A composite carbon-based electrode material for super capacitor and method for making same

Abstract

The invention discloses a composite carbon-based electrode material used for super capacitors and its preparing method, and it is composed of nano metals, nano metal composite oxide, activated carbon and nano carbon fiber, effectively using the activated carbon with high specific surface area and the nano carbon fiber to provide a double electric layer capacitor for a super capacitor, combining a Faraday quasi-capacitor provided by the nano metal oxide, and at the same time using the high electric conductivity of the nano carbon fiber and nano metals and the nano cooperation effect, thus increasing its capacitor and power densities and able to obtain the super capacitors with high energy and power densities, and the invention is low-cost and easy for commercial application.

Description

technical field [0001] The invention relates to an electrode active material for a supercapacitor and a preparation method thereof, belonging to the field of material science, in particular to the field of electrochemical technology. technical background [0002] On a global scale, energy, as one of the pillar industries of modern human civilization, has been paid more and more attention by people. At the same time, the environmental problems caused by the emission of various waste gases produced by energy and the greenhouse effect have become the most concerned hot spot in the world, and it is also an increasingly profound social problem. Harsh environmental pollution not only poses a serious threat to human and biological living space, but also leaves endless hidden dangers for future generations. Scientists and people of insight all over the world have appealed to governments and industrial departments of various countries to protect the earth's environment and the livin...

AI Technical Summary

Problems solved by technology

[0011] Although there are many types of carbon-based electrode materials and their preparation methods, such as Amatucci and Glenn G. in US6198623, carbon fibers with high specific surface area are used as self-supporting electrode materials for supercapacitors. Although this electrode material has the advantages of well-developed micropores and easy electrolyte infiltration , but because the conductivity of carbon fiber itself is worse than that of metal nickel, and because it mainly relies on electric double layer capacitance and a small amount of Faraday quasi-capacitance to store energy, it has the disadvantages of poor conductivity and low energy density; Sato Takaya et al. Japanese patent JP008890 / 2001 and Chinese patent application CN1379497A describe an electrode material for batteries or supercapacitors, using carbonaceous materials such as acetylene black as a conductive agent, and using fine-grained conductive powder to adhere to the surface of the carbonaceous material. The active material powder mixture is formed. Since no metal oxide is introduced into the mixture, the electrode material mainly uses the electric double layer energy storage mechanism and a small amount of Faraday quasi-capacitance to store energy, which ultimately leads to the limitation of the energy density of the electrode material at a low level. Disclosed a kind of treatment method of active carbon in Chinese patent application CN1404082A such as Tang Minhong, mainly is that metal ion is carried out underpotential deposition on active carbon surface with the form of ion solution, improves its energy density to provide Faraday's quasi-capacitance, and because The ion concentration is low, so that the deposition amount of metal ions on the surface of activated carbon is low, which eventually leads to low Faraday quasi-capacitance generated by the underpotential deposition of metal ions. At the same time, this method has the disadvantages of long processing period and high cost; Chinese patent Application CN1357899A discloses a supercapacitor electrode material, which is composed of carbon nanotubes and metal oxides. Due to the high electrical conductivity, high specific surface area, and high microporosity of carbon nanotubes, they can be combined with metal oxides to obtain higher Energy density and power density, but carbon nanotubes are expensive, and there is a problem of high production costs

[0012] From the above analysis, it can be known that carbon nanotubes, noble metal oxides, and noble metal oxide composite carbon-based electrode materials have high capacity density and power density, but due to their high cost, they do not currently have commercial application value.