A tin cobalt selenide@C heterostructure composite material, a preparation method thereof, and an application thereof

By preparing tin cobalt selenide@C heterostructure composite material, the volume change problem of sodium ion battery anode material during sodium ion embedding and removal process is solved, the rate performance and cycle stability of the battery are improved, and the preparation process is simplified.

CN115172708BActive Publication Date: 2025-07-25PINGYU ZHONGXING ENERGY CO LTD
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Patent Information

Application Number
CN202210882313.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-07-26
Publication Date
2025-07-25
Estimated Expiration
2042-07-26

AI Technical Summary

Technical Problem

The existing sodium ion battery negative electrode materials have large volume changes during the sodium ion embedding and removal process, poor structural stability, electrochemical performance needs to be improved, and the preparation process is cumbersome and has safety hazards.

Method used

The precursor SnCo(OH)6 is prepared by co-precipitation method, and a carbon layer is coated thereon, and then selenization and carbonization reactions are carried out to form a tin cobalt selenide@C heterostructure composite material with a core-shell box structure to alleviate the volume expansion problem.

Benefits of technology

It improves the rate performance and cycle stability of sodium ion batteries, simplifies the preparation process, has a wide range of materials and high safety.

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Abstract

The present invention discloses a tin cobalt selenide @C heterostructure composite material, a preparation method thereof and an application, comprising the following steps: A. preparing a precursor SnCo(OH)6 by a coprecipitation method; B. coating a carbon layer on the precursor SnCo(OH)6 to obtain a composite material; C. performing a selenization reaction on the above composite material to obtain a selenized composite material; D. performing a carbonization reaction on the selenized composite material to obtain a tin cobalt selenide @C heterostructure composite material. Compared with the single structure of traditional anode materials for sodium-ion batteries, the present invention enhances the adsorption of sodium ions by the material by introducing a heterostructure, thereby improving the rate performance of the sodium-ion battery. At the same time, the box-type buffer structure can effectively maintain the volume change of the material during long-term cycling, improving the cycle stability of the sodium-ion battery.
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