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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  • 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 preparatio

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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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Example Embodiment

[0031] Example 1

[0032] Put a certain size of polyacrylonitrile-based pre-oxygenated felt into the electric furnace, 2 Under the atmosphere, the temperature is increased to 1600°C at a heating rate of 10°C / min, and the temperature is kept constant for 1h; then the temperature is reduced to 1300°C, and CO is introduced 2 And N 2 Gas mixture, CO 2 And N 2 The flow rates are 40ml / min and 200ml / min respectively, and the reaction is kept at a constant temperature for 30 minutes; and then cooled to room temperature to prepare 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, cyclic voltammetry was performed on the porous carbon fiber felt prepared in Example 1. The porous carbon fiber felt is used as the working electrode, the non-porous graphite plate is used as the counter electrode, and the saturated calomel electrode is used as the reference electrode. The electrochemical tes...

Example Embodiment

[0045] Example 2

[0046] Put a certain size of polyacrylonitrile-based pre-oxygenated felt into the electric furnace, 2 In the atmosphere, the temperature is increased to 1400°C at a heating rate of 5°C / min, and the temperature is kept constant for 1h; then the temperature is 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 reaction is kept at a constant temperature for 30 minutes; and then cooled to room temperature to prepare porous carbon fiber felt.

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

Example Embodiment

[0048] Example 3

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

[0050] The single cell assembly evaluation conditions are the same as in Example 1, and the difference from Example 1 is: the all-vanadium flow battery using the activated carbon felt of this example as the electrode has a current density of 80mA / cm 2 When the voltage efficiency and energy efficiency are respectively 89.3% and 84.4%; the current density is increased to 120mA / cm 2 At this time, the voltage efficiency and energy efficiency remained at 84.6% and 8...

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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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