Wang Hongying, Song Yanli, Zhao Yanming, Zhao Yan, Wang Zhifeng
School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300401, China.
Key Laboratory for New Type of Functional Materials in Hebei Province, Hebei University of Technology, Tianjin 300401, China.
Nanomaterials (Basel). 2022 Sep 7;12(18):3104. doi: 10.3390/nano12183104.
Rational design of sulfur hosts for lithium-sulfur (Li-S) batteries is essential to address the shuttle effect and accelerate reaction kinetics. Herein, the composites of bimetallic sulfide CuCoS loaded on carbon nanotubes (CNTs) are prepared by hydrothermal method. By regulating the loading of CuCoS nanoparticles, it is found that when Cu and CNT are prepared in a 10:1 ratio, the CuCoS nanoparticles loaded on the CNT are relatively uniformly distributed, avoiding the occurrence of agglomeration, which improves the electrical conductivity and number of active sites. Through a series of electrochemical performance tests, the S/CuCoS-1/CNT presents a discharge specific capacity of 1021 mAh g at 0.2 C after 100 cycles, showing good cycling stability. Even at 1 C, the S/CuCoS-1/CNT cathode delivers a discharge capacity of 627 mAh g after 500 cycles. This study offers a promising strategy for the design of bimetallic sulfide-based sulfur hosts in Li-S batteries.
合理设计锂硫（Li-S）电池的硫宿主对于解决穿梭效应和加速反应动力学至关重要。在此，通过水热法制备了负载在碳纳米管（CNT）上的双金属硫化物CuCoS复合材料。通过调节CuCoS纳米颗粒的负载量，发现当以10:1的比例制备Cu和CNT时，负载在CNT上的CuCoS纳米颗粒分布相对均匀，避免了团聚的发生，从而提高了电导率和活性位点数量。通过一系列电化学性能测试，S/CuCoS-1/CNT在0.2 C下100次循环后放电比容量为1021 mAh g，显示出良好的循环稳定性。即使在1 C下，S/CuCoS-1/CNT阴极在500次循环后仍能提供627 mAh g的放电容量。本研究为锂硫电池中基于双金属硫化物的硫宿主设计提供了一种有前景的策略。
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