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All-vanadium flow battery porous carbon fiber felt electrode material and preparation and application thereof

A technology of all-vanadium redox flow battery and porous carbon fiber, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problem of low electrocatalytic activity of electrode materials, achieve high practical value, reduce volume, and improve electrocatalytic activity.

Inactive Publication Date: 2016-07-13
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

[0007] In order to solve the problem of low electrocatalytic activity of the electrode material, the present invention provides a method for preparing a highly active porous carbon fiber felt electrode material for an all-vanadium redox flow battery, which does not need to go through multiple processes of carbonization, graphitization and activation, and the preparation process is simple. less, can reduce production cost, the electrode material prepared by this method is composed of porous carbon fibers, has a high specific surface area and surface oxygen-containing functional groups, can significantly reduce the electrochemical polarization of the flow energy storage battery, and increase the working current of the battery density

Method used

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  • All-vanadium flow battery porous carbon fiber felt electrode material and preparation and application thereof
  • All-vanadium flow battery porous carbon fiber felt electrode material and preparation and application thereof
  • All-vanadium flow battery porous carbon fiber felt electrode material and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Put a certain size of polyacrylonitrile-based pre-oxidized felt into the electric furnace, under N 2 Under the atmosphere, the temperature was raised to 1600°C at a heating rate of 10°C / min, and the temperature was kept constant for 1 hour; then the temperature was lowered to 1300°C, and CO 2 and N 2 gas mixture, CO 2 and N 2 The flow rates are 40ml / min and 200ml / min, respectively, and the constant temperature is reacted for 30min; then cooled to room temperature to make a porous carbon fiber felt.

[0033] In order to test the electrochemical activity of the vanadium ion redox couple on the surface of the activated carbon felt, a cyclic voltammetry test was carried out on the porous carbon fiber felt prepared in Example 1. The porous carbon fiber felt was used as the working electrode, the non-porous graphite plate was used as the counter electrode, and the saturated calomel electrode was used as the reference electrode. The electrochemical testing instrument used w...

Embodiment 2

[0046] Put a certain size of polyacrylonitrile-based pre-oxidized felt into the electric furnace, under N 2 Under the atmosphere, the temperature was raised to 1400°C at a heating rate of 5°C / min, and the temperature was kept constant for 1 hour; then the temperature was lowered to 800°C, and water vapor and N 2 mixture of gas, water vapor and N 2 The flow rates are 10ml / min and 200ml / min, respectively, and the constant temperature is reacted for 30min; then cooled to room temperature to make a porous carbon fiber felt.

[0047] The single cell assembly evaluation conditions are the same as in Example 1, except that the difference from Example 1 is that the current density of the all-vanadium redox flow battery using the porous carbon fiber felt of this example as the electrode is 80mA / cm 2 , the voltage efficiency and energy efficiency were 90.8% and 85.4% respectively; the current density increased to 140mA / cm 2 , the voltage efficiency and energy efficiency remained at 85...

Embodiment 3

[0049] Put a viscose-based pre-oxygenated felt of a certain size into the electric furnace, 2 Under the atmosphere, the temperature was raised to 1300°C at a heating rate of 5°C / min, and the temperature was kept constant for 1h; then the temperature was kept constant, and CO 2 and N 2 gas mixture, CO 2 and N 2 The flow rates are 20ml / min and 200ml / min, respectively, and the constant temperature is reacted for 30min; then cooled to room temperature to make a porous carbon fiber felt.

[0050] 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 89.3% and 84.4% respectively; the current density increased to 120mA / cm 2 , the voltage efficiency and energy efficiency still remain at 84.6% and 80.1%.

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Abstract

The present invention relates to an all-vanadium flow battery porous carbon fiber felt electrode material comprising 5-20mum porous carbon fiber, the all-vanadium flow battery porous carbon fiber felt electrode material is prepared by introduction of an activated gas while high temperature carbonization, process is simple, and production cost is low. A prepared porous carbon fiber felt has obviously-improved specific surface area and oxygen-containing functional groups, and can significantly improve the electrocatalytic activity of a carbon fiber material to the vanadium redox reaction. The electrode material is applicable to an all-vanadium flow battery, can reduce the charge transfer resistance, improves the all vanadium flow battery voltage efficiency and energy efficiency, thus improving the working current density, and greatly reducing weight, volume and cost of the battery with the same output power.

Description

technical field [0001] The invention relates to the field of liquid flow energy storage batteries in chemical energy storage technology, in particular to electrodes of 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 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 significant demands in power generation and smart grid construction. [0003] At present, the main limitation restricting the commercial...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/96H01M4/88
CPCY02E60/50
Inventor 刘涛张华民许驰李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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