J. Mater. Sci. Technol. ›› 2023, Vol. 155: 47-53.DOI: 10.1016/j.jmst.2023.01.028

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Ion diffusion, and hysteresis of magnesium hydride conversion electrode materials

Yingtong Lva,1, Xiang Zhanga,1, Wei Chenb, Shunlong Jub, Zhenhua Liua, Guanglin Xiab, Takayuki Ichikawac, Tengfei Zhanga,*, Xuebin Yub,*   

  1. aCentre for Hydrogenergy, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
    bDepartment of Materials Science, Fudan University, Shanghai 200433, China;
    cGraduate School of Engineering, Hiroshima University, 739-8530 Higashi, Hiroshima, Japan
  • Received:2022-11-21 Revised:2022-12-30 Accepted:2023-01-11 Published:2023-08-20 Online:2023-03-14
  • Contact: *E-mail addresses: zhangtengfei@nuaa.edu.cn (T. Zhang), yuxuebin@fudan.edu.cn (X. Yu).
  • About author:1These authors contributed equally to this work.

Abstract: MgH2, owing to a high theoretical capacity of 2038 mAh g-1, is regarded as a promising anode material for lithium-ion batteries (LIBs). However, the application of MgH2 is still far from satisfactory due to its poor cycling stability. Herein, nano-crystallization of MgH2 as an anode is applied for all-solid-state lithium-ion batteries (ASSLIBs) using LiBH4 as a solid-state electrolyte. The self-assembly designed MgH2 electrode on graphene could effectively alleviate the volume expansion, prevent the agglomeration of active substances, improve the electron transfer, and enhance the electrochemical performance of the anode material. As a result, a reversible capacity of 1214 mAh g-1 after 50 cycles is obtained. Significantly enhanced cycle life with a notable capacity of 597 mAh g-1 at a current density of 400 mA g-1 is delivered after 200 cycles. Further investigation on full cells also exhibits great application potential on ASSLIBs.

Key words: Magnesium hydride, Lithium borohydrides, Graphene, Nano-crystallization, All-solid-state lithium-ion battery