Shi Mingchen, Wang Qiang, Hao Junwei, Min Huihua, You Hairui, Liu Xiaomin, Yang Hui
College of Materials Science and Engineering, Nanjing Tech University, Nanjing, Jiangsu, China.
Electron Microscope Lab, Nanjing Forestry University, Nanjing, Jiangsu, China.
Dalton Trans. 2020 Oct 20;49(40):14115-14122. doi: 10.1039/d0dt03070h.
Cobalt sulfide (Co4S3) is considered one of the most promising anode materials for lithium-ion batteries owing to its high specific capacity. However, some disadvantages, such as poor electrical conductivity and volume expansion, lead to low rate capability and may hinder its practical applications. Herein, we firstly fabricated leaf-like hollow Co4S3/C nanosheet arrays growing on carbon cloth (h-Co4S3/C NA@CC) by a facile solution method combined with carbonization, sulfidation and annealing treatments. The carbon coated leaf-like nanosheet structure can facilitate the electron transfer and shorten the ion transfer path, while the hollow space inside Co4S3 can buffer the volume variation. As the anode for LIBs, h-Co4S3/C NA@CC demonstrates an impressive rate capability (654.3 mA h g-1 at 1 A g-1 and 394.1 mA h g-1 at 2 A g-1), and an excellent cycling stability (720 mA h g-1 at 1 A g-1 after 200 cycles and 79% capacity retention at 2 A g-1 after 500 cycles).
硫化钴（Co4S3）因其高比容量而被认为是锂离子电池最有前景的负极材料之一。然而，一些缺点，如电导率差和体积膨胀，导致倍率性能较低，并可能阻碍其实际应用。在此，我们首先通过一种简便的溶液法结合碳化、硫化和退火处理，制备了生长在碳布上的叶状中空Co4S3/C纳米片阵列（h-Co4S3/C NA@CC）。碳包覆的叶状纳米片结构可以促进电子转移并缩短离子转移路径，而Co4S3内部的中空空间可以缓冲体积变化。作为锂离子电池的负极，h-Co4S3/C NA@CC表现出令人印象深刻的倍率性能（1 A g-1时为654.3 mA h g-1，2 A g-1时为394.1 mA h g-1），以及优异的循环稳定性（200次循环后1 A g-1时为720 mA h g-1，500次循环后2 A g-1时容量保持率为79%）。
