Self-templated formation of tremella-like MoS2 with expanded spacing of (002) crystal planes for Li-ion batteries

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• 作者：Guoxin Qu ; Jianli Cheng ; Zhiyu Wang ; Bin Wang ; Shiyong Ye
• 刊名：Journal of Materials Science
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：51
• 期：10
• 页码：4739-4747
• 全文大小：2,430 KB
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• 作者单位：Guoxin Qu (1) (2)
  Jianli Cheng (2)
  Zhiyu Wang (2)
  Bin Wang (2)
  Shiyong Ye (1)
  
  1. College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, China
  2. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, 621900, Sichuan, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Characterization and Evaluation Materials
  Polymer Sciences
  Continuum Mechanics and Mechanics of Materials
  Crystallography
  Mechanics
  
• 出版者：Springer Netherlands
• ISSN：1573-4803

文摘

Tremella-like MoS₂ consisting of ultrathin nanosheets (~7 nm in thickness) is prepared via a one-pot hydrothermal reaction without using any surfactants and templates. The reaction involves transforming precursor MoO₃ to polyhedral intermediate (K₂NaMoO₃F₃ and K₃Mo₂O₄F₅) through its reaction with Na+, K+, and F− ions in the initial stage of hydrothermal reaction. Then the polyhedral intermediate acting as the sacrifice template reacts with the S2− released from a hydrolysis process of SCN− ion and transforms to tremella-like MoS₂. The obtained MoS₂ product exhibits expended spacing of the (002) crystal plane, which can facilitate faster lithium ions intercalation behavior. This tremella-like MoS₂ used as an anode material for lithium-ion batteries shows a very high reversible capacity of 693 mA h g−1 after 50 cycles, good rate capability, and high cyclic capacity retention. Even cycled at a high current density of 4800 mA g−1, the tremella-like MoS₂ still can deliver a high capacity of 252 mA h g−1. The secondary hierarchical microstructures consisting of ultrathin nanosheets are beneficial to greatly improved electrochemical performance of the MoS₂ electrode.