm for 15 minutes, and then stood still for 8 minutes. Divide the static mixture into two parts, one part is 20mL A solution, and the other part is 80mL B solution. At a speed of 220 rpm, the B solution was heated to 80° C., and 1 mol of 50% hydrogen peroxide was added at a rate of 2 drops per second. Then add solution A dropwise at a rate of 2 drops per second to the above solution with hydrogen peroxide added. After the dropwise addition, keep it warm at 80°C for 2 hours, adjust the speed to 180 rpm, and cool to room temperature to obtain a stable solution. agent.

[0029] Add a maleic anhydride-acrylamide glycerol ester copolymer additive with a volume ratio of 3% of the electrolyte to the anode electrolyte with a vanadium-containing concentra...

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Abstract

The invention provides an electrolyte stabilizing agent for an all-vanadium redox flow battery and a preparation method for the electrolyte stabilizing agent. The stabilizing agent comprises a carboxyl functional group and an amino functional group. The preparation method comprises the following steps of mixing maleic anhydride, acrylamide, glycerine and distilling water to obtain a mixed solution; taking out a part of the mixed solution for use; and stirring and heating the residual mixed solution, dropwise adding hydrogen peroxide and the mixed solution for use, and cooling to obtain the electrolyte stabilizing agent for the all-vanadium redox flow battery. The stabilizing agent can supply the carboxyl functional group which can generate chelating with pentavalent vanadium ions and the amino functional group which has an adsorption effect on the pentavalent vanadium ions, so that self polymerization of the pentavalent vanadium ions can be effectively prevented or restrained, generation of sediments can be prevented, and the stability of the electrolyte can be effectively improved.

Description

technical field [0001] The invention belongs to the field of all-vanadium redox flow batteries, and specifically relates to an electrolyte stabilizer for all-vanadium redox flow batteries and a preparation method thereof. Background technique [0002] All-vanadium redox flow battery (referred to as all-vanadium battery or vanadium battery) has become a wind energy, solar energy and other renewable energy and One of the most promising methods for large-scale energy storage such as power peak shaving and valley filling. All-vanadium redox flow batteries are usually composed of electrolyte, electrodes, liquid storage tanks, etc. There are many factors that affect its performance, but the performance of the electrolyte has the most obvious impact. As all-vanadium redox flow batteries are becoming more and more large-scale and large-capacity, the electrolyte is also developing towards high concentrations. However, when the concentration of pentavalent vanadium ions in the posit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/18
CPCH01M8/188H01M2300/0025Y02E60/50
Inventor 李道玉彭穗刘波曹敏龙秀丽陈勇韩慧果陈婷
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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