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Method of regulating the valence of vanadium in electrolyte of vanadium cell

An electrolyte and vanadium battery technology, applied in the field of vanadium batteries, can solve the problems of increased energy storage costs and replacement of vanadium batteries, and achieve the effects of avoiding waste, simple and easy operation, and broad application prospects

Active Publication Date: 2019-02-01
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 of regulating the valence of vanadium in electrolyte of vanadium cell
  • Method of regulating the valence of vanadium in electrolyte of vanadium cell
  • Method of regulating the valence of vanadium in electrolyte of vanadium cell

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 of regulating the valence of vanadium in the electrolyte of a vanadium cell and belongs to the field of vanadium cells. The invention is to solve the problem of increase of energy storage cost due to the necessity of replacement of the electrolyte if the vanadium cell is failure. The method includes: adding a vanadium-containing compound, HCl and water to the electrolyte of the vanadium cell, thus obtaining target electrolyte, wherein the HCl is a supporting electrolyte, the vanadium-containing compound is selected from one or more than two of vanadium pentoxide, vanadyl dichloride, vanadium trioxide, vanadium trichloride and vanadium dichloride. The method is simple and can quickly regulate the valence of vanadium in the electrolyte, thereby preparing electrolytes with different vanadium valences, so that use demands under different situations are satisfied. The method has very extensive application prospect.

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 Applications(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
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