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Method for regenerating failure electrolyte of all-vanadium redox flow battery

A technology of all-vanadium redox flow battery and electrolyte, which is applied in the field of regeneration of spent electrolyte of all-vanadium redox flow battery, and can solve the problems of vanadium recovery and utilization rate not reaching 100%, unsuitable impurity ion content, waste water and waste gas polluting the environment, etc. , to achieve the effect of improving electrochemical performance, eliminating adverse effects, and simplifying the process flow

Active Publication Date: 2020-07-24
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can eliminate the influence of trace impurity ions, the effect is not ideal when the concentration of impurity ions in the electrolyte is high. Therefore, when the concentration of impurity ions in the electrolyte is high, it is necessary to consider preliminary impurity removal.
[0005] To sum up, the current method for regenerating the exhausted electrolyte of all-vanadium redox flow batteries generally adopts the method of diluting and adjusting the pH to precipitate vanadium to recover vanadium, which has complex process, high processing cost, and the recovery rate of vanadium cannot reach 100%. Produce waste water and waste gas to pollute the environment; and the method of adding complexing agent to the electrolyte is not suitable for the situation where the content of impurity ions in the electrolyte is high

Method used

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Embodiment 1

[0034] A method for regenerating the spent electrolyte of an all-vanadium redox flow battery. The concrete steps of the method described in this embodiment are:

[0035] Step 1, according to the mass ratio of carbon material: anion exchange resin: binder: organic solvent is 1: (0.4~0.8): (0.2~0.4): (5~8), the carbon material, the anion Mix the exchange resin, the binder and the organic solvent, and stir for 3-5 hours to obtain the mixed solution I; then spray or smear the mixed solution I evenly on the graphite felt electrode, and then heat the mixture at 50-65°C Conditioned drying, the anode composite electrode was prepared.

[0036] Step 2, according to carbon material: cation exchange resin: binder: the mass ratio of organic solvent is 1: (2~4): (0.2~0.4): (5~8), described carbon material, described cation Mix the exchange resin, the binder, and the organic solvent, and stir for 3 to 5 hours to obtain the mixed solution II; then spray or smear the mixed solution II evenly...

Embodiment 2

[0043] A method for regenerating the spent electrolyte of an all-vanadium redox flow battery. The concrete steps of the method described in this embodiment are:

[0044] Step 1, according to the mass ratio of carbon material: anion exchange resin: binder: organic solvent is 1: (0.1~0.5): (0.05~0.3): (2~6), the carbon material, the anion Mix the exchange resin, the binder and the organic solvent, and stir for 2-4 hours to obtain the mixed solution I; then spray or smear the mixed solution I evenly on the graphite felt electrode, and then heat it at 40-60°C Conditioned drying, the anode composite electrode was prepared.

[0045] Step 2, according to the mass ratio of carbon material: cation exchange resin: binder: organic solvent is 1: (1~3): (0.05~0.3): (2~6), the carbon material, the cation Mix the exchange resin, the binder and the organic solvent, and stir for 2-4 hours to obtain the mixed solution II; then spray or smear the mixed solution II evenly on the graphite felt e...

Embodiment 3

[0052] A method for regenerating the spent electrolyte of an all-vanadium redox flow battery. The concrete steps of the method described in this embodiment are:

[0053] Step 1. According to the mass ratio of carbon material: anion exchange resin: binder: organic solvent is 1: (0.7~1): (0.35~0.5): (7~10), the carbon material, the anion Mix the exchange resin, the binder and the organic solvent, and stir for 4-6 hours to obtain the mixed solution I; then spray or smear the mixed solution I evenly on the graphite felt electrode, and then heat the mixture at 55-75°C Conditioned drying, the anode composite electrode was prepared.

[0054] Step 2, according to the mass ratio of carbon material: cation exchange resin: binder: organic solvent is 1: (3~5): (0.35~0.5): (7~10), the carbon material, the cation Mix the exchange resin, the binder and the organic solvent, and stir for 3-6 hours to obtain the mixed solution II; then spray or smear the mixed solution II evenly on the graphi...

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Abstract

The invention relates to a method for regenerating a failure electrolyte of an all-vanadium redox flow battery. The technical scheme is as follows: the preparation method comprises the steps of proportioning a carbon material, anion exchange resin, a binder and an organic solvent in a mass ratio of 1: (0.1 to 1): (0.05 to 0.5): (2 to 10), and uniformly mixing to obtain a mixed solution I; preparing a carbon material, cation exchange resin, a binder and an organic solvent according to a mass ratio of 1: (1 to 5): (0.05 to 0.5): (2 to 10), and uniformly mixing to obtain a mixed solution II; respectively spraying or smearing the mixed solution I and the mixed solution II on a graphite felt electrode and drying; placing the dried anode composite electrode and cathode composite electrode at a positive electrode end and a negative electrode end corresponding to a capacitive deionization device, and circularly pumping the failure electrolyte of the all-vanadium redox flow battery into the capacitive deionization device under the condition of direct-current voltage to obtain an electrolyte I; and adding a chelating agent into the electrolyte I, and mixing to obtain the regenerated electrolyte. The regenerated electrolyte prepared by the method is low in impurity content and good in stability and electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of vanadium battery electrolyte. In particular, the invention relates to a method for regenerating an exhausted electrolyte of an all-vanadium redox flow battery. Background technique [0002] Vanadium battery is a new type of green and pollution-free chemical energy storage battery. Compared with other energy storage batteries, vanadium batteries have the characteristics of long operating life, low operation and maintenance costs, high reliability, strong safety and easy large-scale application. As an important part of the vanadium battery, the vanadium battery electrolyte is the energy storage active material of the vanadium battery. The performance of the vanadium battery electrolyte directly determines the performance of the vanadium battery. However, after long-term operation of the vanadium battery, the impurity ions in the electrolyte continue to accumulate, which leads to the failure of the electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18H01M8/04276
CPCH01M8/04276H01M8/188Y02E60/50
Inventor 刘涛丁木清张一敏薛楠楠刘红
Owner WUHAN UNIV OF SCI & TECH
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