Preparation method of metal-carbon nano tube compounded porous electrode material

Abstract

The invention discloses a preparation method of a metal-carbon nano tube compounded porous electrode material. The preparation method comprises the following steps: depositing a transition metal layer on a porous metal material, and then growing carbon nano tubes on the transition metal layer by taking the transition metal layer as a catalyst. The preparation method has the advantages that the carbon nano tubes growing on the porous substrate have less impurities, and are uniform, orderly, and high in consistency; the prepared electrode material is high in specific surface area and conductibility, and long in service life; the preparation process of the material is stable and efficient, so that convenience is brought for continuous production.

Description

technical field [0001] The invention relates to a preparation method of a porous electrode material, in particular to a preparation method of a metal-carbon nanotube composite porous electrode material. Background technique [0002] Electric energy is an indispensable secondary energy in human life and production in modern society. With the continuous development of social economy, its proportion is getting higher and higher. At present, in order to cope with the depletion of fossil energy and for the consideration of environmental protection, people are developing and utilizing renewable clean energy such as wind energy, water energy, and solar energy more and more widely. However, due to the limitation of natural conditions, the use of wind energy and Solar power generation is intermittent and not continuous. While reducing the construction scale of original power plants and increasing the proportion of renewable energy systems, in order to meet people's production and li...

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Problems solved by technology

[0005] In the prior art, there are mainly two types of related electrode materials that use carbon nanotubes and porous metal composites: the first is to mix carbon nanotubes with battery active materials and dry press or make a slurry and coat them on a porous metal substrate In general, the specific surface area of ​​the electrode prepared by this method has not been significantly improved, and the bonding force between the carbon nanotube and the matrix is ​​poor, and it is easy to peel under harsh application conditions.

The second is to grow carbon nanotubes on the surface of porous metals. 3 Al alloy catalyzed method for preparing carbon nanotubes", and the application publication number is CN104577059 "Method for directly growing carbon nanotubes on foamed nickel substrate to prepare battery electrodes") The technical scheme is to directly grow carbon nanotubes on the porous metal surface, which is This method is selective to the substrate, and only metals that can catalyze carbon nanotubes can be selected, and the obtained carbon nanotubes have poor uniformity in diameter and size, and the surface orientation is disordered, intertwined, and aggregated into groups, making the gap between the channels The connection is disordered, which seriously affects the migration rate of electrolyte ions in the pores of the electrode material, thereby reducing the output power of the capacitor; some (patent No. CN103253648 "a method for growing carbon nanotubes on nickel foam" , and the application publication number is CN102709569 "porous metal composite material") technical scheme is to form a layer of catalyst on the surface of the porous metal, and then grow carbon nanotubes on the catalyst, because it takes a long time to prepare the catalyst layer Heat treatment will cause the catalyst particles to agglomerate and form an alloy with the base metal at the same time, which will affect the catalytic performance of the catalyst and make the uniformity and consistency of the carbon nanotubes poor, which may lead to the deposition of amorphous carbon and affect the performance of the electrode.

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