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Composite carbon electrode for all-vanadium flow battery and preparation method thereof

An all-vanadium redox flow battery and composite carbon technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of not being suitable for large-scale application of vanadium batteries, reducing battery performance, and decreasing mechanical strength.

Inactive Publication Date: 2014-03-26
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research results show that the cost of metal electrodes is high, and they are prone to passivation after long-term use, which reduces battery performance and is not suitable for large-scale application in vanadium batteries; composite conductive plastics are mainly polymer substances mixed with conductive agents (graphite powder, acetylene, etc.) in a certain proportion. Black) mixed and pressed into tablets; carbon electrodes, mainly including graphite felt, carbon paper, carbon felt, carbon cloth, etc., are directly used in vanadium batteries and the electrochemical activity is not high enough
[0004] At present, there are many modification methods for carbon materials, including liquid phase oxidation treatment, thermal oxidation treatment in atmosphere or electrochemical activation treatment, but these methods are very limited for improving the specific surface area of ​​carbon materials
Although the electrochemical activity can be improved after modification, the current density is still small, and the mechanical strength drops significantly, so the battery performance and battery life still need to be greatly improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Using graphite felt as the base material, it was heated in concentrated HNO 3 After soaking for 10 minutes, rinse and dry with deionized water. Place the treated graphite felt in the magnetron sputtering equipment, select the Fe target material, and take it out after sputtering for 10 minutes.

[0010] Place the above-mentioned graphite felt loaded with Fe catalyst particles in a high-temperature reaction furnace, under N 2 Under protection, pass into H 2 , to raise the temperature of the reaction furnace, when the temperature in the furnace rises to 700°C, CH 4 gas while controlling CH 4 / H 2 The flow ratio is 4:1. After reacting for 15min, close the CH 4 , at N 2 Under the protection of the reactor, the reaction furnace was cooled to room temperature to obtain a graphite felt with a carbon nanotube array layer deposited on the surface, which can be used as an electrode material for an all-vanadium redox flow battery.

Embodiment 2

[0012] Using carbon paper as the base material, it was treated with concentrated HNO 3 After soaking for 10 minutes, rinse and dry with deionized water. Place the treated carbon paper in the magnetron sputtering equipment, select Fe-Ni alloy target material, and take it out after sputtering for 15 minutes.

[0013] Place the above-mentioned carbon paper loaded with Fe catalyst particles in a high-temperature reaction furnace, under N 2 Under protection, pass into H 2 , to raise the temperature of the reaction furnace, when the temperature in the furnace rises to 750°C, the C 2 h 2 gas while controlling C 2 h 2 / H 2 The flow ratio is 4:1. After reacting for 60min, close the C 2 h 2 , at N 2 Under the protection of the reactor, the reaction furnace was cooled to room temperature, and the carbon paper with a carbon nanotube array layer deposited on the surface was obtained, which can be used as an electrode material for an all-vanadium redox flow battery.

Embodiment 3

[0015] Using carbon felt as the base material, soak it in the mixed acid of concentrated nitric acid and concentrated sulfuric acid with a volume ratio of 5:4 for 10 minutes, and then wash and dry it with deionized water. Place the treated carbon felt in a magnetron sputtering device, select Ni target material, and take it out after sputtering for 10 minutes.

[0016] Place the above-mentioned carbon felt loaded with Fe catalyst particles in a high-temperature reaction furnace, under N 2 Under protection, pass into H 2 , to raise the temperature of the reaction furnace, when the temperature in the furnace rises to 750°C, CH 4 gas while controlling CH 4 / H 2 The flow ratio is 4:1. After reacting for 20min, close the CH 4 , at N 2 Under the protection of the reactor, the reaction furnace was cooled to room temperature to obtain a carbon felt with a carbon nanotube array layer deposited on the surface, which can be used as an electrode material for an all-vanadium redox flo...

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Abstract

The invention relates to a composite carbon electrode material for an all-vanadium flow battery and a preparation method of the composite carbon electrode material. The electrode material for the all-vanadium flow battery is made into a composite carbon electrode by directly growing a carbon nano-tube array on a carbon element substrate. The preparation process comprises the following steps of (1) precipitating a catalyst for growing the carbon nano-tube on the carbon element substrate by adopting a magnetron sputtering method; and (2) placing the carbon element substrate with the catalyst into a high-temperature reaction furnace, and preparing the carbon nano-tube array layer through a chemical vapor deposition method. The specific surface area, the electrochemical activity and the mechanical strength of the composite carbon electrode material for the vanadium flow battery prepared by adopting the preparation method are obviously improved, so that the battery property of the all-vanadium flow battery is improved, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the field of all-vanadium redox flow energy storage batteries, and in particular relates to a composite carbon electrode for all-vanadium redox flow batteries and a preparation method thereof. Background technique [0002] All-vanadium flow battery, based on VO 2 - / VO 2 + and V 2+ / V 3+ A redox flow battery in which the electric pair serves as the positive and negative electrodes of the battery, respectively. Compared with other storage batteries, vanadium flow energy storage batteries have high energy efficiency, large storage capacity, flexible system design, long life of active materials, ultra-deep discharge without causing irreversible damage to the battery, and the materials for battery components are relatively cheap and easy to obtain , The system site selection is free, the construction period is short, and the system operation and maintenance costs are low. Due to its outstanding advantages in terms of cost an...

Claims

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Application Information

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IPC IPC(8): H01M4/96H01M4/88
CPCY02E60/50H01M4/8817H01M4/8871H01M4/8882H01M4/96
Inventor 张晶安瑞生王修春马婕刘硕安丰恺伊希斌
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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