Preparation method of tin-dioxide-supported carbon nanorod material

Abstract

The invention discloses a preparation method of a tin-dioxide-supported carbon nanorod material. The method comprises the following steps: by using a cellulose raw material as the substrate, treating cellulose by an acid catalysis process to remove amorphous regions and impurity components in the cellulose, extracting a cellulose nanocrystal suspension, carrying out chemical supporting on the cellulose nanocrystals by using tin chloride to prepare tin-containing cellulose nanocrystals, and carrying out high-temperature oxidation-carbonization treatment to prepare the high-length-diameter-ratio tin-dioxide-supported carbon nanorod material of which the diameter is 10-30nm and the length is 150-350nm. By effectively utilizing the biomass material cellulose, the method has the characteristics of wide raw material sources, renewable raw material and no pollution. The carbon nanorods have the advantage of excellent electric conductivity and have the size which is not possessed by the past carbon material, and have favorable effects of relieving the volume change and improving the cycle performance of batteries.

Description

technical field [0001] The invention belongs to the field of preparation of lithium-ion battery negative electrode materials, in particular to a method for a tin dioxide-loaded carbon nanorod material. Background technique [0002] With the development of society, the challenges of environmental pollution and energy crisis are becoming increasingly severe, and green energy has become a research and development hotspot in countries all over the world. As a new type of clean rechargeable power source, lithium-ion batteries have the advantages of light weight, low pollution, high working voltage, high energy density, and long cycle life. They have shown broad application prospects in the fields of national defense, electric vehicles, and electronics. Known as the ideal power supply in the 21st century. [0003] In lithium-ion batteries, the negative electrode material is one of the important factors affecting the battery capacity and service life. The current commercial lit...

AI Technical Summary

Problems solved by technology

However, the lithium storage process of tin dioxide is realized through the repeated intercalation and extraction of lithium ions. Based on the characteristics and mechanism of this process, the volume change and irreversible capacity loss of tin dioxide electrodes cannot be completely avoided.

Although there have been a lot of research reports on the nanonization of tin dioxide anode materials and their composites with various carbon-based or other materials in previous studies, and they have certain effects on alleviating volume changes and improving cycle performance, but For the first time, the problems of large irreversible capacity and poorer cycle stability than carbon materials have not been fundamentally resolved. This is also a common problem faced by most non-carbon anode materials at present.