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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
Unveiling the relationship between the multilayer structure of metallic MoS2 and the cycling performance for lithium
Zhipeng Liu1, Kaiwen Wang1, Guoqing Huang1
1Key Laboratory of Automobile Materials (Ministry of Education), School of Materials Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China. lin@jlu.edu.cn.
Abstract:
Molybdenum disulfide (MoS2) with a layered structure is a desirable substitute for the graphite anode in lithium ion storage. Compared with the semiconducting phase (2H-MoS2), the metallic polymorph (1T-MoS2) usually shows much better cycling stability. Nevertheless, the origin of this remarkable cycling stability is still ambiguous, hindering further development of MoS2-based anodes. Herein, we assembled multilayered 1T-MoS2 nanosheets directly on Ti foil to investigate the Li+ storage mechanism. Based on experimental observation and computational simulation, we found that the cycling stability correlates with the layer number of MoS2. Multilayered 1T-MoS2 can accommodate inserted Li+ in a ternary compound Li-Mo-S through a reversible reaction, which is favorable for retaining a substantial number of MoS2 nanodomains upon Li intercalation. These residual MoS2 nanodomains can serve as an anchor to adhere LiS species, thereby suppressing the "shuttle effect" of polysulfides and enhancing cycling stability. This work sheds light on the development of high-performance anodes based on metallic MoS2 for LIBs.
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