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Porous carbon fiber paper electrode material for all-vanadium redox flow battery, and preparation and application thereof

An all-vanadium redox flow battery and porous carbon fiber technology, applied in fuel cells, circuits, electrical components, etc., can solve the problems of low electrocatalytic activity and large thickness of all-vanadium redox flow battery electrodes, and achieve improved specific surface area and high practicality. value, the effect of reducing electrochemical polarization

Active Publication Date: 2017-04-12
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

[0008] In order to solve the problems of large electrode thickness and low electrocatalytic activity of all-vanadium redox flow batteries, the present invention provides a highly active porous carbon fiber paper electrode material for all-vanadium redox flow batteries and its preparation method

Method used

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  • Porous carbon fiber paper electrode material for all-vanadium redox flow battery, and preparation and application thereof
  • Porous carbon fiber paper electrode material for all-vanadium redox flow battery, and preparation and application thereof
  • Porous carbon fiber paper electrode material for all-vanadium redox flow battery, and preparation and application thereof

Examples

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Embodiment 1

[0050] Prepare polyacrylonitrile-based chopped carbon fibers with a length of 10mm, degumming them in an acetone solution, and then put them into an aqueous solution containing 0.1% polyethylene oxide dispersant for beating to form polyacrylonitrile-based carbon fiber slurry, Then it is copied by wet forming equipment to make the weight per unit area 40g / m 2 carbon paper precursor; after that, immerse it in an ethanol solution with a phenolic resin concentration of 1% for 30min, and then heat-press at 200°C to obtain a carbon paper base paper at a pressure of 6 MPa after drying; The paper base paper is put 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 were 40ml / min and 200ml / min, respectively, and the constant temperature was reacted for 30min;...

Embodiment 2

[0059] Prepare a pitch-based chopped carbon fiber with a length of 15mm, degumming it in an acetone solution, and then put it into an aqueous solution containing 0.05% polyacrylamide dispersant for beating to form a pitch-based carbon fiber slurry, and then wet Forming equipment is copied to form a unit area weight of 50g / m 2 carbon paper precursor; after that, immerse it in an ethanol solution with a phenolic resin concentration of 1% for 30 minutes, and then heat-press at 180°C to obtain a carbon paper base paper at a pressure of 5 MPa after drying; The paper base paper is put 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 were 10ml / min and 200ml / min respectively, and the reaction was carried out at constant temperature for 30min;...

Embodiment 3

[0062] Prepare viscose-based chopped carbon fibers with a length of 10 mm, degumming them in an acetone solution, and putting them into an aqueous solution containing 0.05% polyacrylamide dispersant for beating to form viscose-based carbon fiber slurry, and then The weight per unit area of ​​wet forming equipment is 50g / m 2 carbon paper precursor; after that, immerse it in an ethanol solution with a phenolic resin concentration of 0.5%, soak for 30min, and then heat-press at 180°C to obtain a carbon paper base paper at a pressure of 5MPa after drying; The paper base paper is put into the electric furnace, under N 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 were 20ml / min and 200ml / min respectively, and the reaction was carried out at constant temperature for 30min; then cooled to room t...

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Abstract

The invention provides a porous carbon fiber paper electrode material for an all-vanadium redox flow battery. The porous carbon fiber paper electrode material has a thickness of 50 to 1000 [mu]m and is composed of a carbon fiber with a diameter of 5 to 20 [mu]m; porous carbon fiber paper has a porosity of 60 to 90%; the surface of the carbon fiber is of a porous structure, and the carbon fiber has a specific surface area of 5 to 50 m<2> / g and a pore size of 50 to 2000 nm. By the porous carbon fiber paper, the specific surface area and oxygen-containing function groups are increased, and the electrocatalytic activity of carbon fiber material to an oxidation reduction reaction of vanadium ions can be substantially improved. The electrode material provided by the invention is applicable to the all-vanadium redox flow battery, and can reduce space between the electrodes and internal resistance of the battery, lower charge transfer resistance and improve the voltage efficiency and energy efficiency of the all-vanadium redox flow battery, so the working current density of the battery is improved, and battery weight, size and cost are greatly reduced under the condition of 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): H01M8/0234
CPCH01M8/0234Y02E60/50
Inventor 刘涛张华民李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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