Preparation method for carbon-coated super-long titanium dioxide nanotube negative electrode material of lithium ion battery

Abstract

The invention discloses a preparation method for a carbon-coated super-long titanium dioxide nanotube negative electrode material of a lithium ion battery. The preparation method comprises the following steps of preparing a titanic acid nanotube by a hydrothermal method, and acidizing the titanic acid nanotube to obtain a hydrogen-based tube; dissolving the obtained hydrogen-based tube in ethanol, adding an organic macromolecular ethanol solution, and then carrying out low-temperature stirring to obtain macromolecular-coated hydrogen-based tube serving as a carbon-coated titanium dioxide nanotube precursor; and carrying out high-temperature thermal treatment on the precursor under the production of an inert gas to obtain the carbon uniformly-coated super-long titanium dioxide nanotube negative electrode material of the lithium ion battery. The preparation method has the advantages of simplicity in process, easiness in operation, material availability, low cost and environmental friendliness, no special device is needed in the whole reaction process, industrial production is promoted, and the quality of the finally-obtained product is relatively high; and with a high-conductive phase substance composite nano tubular structure prepared according to the method, the ion transmission distance can be shortened, the conductivity of the material and the ion diffusion rate of the material are improved, so that the material has excellent rate capability, stable cycle performance and high coulombic efficiency. The material prepared according to the method is an ideal lithium ion negative electrode material having wide commercial application prospect.

Description

technical field [0001] The invention belongs to the field of preparation and application of new energy materials, specifically a kind of amorphous carbon-coated TiO with good crystallinity based on macromolecular coating synthesis, excellent rate performance, high Coulombic efficiency and stable cycle performance. 2 nanotube method. Background technique [0002] Titanium dioxide, as a "zero strain" material, hardly changes its structure during charging and discharging. It has the advantages of high safety, stable cycle performance, abundant resources, low price, and environmental friendliness, making it a promising development prospect for lithium-ion batteries. negative electrode material. However, titanium dioxide has low conductivity (~10 -13 Scm -1 ), resulting in poor rate performance, especially in the fields of electric vehicles and large energy storage batteries, which are greatly limited. Therefore, improving the conductivity of titanium dioxide electrode materi...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned defects in the prior art, a simple and environment-friendly method for preparing titanium dioxide nanotubes with highly conductive phase materials for lithium-ion battery anode materials is provided. The strength suppresses the expansion of the tube structure and carbonizes itself into amorphous carbon, thereby obtaining well-crystallized titanium dioxide nanotubes uniformly coated with carbon, shortening the diffusion distance between lithium ions and electrons, and increasing the electrodes and electrolytes through the large specific surface area of ​​nanotubes The contact area between them is improved by the highly conductive amorphous carbon, which ultimately improves the rate performance, Coulombic efficiency and cycle performance to meet the current demand for lithium-ion batteries.

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