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A kind of regeneration method of electrode activity of all-vanadium redox flow battery

An all-vanadium redox flow battery and electrode activity technology, which can be used in regenerative fuel cells and other directions, can solve problems such as reduced energy efficiency, reduced voltage efficiency, and increased electrochemical polarization of the battery, so as to extend the service life, reduce maintenance costs, The effect of high practical value

Active Publication Date: 2020-04-17
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

[0003] However, after long-term operation of the all-vanadium redox flow battery, its voltage efficiency will decrease, resulting in a decrease in energy efficiency and affecting the actual discharge power of the battery.
The main reason for this phenomenon is that during the long-term charging and discharging process, the pentavalent vanadium in the positive electrode and the divalent vanadium in the negative electrode will precipitate on the surface of the electrode material, covering the reactive sites, and then the electrocatalytic activity of the electrode will decrease. The electrochemical polarization of the battery increases

Method used

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  • A kind of regeneration method of electrode activity of all-vanadium redox flow battery

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Experimental program
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Effect test

Embodiment 1

[0019] A full vanadium redox flow battery using carbon felt as an electrode was subjected to a charge-discharge cycle test, and the positive electrolyte was 1.5MVO 2+ 3M H 2 SO 4 Solution 100ml, negative electrode electrolyte is 1.5M V 3+ 3M H 2 SO 4 Solution 100ml. Its at 80mA / cm 2 The initial efficiencies (current efficiency (CE), voltage efficiency (VE) and energy efficiency (EE)) at 1000 and the efficiency at the 1000th cycle are summarized in Table 1. Compared with the first cycle, the voltage efficiency of the all-vanadium redox flow battery in this embodiment decreases from 89.4% to 84.6% at the 1000th cycle, and the energy efficiency drops to 79.4%. Subsequently, stop the charge and discharge cycle of the battery, connect the positive electrode electrolyte inlet and outlet of the battery with the negative electrode electrolyte after the battery cycle, and then connect the negative electrode electrolyte inlet and outlet with the positive electrode electrolyte afte...

Embodiment 2

[0023] A full vanadium redox flow battery using carbon felt as an electrode was subjected to a charge-discharge cycle test, and the positive electrolyte was 1.5MVO 2+ 3M H 2 SO 4 Solution 100ml, negative electrode electrolyte is 1.5M V 3+ 3M H 2 SO 4 Solution 100ml. Its at 80mA / cm 2 The efficiencies of the first cycle and the 1000th cycle are summarized in Table 1. Compared with the first cycle, the voltage efficiency of the all-vanadium redox flow battery in this embodiment decreases from 90.4% to 86.3% at the 1000th cycle, and the energy efficiency drops to 80.7%. Subsequently, the battery was stopped from charging and discharging cycles. Configure 0.5M V 2+ / 1.0M V 3+ 3M H 2 SO 4 Solution 60ml is used as negative electrode electrolyte for regeneration, 1.0M VO 2+ / 0.5M VO 2 + 3M H 2 SO 4 Solution 60ml is used as the positive electrode electrolyte for regeneration, connect the positive electrode electrolyte inlet and outlet of the battery with the negative el...

Embodiment 3

[0025] A vanadium redox flow battery using graphite felt as an electrode was subjected to a charge-discharge cycle test, and the positive electrolyte was 1.5M VO 2+ 3M H 2 SO 4 Solution 100ml, negative electrode electrolyte is 1.5M V 3+ 3M H 2 SO 4 Solution 100ml. Its at 80mA / cm 2 The efficiencies of the first cycle and the 1000th cycle are summarized in Table 1. Compared with the first cycle, the voltage efficiency of the all-vanadium redox flow battery in this embodiment decreases from 85.9% to 82.9% at the 1000th cycle, and the energy efficiency drops to 78.7%. Subsequently, the battery was stopped from charging and discharging cycles. Configure 1.0M V 2+ / 0.5M V 3+ 3M H 2 SO 4 Solution 60ml is used as negative electrode electrolyte for regeneration, 0.5M VO 2+ / 1.0M VO 2 + 3M H 2 SO 4 Solution 60ml is used as the positive electrode electrolyte for regeneration, connect the positive electrode electrolyte inlet and outlet of the battery with the negative elec...

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Abstract

A method for regenerating the electrode activity of an all-vanadium redox flow battery. When the voltage efficiency of the all-vanadium redox flow battery after operation is lower than the initial voltage efficiency of the all-vanadium redox flow battery, the all-vanadium redox flow battery system is stopped, and the battery's The inlet and outlet of the positive electrode electrolyte are connected with the container filled with the negative electrode electrolyte, and the inlet and outlet of the negative electrode electrolyte of the all-vanadium redox flow battery are connected with the container filled with the positive electrode electrolyte. The electrode regenerated by this method can make the electrode after long-term work obtain the same electrocatalytic activity as the initial electrode, so that its voltage efficiency and energy efficiency can be restored to the initial value, which can greatly prolong the service life of the all-vanadium redox flow battery, and the operation is simple , without dismantling the stack to take out the electrode material for processing, which can reduce maintenance costs.

Description

technical field [0001] The invention relates to the field of liquid flow battery electrodes, in particular to an electrode activation method for an all-vanadium redox flow battery. Background technique [0002] Due to its independent output power and capacity, the all-vanadium redox flow battery has flexible system design; high energy efficiency, long life, high operation stability and reliability, and low self-discharge; large degree of freedom in site selection, no pollution, and simple maintenance. With the advantages of low operating cost and high security, it has broad development prospects in large-scale energy storage. It is considered to be an effective method to solve the random and intermittent unsteady characteristics of renewable energy power generation systems such as solar energy and wind energy. There are significant demands in power generation and smart grid construction. [0003] However, after long-term operation of the all-vanadium redox flow battery, its...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/18
CPCY02E60/50
Inventor 刘涛张华民李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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