Regeneration method for waste liquor of all-vanadium flow battery

An all-vanadium redox flow battery and electrolytic waste liquid technology, which is applied in the field of regeneration of all-vanadium redox flow battery waste liquid, can solve the problems of high energy consumption, waste, and complicated processes in the electrolysis process, and solve the waste of vanadium raw materials and environmental pollution. Problems, slow capacity decay, and stable performance

Active Publication Date: 2012-05-23
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrolysis process requires the design of an electrolytic cell, the process is complicated, and the electrolysis process adopts a constant current method with a current density of 60mA / cm 2 , electrolysis for 3 hours, the energy consumption of the electrolysis process is relatively high
The positive electrode solution after the electrolysis reaction in this method cannot be processed, causing waste and environmental problems

Method used

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  • Regeneration method for waste liquor of all-vanadium flow battery
  • Regeneration method for waste liquor of all-vanadium flow battery
  • Regeneration method for waste liquor of all-vanadium flow battery

Examples

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Embodiment

[0021] The present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

[0022] First, the method of determining the addition amount of the reducing agent in Examples, ie, titration experiment, is described.

[0023] Titration experiment

[0024] The process of battery operation is to first put VOSO 4 Solution, placed on the positive electrode of the electrolytic cell, and the negative electrode is also the same amount of VOSO 4 Solution, the valence state of V is 4, and the current is passed through. After a period of time, the negative electrode solution becomes a 3-valent electrolyte, that is, V 3+ of sulfuric acid solution. The positive electrode solution is a pentavalent electrolyte. The power-on time is calculated according to the formula: I*t=V*M*96500, where I is the current intensity, t is the time, M is the molar concentration of pentavalent vanadium cations in the electrolyte, V is th...

Embodiment 1

[0039] Solid VOSO 4 Prepared as 1.5mol / L VOSO 4 The solution is filtered with a vacuum pump. The filter hole of the polytetrafluoroethylene filter membrane in the filter is 1 μm, and the VOSO can be removed by filtration. 4 Silicon compound impurities brought in during the production process to obtain 1.5mol / L VOSO 4 solution.

[0040] 1 liter of VOSO with a concentration of 1.5mol / L 4 The solution is placed in the positive electrolyte storage tank of the battery, and the same amount of VOSO 4 The solution is placed in the negative electrode electrolyte storage tank, the electrode material of the battery is polyacrylonitrile-based carbon felt, and the electrode area is 100cm 2 , the diaphragm is Nafion117 ion exchange membrane; the current collector is a carbon plate. The electrolyte tank is placed outside the battery and pumped into the battery. Constant current electrolysis, the current density is 50mA / cm 2 . After 8 hours, the negative electrode solution becomes a t...

Embodiment 2

[0047] Solid VOSO 4 Prepared as 1.5mol / L VOSO 4 The solution is filtered with a vacuum pump. The filter hole of the polytetrafluoroethylene filter membrane in the filter is 1 μm, and the VOSO can be removed by filtration. 4 Silicon compound impurities brought in during the production process to obtain 1.5mol / L VOSO 4 solution.

[0048] 1 liter of VOSO with a concentration of 1.5mol / L 4 Solution, placed in the positive electrode electrolyte liquid storage tank of the electrolytic battery, and the negative electrode is also the same amount of VOSO 4 solution, the electrode material of the battery is polyacrylonitrile-based carbon felt, and the electrode area is 100cm 2 .The diaphragm is Nafion117 ion exchange membrane; the current collector is a carbon plate. The electrolyte tank is placed outside the battery and pumped into the battery. Constant current electrolysis, the current density is 40mA / cm 2 . After 5 hours, the negative electrode solution becomes a 3.5-valent e...

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Abstract

The invention provides a regeneration method for a waste liquor of an all-vanadium flow battery. The method comprises the following step of: reducing, namely enabling positive electrolysis waste liquor obtained after charging the all-vanadium flow battery for the first time to be in contact with a reducing agent to make a pentavalent vanadium positive ion VO<2+> reduced into a tetravalent vanadium positive ion VO<2+> so as to obtain electrolyte. The electrolyte regenerated by the method provided by the invention can be used for charging and discharging the vanadium battery again.

Description

technical field [0001] The invention relates to a method for regenerating waste liquid of an all-vanadium redox flow battery. Background technique [0002] All-vanadium redox flow battery is a new type of green battery and a new type of large-scale electrochemical energy storage device, which has the characteristics of high capacity, wide application field and long cycle life. The main structure of the battery includes electrodes, plates, ion exchange membranes and electrode active materials. The diaphragm divides the battery into two half-cells, positive and negative. The electrode active materials undergo redox reactions on the electrode materials, and the current is derived from the plates. The exchange membrane conducts electricity through protons or anions, uses vanadium-containing solution as the positive and negative electrolytes, and completes electron exchange on the positive and negative electrodes to realize its charge and discharge. [0003] Among them, the vana...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04H01M8/04186H01M8/18
CPCY02E60/50
Inventor 王文红汪国庆张祺王文韬马丽荣王迎姿
Owner ENN SCI & TECH DEV
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