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Recycling method of vanadium flow battery electrolyte

A vanadium redox flow battery and electrolyte technology, which is applied in the field of flow battery applications and energy recovery, can solve the problems of positive and negative electrolyte concentration and valence imbalance, electrolyte can not be reused, affect battery performance, etc., to achieve cost Low cost, less usage, simple operation

Active Publication Date: 2017-03-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the cross-linking of vanadium ions and the continuous occurrence of side reactions, after a long-term operation of the battery, the concentration and valence state of the positive and negative electrolytes are seriously unbalanced, the concentration drops significantly, and a large amount of V remains at the positive electrode. 5+ Or there is a large amount of V remaining at the negative pole 2+ , which seriously affects the performance of the battery, causing the electrolyte to be unusable

Method used

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Effect test

Embodiment 1

[0020] Using the waste electrolyte after long-term charging and discharging as raw material, after mixing the positive and negative electrolytes, it is tested that the trivalent vanadium ion is 0.4mol / L, the tetravalent vanadium ion is 0.8mol / L, and the volume of the electrolyte is 1000L . Concentrate the electrolyte first, the total concentration of vanadium ions is 1.5mol / L, and the volume of the electrolyte is 800L. The electrolyte is divided into positive and negative electrodes of 400L each, and put into the positive and negative electrolyte storage tanks of the vanadium redox flow battery respectively. The electrolyte is electrolyzed, the negative electrode pure trivalent electrolyte is obtained in the negative electrode electrolyte storage tank, the positive electrode tetravalent and pentavalent mixed electrolyte is obtained in the positive electrode electrolyte storage tank, and then 1041mL propane trivalent is added to the positive electrode electrolyte storage tank A...

Embodiment 2

[0022] The waste electrolyte after long-term charging and discharging is used as the raw material. It has been tested that the trivalent vanadium ion is 0.9mol / L, the tetravalent vanadium ion is 0.5mol / L, and the volume of the electrolyte is 2000L. Concentrate the electrolyte first, the total concentration of vanadium ions is 1.8mol / L, and the volume of the electrolyte is 1.56L. Divide the electrolyte into positive and negative electrodes of 780L each, and put them into the positive and negative electrolyte storage tanks of the vanadium redox flow battery respectively. , the electrolyte is electrolyzed, the negative electrode pure divalent and trivalent mixed electrolyte is obtained in the negative electrode electrolyte storage tank, the positive electrode pure tetravalent electrolyte is obtained in the positive electrode electrolyte storage tank, and then 4.48L of oxygen is introduced into the negative electrode , to obtain a negative electrode pure trivalent electrolyte.

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Abstract

The invention relates to a recycling method of a vanadium flow battery electrolyte. According to the method, the electrolyte of the flow battery of which the capacity fades after charge and discharge use is taken as a raw material, a reducing agent or an oxidizing agent is added to the raw material after pretreatment, the concentration of vanadium ions in the electrolyte is adjusted and the electrolyte can be repeatedly recycled. A waste electrolyte is pretreated, a proper reducing agent or oxidizing agent is added to the waste electrolyte and the concentration of the vanadium ions in the electrolyte is adjusted, so that the problem of recycling of the waste electrolyte is finally solved and efficient utilization of the electrolyte is achieved. The recycling method is simple in process, simple and convenient to operate, simple and available in raw material, low in cost and significant in effect.

Description

technical field [0001] The invention relates to the fields of application and energy recovery of a liquid flow battery, in particular to a method for recycling and reusing an electrolyte of a liquid flow battery and its application. Background technique [0002] With the development of the economy, traditional energy can no longer meet the needs of human development, and renewable energy has attracted more and more attention from all countries. Due to the instability of renewable energy such as solar energy and wind energy, in order to develop and utilize it on a large scale, it is necessary to research and develop large-scale energy storage so that renewable energy can be used by human beings. In various energy storage systems, redox flow batteries are widely used in energy storage due to their fast charge and discharge response, simple battery structure, large and adjustable capacity, no solid-phase reaction, low price, long life, and environmental friendliness. In partic...

Claims

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Application Information

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IPC IPC(8): H01M8/00
CPCH01M8/008Y02W30/84
Inventor 孙佳伟张华民李先锋刘涛史丁秦
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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