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

Changhuan Zhang, Liran Zhang, Nianwu Li and Xiuqin Zhang
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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

Energies, 2020, vol. 13, issue 17, 1-10

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.

Keywords: Mg–Li hybrid batteries; magnesium batteries; FeSe 2; metal anode (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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