A kind of preparation method of highly active electrode material for vanadium redox flow battery

A technology for all-vanadium redox flow batteries and electrode materials, applied in battery electrodes, fuel cells, circuits, etc., can solve the problems of low electrocatalytic activity of electrode materials, achieve high practical value, less process, and easy mass production

Active Publication Date: 2017-07-21
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

[0005] In order to solve the problem of low electrocatalytic activity of electrode materials, the present invention provides a method for preparing high-activity electrode materials for all-vanadium redox flow batteries, which does not need to go through multiple processes of carbonization, graphitization and activation, and the preparation process is simple and less. Reduce production costs. The electrode material prepared by this method has a high specific surface area and surface oxygen-containing functional groups, which can reduce the electrochemical polarization of the flow energy storage battery and increase the working current density of the battery.

Method used

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  • A kind of preparation method of highly active electrode material for vanadium redox flow battery
  • A kind of preparation method of highly active electrode material for vanadium redox flow battery
  • A kind of preparation method of highly active electrode material for vanadium redox flow battery

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Put a 16cm×12cm×1.2cm polyacrylonitrile-based pre-oxygenated felt into the electric furnace, 2 and N 2 The temperature was raised to 1300°C at a rate of 10°C / min under a mixed atmosphere, CO 2 and N 2 The flow rates were 50ml / min and 350ml / min respectively, reacted at constant temperature for 1h, and then cooled to room temperature to prepare activated carbon felt.

[0026] In order to test the electrochemical activity of the vanadium ion redox couple on the surface of the activated carbon felt, the activated carbon felt prepared in Example 1 was subjected to a cyclic voltammetry test. Activated carbon felt was used as the working electrode, a non-porous graphite plate was used as the counter electrode, and a saturated calomel electrode was used as the reference electrode. The electrochemical testing instrument used was the CHI612 electrochemical workstation of Shanghai Chenhua Company. The preparation concentration is 0.1M V(Ⅱ)+0.1M V(Ⅲ)+3M H 2 SO 4 and 0.1M V(Ⅳ)+...

Embodiment 2

[0037] Put a 16cm×12cm×1.2cm polyacrylonitrile-based pre-oxygenated felt into the electric furnace, 2 Under the atmosphere, the temperature was raised to 1500°C at a heating rate of 5°C / min, and then CO 2 , CO 2 and N 2 The flow rates were 100ml / min and 400ml / min respectively, reacted at constant temperature for 1h, and then cooled to room temperature to prepare activated carbon felt.

[0038] The single battery assembly evaluation conditions are the same as in Example 1, and the difference from Example 1 is that: the all-vanadium redox flow battery adopts the activated carbon felt of this example as the electrode, and the current density is 80mA / cm 2 , the voltage efficiency and energy efficiency were 90.4% and 84.7% respectively; the current density increased to 120mA / cm 2 , the voltage efficiency and energy efficiency remained at 84.9% and 80.8%, and compared with Comparative Example 2, the battery performance was greatly improved.

Embodiment 3

[0040] Put the 16cm×12cm×1.2cm viscose-based pre-oxygenated felt into the electric furnace, under N 2 Under the atmosphere, the temperature was raised to 1500°C at a heating rate of 5°C / min, and then CO 2 , CO 2 and N 2 The flow rates were 100ml / min and 400ml / min respectively, reacted at constant temperature for 1h, and then cooled to room temperature to prepare activated carbon felt.

[0041] The single battery assembly evaluation conditions are the same as in Example 1, and the difference from Example 1 is that: the all-vanadium redox flow battery adopts the activated carbon felt of this example as the electrode, and the current density is 80mA / cm 2 , the voltage efficiency and energy efficiency were 88.9% and 84.2% respectively; the current density increased to 120mA / cm 2 , the voltage efficiency and energy efficiency remained at 84.8% and 81.1%.

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Abstract

The invention relates to a preparation method of a highly active electrode material for an all-vanadium redox flow battery, which is prepared by heat-treating a pre-oxygen felt at a high temperature of 1000-1600° C. in an atmosphere containing CO2 through temperature programming. The prepared activated carbon felt has significantly improved specific surface area and hydrophilicity, and can significantly improve the electrocatalytic activity of the carbon fiber material for the redox reaction of vanadium ions. This electrode material is suitable for all-vanadium redox flow batteries, which can reduce the charge transfer resistance, improve the voltage efficiency and energy efficiency of all-vanadium redox flow batteries, thereby increasing its working current density, making the weight, volume and cost of batteries with the same output power are greatly reduced.

Description

technical field [0001] The invention relates to the field of liquid flow energy storage batteries in chemical energy storage technology, in particular to a method for preparing electrodes for all-vanadium redox flow batteries. 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] At present, the main limitation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/96H01M4/88
CPCH01M4/8882H01M4/96H01M8/188Y02E60/50
Inventor 刘涛张华民李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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