Oxide nanotube composite carbon-based electrode material and preparation method thereof

Abstract

The invention relates to an oxide nanometer pipe composite carbon base electrode material of super capacitor and it's preparing method. Wherein the electrode material comprises following components: the metal oxide nanometer pipe in 0.1-20 mass%, the conductive carbon black in 0.1-15 mass%, the nanometer metal in 0.1-8 mass%, the activated carbon in 0.1-99 mass%, and the nanometer activated carbon fiber in 0.1-99 mass%. Based on the activated carbon with high rate of surface area and the nanometer activated carbon fiber, said electrode material utilizes the metal oxide nanometer pipe and three-dimensional network cage construction formed by said metal oxide nanometer pipe to supply the transmission channel of hydronium of electrolyte, which can markedly improve the effective rate of surface area of electrode activated material to improve the capacity density of said electrode material, to attain the super capacitor with high energy density. And The invention has lower cost and supports the commercial application.

Description

technical field [0001] The invention relates to an oxide nanotube composite carbon-based electrode material and a preparation method thereof, in particular to an oxide nanotube composite carbon-based electrode material for supercapacitors and a preparation method thereof. technical background [0002] The energy crisis and environmental pollution have become the focus of the world's governments and scientific circles. Vigorously researching and developing clean and efficient new power sources is one of the effective ways to solve the energy crisis and environmental pollution. Among them, supercapacitors combine energy and A new type of green energy device with unified environmental protection, accelerating the wide application of supercapacitors in the fields of electric power, communications, and electric vehicles has important strategic significance for environmental protection, alleviating energy shortages and other major social issues, as well as significant social and ec...

AI Technical Summary

Problems solved by technology

[0008] Chinese patent CN1357899A discloses a supercapacitor electrode material, which is composed of carbon nanotubes and metal oxides. Due to the high conductivity, high specific surface area, and high microporosity of carbon nanotubes, it can be obtained by combining with metal oxides. High energy density and power density, but carbon nanotubes are expensive, and there is a problem of high production costs

[0009] U.S. Patent No. 6,198,623 proposes a self-supporting electrode material using activated carbon fibers with a high specific surface area as a supercapacitor. Although the electrode material has the advantages of well-developed micropores and easy electrolyte infiltration, due to the electrical conductivity of the activated carbon fiber itself compared to metal nickel At the same time, because it mainly relies on electric double layer capacitance and a small amount of Faraday quasi-capacitance to store energy, and the utilization rate of micropores is still limited to a certain level, it has the disadvantages of poor conductivity and low energy density.

[0010] Chinese patent CN1402272A discloses a preparation method of activated carbon electrode material, which adopts the mode of supporting transition metals to increase the capacity density of the electrode material, but the capacity density of the material is mainly increased by metal ions entering the micropores to form pseudocapacitance, while for The pore size distribution itself has no effect, so it does not contribute to the improvement of the capacitance of the double-point layer. Therefore, it is necessary to further improve the pore size distribution to improve the electric double layer capacitance.

[0011] From the above analysis, it can be seen that carbon-based electrode materials such as carbon nanotubes have low effective porosity, low energy density and high cost, which limit the application range of supercapacitors. Therefore, the development of low-cost and high-capacity-density metals Oxide nanotube composite carbon-based electrode materials have become an effective way to increase the capacity density of supercapacitors and realize a wide range of commercial applications in the field of renewable energy and power systems