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Method for adjusting the valence state of vanadium in electrolyte solution of vanadium battery

An electrolyte and vanadium battery technology, applied in the field of vanadium batteries, can solve the problems of replacement of vanadium batteries and increased energy storage costs

Active Publication Date: 2021-07-06
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for adjusting the vanadium valence state in the vanadium battery electrolyte, to solve the problem that the vanadium battery needs to be replaced when the vanadium battery fails, which leads to an increase in energy storage costs

Method used

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  • Method for adjusting the valence state of vanadium in electrolyte solution of vanadium battery
  • Method for adjusting the valence state of vanadium in electrolyte solution of vanadium battery
  • Method for adjusting the valence state of vanadium in electrolyte solution of vanadium battery

Examples

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Embodiment 1

[0041] Embodiment 1 uses vanadium dichloride to adjust the vanadium valence state of the electrolyte of vanadium battery

[0042] Using chemical titration, the concentration of vanadium ions in the vanadium electrolyte that needs to be adjusted to the valence state of vanadium ions is 1.5mol / L, and the average valence is +4.4; the concentration of chloride ions in the vanadium electrolyte is 8.6mol / L; The volume of the electrolytic solution was 20.0 L. The vanadium ion concentration of the target vanadium electrolyte is 1.6mol / L, the average valence state is +3.5, and the chloride ion concentration is 8.8mol / L. The only compound of vanadium is vanadium dichloride. Therefore, according to formula (1), it can be known that the amount of substance n required to obtain vanadium dichloride 5 is 18.0mol, calculate the volume V of the target electrolyte according to the formula (2) 2 is 30.0L, and the amount of required HCl is calculated according to formula (3) to be 28.0mol. Fi...

Embodiment 2

[0045] Example 2 Using vanadium trichloride to adjust the vanadium valence state of the vanadium battery electrolyte

[0046] Using chemical titration, the concentration of vanadium ions in the vanadium electrolyte that needs to be adjusted to the valence state of vanadium ions is 1.5mol / L, and the average valence is +4.4; the concentration of chloride ions in the vanadium electrolyte is 8.6mol / L; The volume of the electrolytic solution was 20.0 L. The vanadium ion concentration of the target vanadium electrolyte is 1.6mol / L, the average valence state is +3.5, and the chloride ion concentration is 8.8mol / L. The only compound of vanadium is vanadium trichloride. Therefore, according to formula (1), it can be known that the amount of substance n required to obtain vanadium trichloride 4 is 54.0mol, calculate the volume V of the target electrolyte according to the formula (2) 2 is 52.5L, and the amount of required HCl substance calculated according to formula (3) is 128.0mol. ...

Embodiment 3

[0047] Example 3 Using vanadium trioxide to adjust the vanadium valence state of the vanadium battery electrolyte

[0048] Using chemical titration, the concentration of vanadium ions in the vanadium electrolyte that needs to be adjusted to the valence state of vanadium ions is 1.5mol / L, and the average valence is +4.4; the concentration of chloride ions in the vanadium electrolyte is 8.6mol / L; The volume of the electrolytic solution was 20.0 L. The vanadium ion concentration of the target vanadium electrolyte is 1.6mol / L, the average valence state is +3.5, and the chloride ion concentration is 8.8mol / L. The only compound of vanadium is vanadium trioxide. Therefore, according to formula (1), it can be known that the amount of substance n required to obtain the required vanadium trioxide 3 is 27.0mol, calculate the volume V of the target electrolyte according to the formula (2) 2 is 52.5L, and the amount of required HCl substance calculated according to formula (3) is 290.0m...

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Abstract

The invention relates to a method for adjusting the valence state of vanadium in a vanadium battery electrolyte, belonging to the field of vanadium batteries. What the present invention aims to solve is the problem that the electrolyte solution needs to be replaced when the vanadium battery fails, which leads to an increase in energy storage cost. Add vanadium-containing compound, HCl and water to obtain the target electrolyte. The vanadium battery electrolyte uses hydrochloric acid as a supporting electrolyte. The vanadium-containing compound is selected from vanadium pentoxide, vanadium oxychloride, vanadium trioxide, tri One or more of vanadium chloride and vanadium dichloride. The method of the invention is simple and easy to operate, can quickly adjust the vanadium valence state of the electrolyte, and obtain electrolyte solutions of various vanadium valence states, can meet the use requirements in different situations, and has very broad application prospects.

Description

technical field [0001] The invention relates to a method for regulating the valence state of vanadium in the electrolyte solution of a vanadium battery, belonging to the field of vanadium batteries. Background technique [0002] Due to its independent output power and capacity, vanadium battery has the advantages of large power and capacity, long cycle life, high energy efficiency, good deep charge and discharge performance, and high safety performance. It is considered to be one of the most promising large-scale storage batteries. Energy-saving batteries are attracting more and more attention. [0003] With the charge and discharge of the vanadium battery, there will be vanadium ion migration between the positive and negative electrolytes, oxidation of divalent vanadium ions in the negative electrolyte, hydrogen evolution at the negative electrode, etc., resulting in the concentration and valence state of vanadium ions in the positive and negative electrolytes being inconsi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/18
CPCH01M8/188Y02E60/50
Inventor 陈勇彭穗韩慧果杨晓
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD