Cu4SnS4 composite nanoflower and preparation method and application thereof

By preparing Cu4SnS4-rich composite nanoflowers, the problems of large volume change and poor reversibility of conversion reaction of Cu2SnS3 nanoparticles during cycling were solved, and the synthesis of high-purity Cu4SnS4 was achieved, which improved the cycle stability and electrochemical performance of lithium batteries.

CN119774652BActive Publication Date: 2026-06-09XIAMEN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIAMEN UNIV
Filing Date
2024-12-30
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing Cu2SnS3 nanoparticles exhibit large volume changes and poor reversibility of conversion reactions during cycling, resulting in poor electrochemical performance. Furthermore, the synthesis of high-purity Cu4SnS4 is difficult, affecting the reversible capacity and cycle stability of the battery.

Method used

The method for preparing Cu4SnS4-rich composite nanoflowers involves dissolving copper salt, tin salt, and thiourea to form a gel, ultrasonically forming an emulsion, and performing hydrothermal reaction and heat treatment to obtain CTS materials with high Cu4SnS4 content and a small amount of Cu7.2S4 composite.

Benefits of technology

It effectively reduces the formation of other CTS phases, improves the reversibility of the conversion reaction, mitigates the impact of volume changes on battery performance, and significantly improves the cycle stability and electrochemical performance of lithium batteries.

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Abstract

This invention discloses a method for preparing Cu4SnS4-rich composite nanoflowers, comprising the following steps: 1) dissolving copper salt in an appropriate amount of ethanol to obtain a copper salt solution; 2) adding tin salt to the copper salt solution and stirring until completely dissolved; 3) dissolving thiourea in an appropriate amount of ethanol to obtain a thiourea solution; 4) mixing the solutions from step 2) and step 3) and stirring to form a gel; 5) sonicating and stirring the gel at a certain temperature to form a dispersed emulsion; 6) transferring the dispersed emulsion to a hydrothermal reactor for a solvothermal reaction; 7) centrifuging or filtering the reaction product and then drying it; 8) heat-treating the dried product in an inert atmosphere to obtain a high-content Cu4SnS4 composite nanoflower with a small amount of Cu. 7.2 The CTS material of S4. The CTS material prepared by this invention has significantly better long-cycle performance and capacity than existing Cu-Sn-S composite materials, and is suitable for further promotion and application.
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