Wu Weixin, Wang Jianbiao, Deng Qixin, Luo Haiyan, Li Yafeng, Wei Mingdeng
Fujian Key Laboratory of Electrochemical Energy Storage Materials, Fuzhou University, Fuzhou 350002, Fujian, China.
Technical Center of Fujian Tobacco Industrial Corporation Xiamen, Fujian 361022, China.
J Colloid Interface Sci. 2021 Nov;601:411-417. doi: 10.1016/j.jcis.2021.05.146. Epub 2021 May 26.
A low crystalline 1T-MoS@S-doped carbon (MoS@SC) composite was successfully synthesized via a facile hydrothermal process. The composite is comprised by few-layer 1T-MoS nanosheets covered by an amorphous carbon layer with an expanded interlayer d-spacing of 1.01 nm. This structure is conducive to the fast transport of lithium-ions and volume accommodation during the charge-discharge process when the composite is applied as an anode material for LIBs. Additionally, the high conductivity and layered structure of 1T-MoS also facilitate fast of ion/electron transport, contributing to the improvement of the electrochemical properties. Therefore, this material demonstrated a high rate performance and excellent cycling stability, with the capacities of 847 and 622 mA h g achieved at the current densities of 0.2 A g and 2 A g, respectively. Even at a larger current density of 2 A g, MoS@SC delivered a high reversible capacity of 659 mA h g with an average capacity loss of 0.006% per cycle after 500 cycles.
通过简便的水热法成功合成了一种低结晶度的1T-MoS@S掺杂碳（MoS@SC）复合材料。该复合材料由几层1T-MoS纳米片组成，表面覆盖有无定形碳层，层间d间距扩大至1.01 nm。当该复合材料用作锂离子电池的负极材料时，这种结构有利于在充放电过程中锂离子的快速传输和体积容纳。此外，1T-MoS的高导电性和层状结构也有助于离子/电子的快速传输，从而改善电化学性能。因此，这种材料表现出高倍率性能和优异的循环稳定性，在0.2 A g和2 A g的电流密度下，容量分别达到847和622 mA h g。即使在2 A g的更大电流密度下，MoS@SC仍具有659 mA h g的高可逆容量，在500次循环后平均每次循环的容量损失为0.006%。
