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Method for preparing electrolyte for vanadium cell

A vanadium battery and electrolyte technology, applied in the field of fuel cells, can solve the problems of many processes, many steps, and difficult to purify, and achieve the effects of inhibiting crystallization, improving stability and electrochemical activity, and accelerating dissolution.

Inactive Publication Date: 2010-02-17
BIG PAWER ELECTRICAL TECH XIANGYANG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of the above-mentioned electrolysis method is that, by direct electrolysis of NH 4 VO 3 or by NH 4 VO 3 Preparation V 2 o 5 Electrolyte method, the preparation process involves the removal of NH 4 + And impurities such as Ca introduced in the process of adjusting the pH value are not easy to purify, and there are many processes and steps

Method used

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  • Method for preparing electrolyte for vanadium cell
  • Method for preparing electrolyte for vanadium cell
  • Method for preparing electrolyte for vanadium cell

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Weigh 73g V 2 o 5 The concentration in 300mL is 4mol·L -1 In the sulfuric acid aqueous solution, under normal temperature, add catechol 3-10g, and keep stirring until V 2 o 5 Dissolve completely, add 5 mL of mercaptophenol, dilute the solution to 400 mL, and obtain a total vanadium content ≥ 1.8 mol L -1 Solution I.

[0039] The above solution is placed in the positive and negative electrolyte liquid storage tanks of the vanadium battery respectively according to the ratio of volume ratio 2: 1, with graphite felt as the electrode, with ion exchange membrane (can be a cation exchange membrane such as: perfluorosulfonic acid membrane , can also use anion exchange membrane) as a battery separator, at a current density of 30 to 80mA·cm -2 Under the current density of charge and discharge activation, the concentration of vanadium ions is ≥1.8mol L respectively. -1 Positive and negative electrolytes for all-vanadium redox flow batteries. The charging current density is...

Embodiment 2

[0041] Weigh 181.0g V 2 o 5 The concentration in 250.0mL is 3.0~4.0mol·L -1 In the sulfuric acid aqueous solution, add ascorbic acid 30g, stir to V 2 o 5 Dissolve completely, add 5 mL each of mercaptophenol and mercaptonicotinic acid, and 8 mL of triethanolamine to obtain solution II with a total vanadium content ≥ 3.0 mol·L-1.

[0042] With the above solution as the negative electrode electrolyte, an equal volume of Na with the same ion concentration 2 SO 4 +H 2 SO 4 The solution is a catholyte, which is respectively placed in electrolytic cells separated by ion-exchange membranes (such as cation-exchange membranes such as perfluorosulfonic acid membranes, or anion-exchange membranes). With the lead plate as the electrode, the current density is 80mA·cm -2 Electrolyze at a current density of 3.0 mol L-1, and control the end point of electrolysis by detecting the potential of the electrolyte. The end point potential is 150-250Mv, and the V 3+ / V 4+ electrolyte.

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Abstract

The invention provides a method for preparing an electrolyte for a vanadium cell, which comprises the following steps: A, dissolving vanadic oxide or vanadous oxide into a sulphuric acid solution; B,adding a reducer selected from one or more compounds of ascorbic acid, ascorbase, ascorbic acid derivative, ascorbate, tea polyphenol, pyrocatechol, hydroxyphenol, hydroquinone and the like. The highconcentration electrolyte for the vanadium cell can be directly prepared from vanadium oxides by the method.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to electrolytes for vanadium batteries. Background technique [0002] The all-vanadium redox flow battery realizes the storage and release of electric energy through the mutual transformation of vanadium ions in different valence states. Cross-contamination caused by permeation, vanadium ions in different valence states are used as positive and negative active materials of the battery, and the positive and negative electrolytes are stored separately, which avoids self-discharge during battery storage and is suitable for large-scale energy storage. [0003] Specifically, in an all-vanadium redox flow battery, the positive and negative chambers are separated by a diaphragm, and the electrodes are composed of electrode active materials and current collectors; the positive electrolyte is composed of V(V) and V(IV) ionic sulfuric acid solutions, and the negative The electrolyte consists of V(I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18H01M10/38
CPCY02E60/12Y02E60/528Y02E60/10Y02E60/50Y02P70/50
Inventor 仲晓玲刘素琴张庆华黄可龙李虹云刘维维吴雪文李茜覃定员
Owner BIG PAWER ELECTRICAL TECH XIANGYANG
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