Nano-Micro Letters (Jul 2021)

Electrochemical Lithium Storage Performance of Molten Salt Derived V2SnC MAX Phase

  • Youbing Li,
  • Guoliang Ma,
  • Hui Shao,
  • Peng Xiao,
  • Jun Lu,
  • Jin Xu,
  • Jinrong Hou,
  • Ke Chen,
  • Xiao Zhang,
  • Mian Li,
  • Per O. Å. Persson,
  • Lars Hultman,
  • Per Eklund,
  • Shiyu Du,
  • Zhifang Chai,
  • Zhengren Huang,
  • Na Jin,
  • Jiwei Ma,
  • Ying Liu,
  • Zifeng Lin,
  • Qing Huang

Journal volume & issue
Vol. 13, no. 1
pp. 1 – 10


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Abstract MAX phases are gaining attention as precursors of two-dimensional MXenes that are intensively pursued in applications for electrochemical energy storage. Here, we report the preparation of V2SnC MAX phase by the molten salt method. V2SnC is investigated as a lithium storage anode, showing a high gravimetric capacity of 490 mAh g−1 and volumetric capacity of 570 mAh cm−3 as well as superior rate performance of 95 mAh g−1 (110 mAh cm−3) at 50 C, surpassing the ever-reported performance of MAX phase anodes. Supported by operando X-ray diffraction and density functional theory, a charge storage mechanism with dual redox reaction is proposed with a Sn–Li (de)alloying reaction that occurs at the edge sites of V2SnC particles where Sn atoms are exposed to the electrolyte followed by a redox reaction that occurs at V2C layers with Li. This study offers promise of using MAX phases with M-site and A-site elements that are redox active as high-rate lithium storage materials.