Electrochemical preparation method of 3.5 valence vanadium electrolyte

An electrochemical and electrolyte technology, applied in the field of electrochemical preparation of 3.5-valent vanadium electrolyte, can solve the problems of complex preparation process, high price, unsuitable for large-scale production of electrolyte, etc., to reduce cross-contamination and oxidation resistance. requirements, the effect of reducing energy consumption

Inactive Publication Date: 2015-05-20
NO 63971 TROOPS PLA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The raw materials of this kind of method are all vanadium oxides, the raw material preparation process is complicated, the price is expensive, and it should not be suitable for the large-scale production of electrolyte

Method used

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  • Electrochemical preparation method of 3.5 valence vanadium electrolyte

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] Will 11 liters 1.6MVOSO 4 +3MH 2 SO 4 The solution is injected into the positive electrode tank, and 20 liters of 1.6MVOSO 4 +3MH 2 SO 4 The solution is injected into the negative electrode tank, and the electrode area of ​​the electrolytic cell is 0.9m 2 , use nafionl15 membrane to separate the electrolytic cell, use constant current electrolysis method, carry out constant current electrolysis at a current density of 180 amps, control the cell voltage at 1.8V, otherwise reduce the electrolysis current, after the electrolysis power reaches 428.8Ah, stop electrolysis, set 3.5 The negative vanadium solution of the price is discharged, and 20 liters of 1.6MVOSO are re-injected 4 +3MH 2 SO 4 solution, at the same time, add water and hydrazine 4.8M to the positive electrode solution, after the reaction is complete, repeat the last electrolysis.

example 2

[0022] Will 11 L 2.0MVOSO 4 +3MH 2 SO 4 solution into the positive tank, 20 liters of 2.0MVOSO 4 +3MH 2 SO 4 The solution is injected into the negative electrode tank, and the electrode area of ​​the electrolytic cell is 0.9m 2 , use nafionl15 membrane to separate the electrolytic cell, use the constant current electrolysis method, carry out constant current electrolysis at a current density of 180 amps, control the cell voltage at 1.8V, otherwise reduce the electrolysis current, after the electrolysis power reaches 536Ah, stop the electrolysis and change the valence of 3.5 The negative vanadium solution is discharged, and 20 liters of 2.0MVOSO are re-injected 4 +3MH 2 SO 4 solution, at the same time, add water and hydrazine 6.0M to the positive electrode solution, after the reaction is complete, repeat the last electrolysis.

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Abstract

The invention belongs to the fields of chemical engineering and industry, and especially relates to a preparation method of an all vanadium redox flow battery electrolyte. The method adopts an electrolysis device, adopts a chemically and electrochemically combined technology to reduce high valence vanadium, and a vanadium (IV) raw material is reduced through parts of electric energy and a reducing agent for reducing vanadium (V) to prepare a highly pure 3.5 valence vanadium solution. The 3.5 valence vanadium can be directly used as the all vanadium redox flow battery positive and negative electrolyte, and the electrolyte can realize positive electrode and negative electrode coupling after initial charge, can be used without an activation process, and is an all vanadium redox flow electrolyte product with a best valence. The method has the characteristics of short preparation flow, low electric energy consumption and high product purity, and easily realizes continuous production.

Description

technical field [0001] The invention relates to a method for preparing an electrolyte for an all-vanadium redox flow battery, in particular to an electrochemical preparation method for a 3.5-valence vanadium electrolyte. The method adopts an electrolysis device, adopts a combined method of electrochemical and chemical reduction, consumes part of electric energy and a reducing agent capable of reducing 5-valent vanadium, and prepares a high-purity 3.5-valent vanadium solution with 4-valent vanadium as a raw material. The 3.5-valent vanadium can be directly applied to the positive and negative electrodes of the all-vanadium redox flow battery, and the positive and negative electrodes can be matched after the first charge, and can be used without going through the activation process. It is the all-vanadium redox flow electrolyte product with the best valence. The method has the characteristics of short preparation process, low power consumption and high product purity. technica...

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 文越华徐艳程杰陈东辉栗金刚徐丛美杜刚阎浩
Owner NO 63971 TROOPS PLA
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