Abstract The combination of multiple active components and engineering of reasonable structures are effective strategies to prepare high-performance electrochemical electrodes. Herein, a specially designed Bi2S3–CoS@C core-shell structure is synthesized using ZIF-67 as a template, in which nanoparticles of Bi2S3 and CoS in the composites are surrounded by a carbon layer with a sufficient amount of hollow space. This structure is conducive to the transport of ions, an increase in the conductivity and accommodating the volume change of the active materials during cycling. When applied as an anode for lithium-ion batteries, the Bi2S3–CoS@C electrode exhibits excellent electrochemical properties, displaying an excellent specific capacity of 1390 mAh g−1 at a current density of 100 mA g−1 after 100 cycles. During a long cycling test, an excellent reversible capacity of 836.2 mAh g−1 can also be obtained at a high current density of 1 A g−1 after 300 cycles. This work sheds light on an efficient approach to build novel high-performance electrodes for energy devices.

中文翻译：

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源自 ZIF-67 的 Bi2S3–CoS@C 核壳结构作为高性能锂离子电池的负极

摘要 多种活性成分的组合和合理结构的工程化是制备高性能电化学电极的有效策略。在此，以 ZIF-67 为模板合成了一种特殊设计的 Bi2S3–CoS@C 核壳结构，其中复合材料中的 Bi2S3 和 CoS 纳米颗粒被具有足够中空空间的碳层包围。这种结构有利于离子的传输，增加电导率并适应循环过程中活性材料的体积变化。当用作锂离子电池的负极时，Bi2S3-CoS@C 电极表现出优异的电化学性能，在 100 次循环后在 100 mA g-1 的电流密度下显示出 1390 mAh g-1 的优异比容量。在长时间的骑行测试中，在 1 A g-1 的高电流密度下，300 次循环后也可以获得 836.2 mAh g-1 的优异可逆容量。这项工作揭示了一种为能源设备构建新型高性能电极的有效方法。