A kind of ferroferric oxide/silicon oxide/multilayer graphene composite material and preparation method thereof

Abstract

The invention discloses a ferroferric oxide / silicon oxide / multilayer graphene composite material and a preparation method thereof. In the composite material, the multilayer graphene is a carbon base material obtained from expanded graphite through mechanical exfoliation, and the thickness is less than 10nm. flat surface. Ferroferric oxide and silicon oxide form a composite film on the surface of the multilayer graphene, and the ferroferric oxide and silicon oxide are isolated from each other in the composite film and distributed evenly, and the thickness of the film layer is less than 10nm. The specific preparation process of the ferroferric oxide / silicon oxide / multilayer graphene composite material is as follows: the expanded graphite is put into the mixed solution of DMF and water, and the multilayer graphene dispersion is obtained after mechanical peeling; anhydrous acetic acid is weighed Sodium, ferrous chloride and ethyl orthosilicate, add multi-layer graphene dispersion; put into water bath and stir, then warm up to 90°C in water bath for 15 minutes; take it out after a certain period of reaction, and centrifuge to clean The ferric oxide / silicon oxide / multilayer graphene composite material of the present invention is obtained. The preparation process of the invention is simple and suitable for industrialized production.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a ferric oxide / silicon oxide / multilayer graphene composite material and a preparation method thereof. The material of the invention has potential applications in the fields of catalysis, energy storage and the like, and can be used as a negative electrode material of a high-performance lithium ion battery. Background technique [0002] With the continuous development of portable electronic products, people have higher and higher requirements on the energy density, power density, service life and fast charging and discharging of energy storage devices. At present, the negative electrode materials in commercial lithium-ion batteries are mainly graphite materials (theoretical capacity is 372mAh / g), and transition metal oxides have been attracted by people because of their advantages such as high reversible capacity, low working voltage, abundant reserves, and no pollution to the env...

AI Technical Summary

Problems solved by technology

[0003] The theoretical capacity of ferroferric oxide is as high as (theoretical capacity 926mAh / g), but when ferric ferric oxide is charged and discharged, a huge volume expansion will occur, and after many cycles, the active material is easy to pulverize / fall off, resulting in Reduced cycle performance and rapid capacity decay

The nano-silica coating method is to prepare spherical silica particles first, and then coat metal oxides. The process is more complicated and not suitable for industrial production.

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