Continuous carbon nanotube-titanium dioxide composite membrane/fiber for electrode material

Abstract

In the invention, a carbon nanotube-titanium dioxide composite membrane / fiber is prepared in one step by a chemical gas phase method, and the assembly of the carbon nanotube and the nucleation and growth of titanium dioxide are finished at the same time to grow a uniform and continuous carbon nanotube-titanium dioxide composite membrane / fiber. The preparation process is simple, the parameter controllability is strong, and the yield is relatively high; the prepared carbon nanotube-titanium dioxide composite membrane / fiber is uniform and continuous in preparation and realizes self-support and adjustable TiO2 content; with a network structure, the carbon nanotube-titanium dioxide composite membrane / fiber has remarkably strong electrical conductivity and excellent electrochemical properties and does not need the treatment of adding a conductive agent, a binder and the like; after simple cutting, the carbon nanotube-titanium dioxide composite membrane / fiber can be directly applied to a lithium battery cathode material and a super capacitor material.

Description

technical field [0001] The invention relates to electrode materials, in particular to an electrode material for lithium-ion batteries or supercapacitors prepared by using continuous carbon nanotube-titanium dioxide composite films / fibers. Background technique [0002] At present, the anode materials of commercial lithium-ion batteries are mainly carbon materials. At high rates, the diffusion of lithium ions is slow, and the internal resistance of the electrode / electrolyte interface increases, which cannot meet the rapidly growing demand for high-rate lithium-ion batteries. Ion batteries cannot meet the safety requirements for future practical applications. Titanium dioxide has become a promising anode material for lithium-ion batteries. Because titanium dioxide has a high potential for lithium ion insertion / deintercalation between Li+ / Li near 1.7V, it essentially avoids the accumulation of Li+, prevents the appearance of dendrites, and greatly improves the safety performanc...

AI Technical Summary

Problems solved by technology

However, the current research on carbon nanotube films is mainly the solution method and the direct growth method: the solution method is basically a post-processing method, and the mechanical properties of the prepared carbon nanotube film are poor, and the yield is low, and the parameters are uncontrollable; direct growth The method is basically an array method. The carbon nanotube film is grown on the substrate or after subsequent treatment, the carbon nanotube film is pulled out from the array, and the conditions are harsh.

For the research of carbon nanotube-titanium dioxide composite film, the substrate method is basically used at present, mostly two-step method, first preparing carbon nanotubes and then precipitating titanium dioxide, or first preparing titanium dioxide and then growing carbon nanotubes, the process is complicated and the prepared The yield of composite membrane is low, and there are many uncontrollable factors

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