Liu Kangli, Zhang Xiangdan, Miao Fujun, Wang Zhuo, Zhang Shijie, Zhang Yongshang, Zhang Peng, Shao Guosheng
State Center for International Cooperation on Designer Low-Carbon and Environmental Materials (CDLCEM), School of Materials Science and Engineering, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, 450001, China.
Zhengzhou Materials Genome Institute (ZMGI), Building 2, Zhongyuanzhigu, Xingyang, Zhengzhou, 450100, China.
Small. 2021 May;17(20):e2100065. doi: 10.1002/smll.202100065. Epub 2021 Apr 1.
Accelerating the conversion of polysulfide to inhibit shutting effect is a promising approach to improve the performance of lithium-sulfur batteries. Herein, the hollow titanium nitride (TiN)/1T-MoS heterostructure nanospheres are designed with efficient electrocatalysis properties serving as a sulfur host, which is formed by in situ electrochemical intercalation from TiN/2H-MoS . Metallic, few-layered 1T-MoS nanosheets with abundant active sites decorated on TiN nanospheres enable fast electron transfer, high adsorption ability toward polysulfides, and favorable catalytic activity contributing to the conversion kinetics of polysulfides. Benefiting from the synergistic effects of these favorable features, the as-developed hollow TiN/1T-MoS nanospheres with advanced architecture design can achieve a high discharge capacity of 1273 mAh g at 0.1 C, good rate performance with a capacity retention of 689 mAh g at 2 C, and long cycling stability with a low-capacity fading rate of 0.051% per cycle at 1 C for 800 cycles. Notably, the TiN/1T-MoS /S cathode with a high sulfur loading of up to 7 mg cm can also deliver a high capacity of 875 mAh g for 50 cycles at 0.1 C. This work promotes the prospect application for TiN/1T-MoS in lithium-sulfur batteries.
加速多硫化物的转化以抑制关断效应是提高锂硫电池性能的一种有前景的方法。在此，设计了具有高效电催化性能的中空氮化钛（TiN）/1T-MoS异质结构纳米球作为硫宿主，它是通过从TiN/2H-MoS进行原位电化学插层形成的。在TiN纳米球上装饰有丰富活性位点的金属性、少层1T-MoS纳米片能够实现快速电子转移、对多硫化物的高吸附能力以及有助于多硫化物转化动力学的良好催化活性。受益于这些有利特性的协同效应，所开发的具有先进结构设计的中空TiN/1T-MoS纳米球在0.1C下可实现1273 mAh g的高放电容量，在2C下具有良好的倍率性能，容量保持率为689 mAh g，在1C下循环800次时具有低容量衰减率，每循环0.051% 的长循环稳定性。值得注意的是，硫负载高达7 mg cm的TiN/1T-MoS /S阴极在0.1C下50次循环也能提供875 mAh g的高容量。这项工作促进了TiN/1T-MoS在锂硫电池中的应用前景。
