Abstract
A large overpotential is often reported for rechargeable magnesium batteries during the deposition/stripping of magnesium, which can be detrimental to the cell performance. In this work, a three-dimensional electrode that mainly composed magnesiophilic MoSe2 (MMSE) has been fabricated and proposed as the substrate for the electrochemical deposition/stripping of magnesium metal. The magnesiophilic interface of MoSe2 has been proven by electrochemical tests of magnesium deposition test. In addition, the electrochemical property of 3D MMSE has been examined by a large-capacity (10 mAh/cm2) magnesium deposition/stripping test. The stable magnesiophilic interface of MMSE has been further confirmed by SEM characterization. Finally, the crucial effect of the magnesiophilic interface of MMSE on the overpotentials have been demonstrated by Mg deposition/stripping test under various current densities.
Highlights
Strong interest in alternative energy storage systems has been caused due to the cost constraints and operational safety issues of lithium-ion batteries
The development of magnesium rechargeable battery is still limited by multiple obstacles, including the slow diffusion of highly polar divalent magnesium ions in the cathode material, the narrow voltage window of the electrolyte limiting the requirements of high energy density, the compatibility of the electrolyte with the magnesium metal anode, and the huge overpotential of both cathode and anode (Cheng et al, 2016; Canepa et al, 2017)
MoSe2 were synthesized through a hydrothermal method followed by high temperature sintering, with their morphology observed by transmission electron microscope (TEM) (Ge et al, 2018)
Summary
Strong interest in alternative energy storage systems has been caused due to the cost constraints and operational safety issues of lithium-ion batteries. The most fascinating feature of Mg metal anode is that there is no dendrite generation during the magnesium charge and discharge process, which eliminates the potential safety hazard of the battery short circuit caused by dendrite puncturing of the separator. The development of magnesium rechargeable battery is still limited by multiple obstacles, including the slow diffusion of highly polar divalent magnesium ions in the cathode material, the narrow voltage window of the electrolyte limiting the requirements of high energy density, the compatibility of the electrolyte with the magnesium metal anode, and the huge overpotential of both cathode and anode (Cheng et al, 2016; Canepa et al, 2017). There are few studies focusing on the reduction of Mg anode overpotential (Li et al, 2018; Tang et al, 2019)
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