A kind of preparation method and application of titanium dioxide coated ferric oxide composite material

Abstract

The invention relates to a preparation method and application of a titanium dioxide coated ferric oxide composite material. The method comprises the following steps: synthesizing ferric oxide microspheres by using a hydrothermal method, and then separately coating the ferric oxide microspheres with a layer of amorphous titanium dioxide by a kinetic controlled water bath method; after that, carrying out heat treatment in an air atmosphere so as to obtain the crystal type titanium dioxide coated ferric oxide composite lithium ion battery anode material having a core-shell structure. The titaniumdioxide coated ferric oxide composite anode material prepared by the method effectively combines the high specific capacity of ferric oxide and the excellent cycle stability of titanium dioxide, thereby showing a higher specific capacity and stable cycle performance, and being an ideal lithium ion battery anode material; the material can be widely applied to lithium ion power batteries which require high energy density, long service life and high stability. Furthermore, the method provided by the invention is simple, mild in the conditions and lower in cost; the material has easily controlledmorphology structure and is suitable for mass production, thus having a good application prospect.

Description

technical field [0001] The invention belongs to the field of new energy materials for lithium-ion batteries, and in particular relates to a preparation method and application of a titanium dioxide-coated ferric oxide composite material. Background technique [0002] As a new, green, high-energy chemical power source, lithium-ion batteries are widely used in portable electronic devices, electric vehicles, aerospace and other fields. With the development of society, people put forward higher requirements on the performance of lithium-ion batteries. As an important component of lithium-ion batteries, negative electrode materials play an important role in the overall performance of the battery. At present, the specific capacity of graphite-based anode materials used in commercial lithium-ion batteries is usually less than 350 mAh g -1 , this low specific capacity is difficult to meet the actual development needs. In addition, the lithium intercalation potential of this graphi...

AI Technical Summary

Problems solved by technology

However, the electron transport of Fe2O3 materials is relatively slow, resulting in poor rate performance

At the same time, the ferric oxide material will undergo a large volume change during the charge and discharge process, resulting in the collapse of the material structure and rapid capacity decay.

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