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A kind of preparation method and application of high energy density vanadium electrolyte

A high-energy density, electrolyte technology, applied in electrolytes, acidic electrolytes, aqueous electrolytes, etc., can solve the problems of not improving the reversibility of vanadium ion charge and discharge, not being able to stabilize dispersion, and not being able to exist stably, and to improve cycle stability. properties and energy density, improving charge-discharge reversibility, and reducing kinematic viscosity

Active Publication Date: 2020-09-11
HUNAN INSTITUTE OF ENGINEERING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most organic components have poor compatibility with the vanadium electrolyte, and cannot exist stably in the catholyte charging (environment of strong acid and strong oxidation), neither can play the role of dispersion stability, nor improve the charge and discharge reversibility of vanadium ions

Method used

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  • A kind of preparation method and application of high energy density vanadium electrolyte
  • A kind of preparation method and application of high energy density vanadium electrolyte

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Experimental program
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Effect test

Embodiment 1

[0029] (1) Add 250g deionized water, 250g maleic anhydride, catalyst V 2 O 5Powder 10g, start the stirrer, slowly heat up to 90°C, then slowly add 50g of 30% H 2 o 2 Solution, insulation reflux reaction 2 hours, be cooled to room temperature, obtain the polymaleic acid dispersant solution of low molecular weight;

[0030] (2) add polymaleic anhydride dispersant solution 80g in step (1) in reactor, V 2 o 5 Powder 540g, sulfur powder 56g, concentrated sulfuric acid 640g, start the agitator, open the tail gas absorber, and use a 15% NaOH solution to absorb SO 2 , slowly warming up to 120 ° C, reflux and heat preservation reaction for 5 hours;

[0031] (3) Observe the color change of the reactant. When it is nearly dark green, sample and dilute to measure the valence state of vanadium by spectrophotometry. When the valence state is 3.5, cool to 50°C, add a small amount of deionized water, and remove the residual under reduced pressure. SO 2 , cooled to room temperature;

...

Embodiment 2

[0034] (1) Add 250g deionized water, 300g maleic anhydride, catalyst V 2 o 5 Powder 13g, start the stirrer, slowly heat up to 110°C, then slowly add 90g of 30% H 2 o 2 Solution, insulation reflux reaction 1.5 hours, be cooled to room temperature, obtain the polymaleic acid dispersant solution of low molecular weight;

[0035] (2) add polymaleic acid dispersant solution 160g in step (1) in reactor, V 2 o 5 Powder 560g, sulfur powder 66g, concentrated sulfuric acid 700g, start the agitator, open the tail gas absorber, and use a 15% NaOH solution to absorb SO 2 , slowly warming up to 140 ° C, reflux and heat preservation reaction for 8 hours;

[0036] (3) Observe the color change of the reactant. When it is nearly dark green, sample and dilute to measure the valence state of vanadium by spectrophotometry. When the valence state is 3.5, cool to 70°C, add a small amount of deionized water, and remove the residual under reduced pressure. SO 2 , cooled to room temperature;

...

Embodiment 3

[0039] (1) Add 300g deionized water, 280g maleic anhydride, catalyst V 2 o 5 Powder 16g, start the stirrer, slowly heat up to 100°C, then slowly add 70g of 30% H 2 o 2 Solution, insulation reflux reaction 2 hours, be cooled to room temperature, obtain the polymaleic acid dispersant solution of low molecular weight;

[0040] (2) add polymaleic acid dispersant solution 120g in step (1) in reactor, V 2 o 5 Powder 550g, sulfur powder 60g, concentrated sulfuric acid 680g, start the agitator, open the tail gas absorber, and use a NaOH solution with a mass fraction of 15% to absorb SO 2 , slowly warming up to 130 ° C, reflux and heat preservation reaction for 6 hours;

[0041] (3) Observe the color change of the reactant. When it is nearly dark green, sample and dilute to measure the valence state of vanadium by spectrophotometry. When the valence state is 3.5, cool to 60°C, add a small amount of deionized water, and remove the residual under reduced pressure. SO 2 , cooled to...

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Abstract

The invention relates to a preparation method and application of a high-energy-density vanadium electrolyte solution. The preparation method comprises the steps: firstly, obtaining low-molecular-weight (400-800) polymaleic acid, and then carrying out a reaction of polymaleic acid with vanadium pentoxide, a sulfur powder and sulfuric acid, controlling an end point of the reaction, carrying out degassing and impurity removal, and adjusting the concentration, to obtain a high-concentration vanadium electrolyte solution (3.5 valence). The large-scale production can be realized, the production costis low, the process is clean and environmentally friendly, moreover, the vanadium electrolyte solution can be directly used for commercial vanadium batteries, the battery charge and discharge reversibility is high and the cycle stability is good.

Description

technical field [0001] The invention relates to a preparation method and application of a high-energy-density vanadium electrolyte, and belongs to the technical field of large-scale energy storage liquid flow batteries. Background technique [0002] With the development of society and the improvement of people's living standards, the current situation of resource shortage and environmental pollution is becoming more and more serious. The development of clean energy and the development of energy storage technology are of great significance to the harmonious development of social economy and natural environment. [0003] The all-vanadium redox flow battery (abbreviated as vanadium battery, abbreviated as VRB) was proposed in 1984 by Skyllas-kazacos et al., University of South Wales, Australia. Due to the advantages of high energy efficiency, fast response, high cost performance, long life, independent design of power and capacity, green safety and environmental protection, va...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/18
CPCH01M8/188H01M2300/0011H01M2300/0091Y02E60/50
Inventor 汪南方綦远会
Owner HUNAN INSTITUTE OF ENGINEERING
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