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Method for improving electrochemical activity of negative electrode of all-vanadium redox flow battery

An all-vanadium redox flow battery and a negative electrode electrolyte technology are applied in the all-vanadium redox flow energy storage battery, in the field of improving the electrochemical activity of the negative electrode of the all-vanadium redox flow battery, and can solve the problems of increasing production costs, increasing electrode material preparation steps, and the like. , to achieve the effect of improving conductivity, improving electrochemical activity and electrochemical reversibility, and improving voltage efficiency and energy efficiency

Pending Publication Date: 2021-06-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method effectively improves the electrocatalytic activity of the electrode material, it increases the preparation steps of the electrode material and increases the production cost.

Method used

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  • Method for improving electrochemical activity of negative electrode of all-vanadium redox flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The traditional all-vanadium redox flow battery positive electrolyte is 1.5M VO 2+ 3M H 2 SO 4 solution, the negative electrode electrolyte is 1.5MV 3+ 3M H 2 SO 4 solution. Weigh a certain amount of AgNO 3 After making an aqueous solution, add it to the negative electrode electrolyte, ultrasonically disperse it for 30 minutes to completely dissolve it, and Ag + The concentration is controlled at 0.01M.

Embodiment 2

[0030] The traditional all-vanadium redox flow battery positive electrolyte is 1.5M VO 2+ 3M H 2 SO 4 solution, the negative electrode electrolyte is 1.5MV 3+ 3M H 2 SO 4 solution. Weigh a certain amount of Ag 2 SO 4 After making a solution, add it to the negative electrode electrolyte, ultrasonically disperse it for 30 minutes to completely dissolve it, and the Ag + The concentration is controlled at 0.005M.

[0031] The single cell assembly evaluation conditions are the same as in Example 1, except that the difference from Example 1 is that the all-vanadium redox flow battery using the negative electrolyte of this example has a current density of 100mA / cm 2 , the voltage efficiency and energy efficiency were 89.8% and 84.6%, respectively, significantly improved compared with the standard negative electrolyte.

Embodiment 3

[0033] The traditional all-vanadium redox flow battery positive electrolyte is 1.5M VO 2+ 3M H 2 SO 4solution, the negative electrode electrolyte is 1.5MV 3+ 3M H 2 SO 4 solution. Weigh a certain amount of AgNO 3 After making a solution, add it to the negative electrode electrolyte, and ultrasonically disperse it for 60 minutes to completely dissolve it. + The concentration is controlled at 0.001M.

[0034] The single cell assembly evaluation conditions are the same as in Example 1, except that the difference from Example 1 is that the all-vanadium redox flow battery using the negative electrolyte of this example has a current density of 100mA / cm 2 , the voltage efficiency and energy efficiency were 89.5% and 84.3%, respectively, which were significantly improved compared with the comparative example.

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Abstract

According to a method for improving the electrocatalytic activity of the negative electrode of an all-vanadium redox flow battery, a certain amount of silver ions are added into the negative electrode electrolyte of the all-vanadium redox flow battery, so that the electrochemical activity of a V <2+> / V<3+> reaction is improved, the electrochemical polarization of a redox flow energy storage battery is reduced, meanwhile, the electrode internal resistance can be reduced, and the voltage efficiency, the energy efficiency and the working current density of the battery are improved.

Description

technical field [0001] The invention relates to the field of liquid flow energy storage batteries in chemical energy storage technology, in particular to an all-vanadium redox flow energy storage battery, and provides a method for improving the electrochemical activity of the negative electrode of the 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 safety, 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 sign...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18H01M10/42
CPCH01M8/188H01M10/4235Y02E60/10Y02E60/50
Inventor 刘涛李先锋张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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