Preparation method of tin dioxide/titanium dioxide spherical particle and graphene nanoribbon composite material

Abstract

The invention belongs to the technical field of lithium-ion batteries, and particularly relates to a preparation method of a negative electrode material for the lithium-ion battery, namely a preparation method of a tin dioxide / titanium dioxide spherical particle and graphene nanoribbon composite material. The method comprises the steps of employing potassium stannate and urea as raw materials, synthesizing tin dioxide hollow spheres through a hydrothermal process, and then mixing the tin dioxide hollow spheres with tetrabutyl titanate; preparing tin dioxide / titanium dioxide spherical particles through a sol-gel method; and finally mixing the tin dioxide / titanium dioxide spherical particles with a graphene nanoribbon dispersion liquid to obtain a tin dioxide / titanium dioxide-graphene nanoribbon composite material product. The operation is simple; the cost is low; the method is friendly to environment; and the prepared product has relatively high capacity and excellent cycle performance and can be widely applied to negative electrode materials for high-power lithium-ion batteries and super capacitors.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a lithium ion battery negative electrode material. Background technique [0002] Among the anode materials currently being developed, tin dioxide anode material is regarded as a potential anode material for a new generation of power batteries due to its low lithium intercalation voltage, high lithium intercalation capacity, and environmental friendliness. However, tin dioxide, as an anode material, suffers from severe volume expansion during charge and discharge, which leads to electrode crushing, conductive network collapse, and capacity decline, which limits its commercial application. Titanium dioxide is widely used in lithium-ion batteries, solar cells, photocatalysis, gas sensors and many other fields. Titanium dioxide nanomaterials, as anode materials for lithium-ion batteries, have the characteristics of high theoretical s...

AI Technical Summary

Problems solved by technology

[0003] The existing preparation methods of tin dioxide / titanium dioxide and graphene composites are usually to obtain graphene oxide through chemical oxidation, then exfoliate graphene at high temperature, and mix it with tin source and titanium source after ultrasonic dispersion , to obtain the compound, the main disadvantages of this method are: 1. the concentrated nitric acid, concentrated hydrochloric acid, and concentrated perchloric acid used are highly corrosive and volatile, and are likely to cause environmental pollution; 2. the process is more complicated and practically Difficult, high energy consumption, high production cost, not easy to popularize and use

; 3. the tin dioxide and titanium dioxide obtained by the method are independent particles without coating, that is, titanium dioxide does not limit the volume expansion of tin dioxide; 4. tin dioxide and titanium dioxide in the resulting product It is dispersed on the graphene matrix, there is only surface contact between them, there is no interaction force, the poor conductivity of titanium dioxide and the volume expansion of tin dioxide have not been fundamentally resolved

Images