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Studies of FeSe 2 Cathode Materials for Mg–Li Hybrid Batteries

Author

Listed:
  • Changhuan Zhang

    (Beijing Key Laboratory of Clothing Materials R & D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, Beijing Institute of Fashion Technology, Beijing 100029, China)

  • Liran Zhang

    (Beijing Key Laboratory of Clothing Materials R & D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, Beijing Institute of Fashion Technology, Beijing 100029, China)

  • Nianwu Li

    (State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China)

  • Xiuqin Zhang

    (Beijing Key Laboratory of Clothing Materials R & D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, Beijing Institute of Fashion Technology, Beijing 100029, China)

Abstract

Rechargeable magnesium (Mg)-based energy storage has attracted extensive attention in electrochemical storage systems with high theoretical energy densities. The Mg metal is earth-abundant and dendrite-free for the anode. However, there is a strong Coulombic interaction between Mg 2+ and host materials that often inhibits solid-state diffusion, resulting in a large polarization and poor electrochemical performances. Herein, we develop a Mg–Li hybrid battery using a Mg-metal anode, an FeSe 2 powder with uniform size and a morphology utilizing a simple solution-phase method as the counter electrode and all-phenyl-complex/tetrahydrofuran (APC)-LiCl dual-ion electrolyte. In the Li + -containing electrolyte, at a current density of 15 mA g −1 , the Mg–Li hybrid battery (MLIB) delivered a satisfying initial discharge capacity of 525 mAh g −1 . Moreover, the capacity was absent in the FeSe 2 |APC|Mg cell. The working mechanism proposed is the “Li+-only intercalation” at the FeSe 2 and the “Mg 2+ dissolved or deposited” at the Mg foil in the FeSe 2 |Mg 2+ /Li + |Mg cell. Furthermore, ex situ XRD was used to investigate the structural evolution in different charging and discharging states.

Suggested Citation

  • Changhuan Zhang & Liran Zhang & Nianwu Li & Xiuqin Zhang, 2020. "Studies of FeSe 2 Cathode Materials for Mg–Li Hybrid Batteries," Energies, MDPI, vol. 13(17), pages 1-10, August.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:17:p:4375-:d:403545
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    References listed on IDEAS

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    1. D. Aurbach & Z. Lu & A. Schechter & Y. Gofer & H. Gizbar & R. Turgeman & Y. Cohen & M. Moshkovich & E. Levi, 2000. "Prototype systems for rechargeable magnesium batteries," Nature, Nature, vol. 407(6805), pages 724-727, October.
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