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Production method for modified vanadium battery porous electrode graphite felt

A production method and porous electrode technology, applied to battery electrodes, circuits, electrical components, etc., can solve the problems of battery life termination, reduce the negative electrode reaction rate, accelerate battery capacity, etc., and achieve the improvement of current and voltage efficiency and electrochemical activity. , The effect of reducing the internal resistance of the battery

Inactive Publication Date: 2019-11-29
LIAONING JINGU CARBON MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, the side reaction of hydrogen evolution is easy to cause the surface of the material to be etched. On the other hand, the oxygen-containing functional groups on the surface of the material are consumed, which reduces the active sites and reduces the reaction rate of the negative electrode. The Coulombic efficiency and energy efficiency of the battery are also greatly reduced, which accelerates the battery capacity. The attenuation of the battery can even lead to premature termination of battery life

Method used

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  • Production method for modified vanadium battery porous electrode graphite felt
  • Production method for modified vanadium battery porous electrode graphite felt
  • Production method for modified vanadium battery porous electrode graphite felt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The polyacrylonitrile-based pre-oxygenated felt (thickness is 12mm, density is 0.12g / cm 3 ), enter the low-temperature carbonization zone and high-temperature graphitization zone of the continuous sintering furnace sequentially through the conveyor belt (moving speed is 0.083m / min) for sintering and continuous activation furnace activation treatment. In the sintering process, the flow rate is 500m 3 / h nitrogen protective gas, so that the production can be carried out stably. In the sintering furnace, the furnace temperature is 750-1350°C, which is the carbonization zone, and the furnace temperature is 1800-2400°C, which is the high-temperature graphitization zone; after sintering in the high-temperature graphitization zone, it becomes graphite felt; when the graphite felt cools down to 100-150°C, First sprinkle 6% catalyst bismuth nitrate powder evenly on the surface of the graphite felt, then send the graphite felt into the continuous activation furnace, the furnace ...

Embodiment 2

[0050] The polyacrylonitrile-based pre-oxygenated felt (thickness is 11mm, density is 0.10g / cm 3 ), the production method is the same as in Example 1, the conveyor belt travel speed is 0.089m / min, and the flow rate of argon gas introduced in the sintering process is 400m 3 / h, sprinkle 5% bismuth nitrate powder evenly on the surface of the graphite felt, and then send it into a continuous activation furnace for activation, while feeding carbon dioxide at a rate of 200m 3 / h, after 280 minutes of activation, the material drops to room temperature and becomes the finished product.

Embodiment 3

[0052] The viscose-based pre-oxygenated felt (thickness is 8mm, density is 0.133g / cm 3 ), enter the low-temperature carbonization zone and high-temperature graphitization zone of the continuous sintering furnace sequentially through the conveyor belt (moving speed is 0.1m / min) for sintering and continuous activation furnace activation treatment. In the sintering process, the flow rate is 300m 3 / h nitrogen protective gas, so that the production can be carried out stably. In the sintering furnace, the furnace temperature is 750-1350°C, which is the carbonization zone, and the furnace temperature is 1800-2200°C, which is the high-temperature graphitization zone; after sintering in the high-temperature graphitization zone, it becomes graphite felt; when the graphite felt cools to 100-150°C, First sprinkle 3% catalyst bismuth nitrate powder evenly on the surface of the graphite felt, then send the graphite felt into the continuous activation furnace, the furnace body is gradually...

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Abstract

The invention relates to a production method for a modified vanadium battery porous electrode graphite felt, which comprises the following steps: a pre-oxidized felt sequentially enters a low-temperature carbonization zone and a high-temperature graphitization zone of a continuous sintering furnace to be sintered, and then enters a continuous activation furnace to be activated; before the graphitefelt is subjected to activating treatment, a catalyst bismuth nitrate powder is uniformly scattered on the surface of the graphite felt, so that one-catalyst and two-step modification effect can be realized. That is, the added bismuth nitrate not only can oxidize the surface of the felt body to form a nanoscale microporous structure and increase the specific surface area, but also the bismuth nitrate can be decomposed in the activation process, and the decomposed product is deposited on the surface of the carbon felt to further modify the surface of the carbon felt. The production method hasthe advantages that the electrochemical reaction activity can be improved, the side reaction of the electrode can be inhibited, and the service life of the battery is prolonged. The cost is saved in industrial production, and the method is simple, easy to operate and high in environmental protection property.

Description

technical field [0001] The invention belongs to the technical field of electrode material production methods, in particular to a production method of modified vanadium battery porous electrode graphite felt. Background technique [0002] With the development of industrialization, the drawbacks of massive use of fossil fuels such as coal and oil in the early development of human beings have emerged. The reduction of these non-renewable resources and the environmental pollution caused by the use process and the resulting climate change are threatening the normal production of human beings. Life is a common challenge faced by mankind. New energy power generation systems such as water energy, wind energy, biomass energy, solar energy, and geothermal energy have the advantages of abundant resources, renewable energy, little impact on the environment, and wide distribution. Continuous energy supply cannot be achieved. The development of energy storage technology can convert unst...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/96
CPCH01M4/8882H01M4/96Y02E60/50
Inventor 李波刘东影邢阳阳董跃孙琦李鹏
Owner LIAONING JINGU CARBON MATERIALS CO LTD
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