Journal
NANO LETTERS
Volume 22, Issue 22, Pages 9138-9146Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c03710
Keywords
Magnesium metal anodes; electrolyte additives; in situ formed magnesiophilic sites; uniform Mg deposition; rechargeable magnesium batteries
Categories
Funding
- Agency for Science, Technology and Research (Central Research Fund Award)
- Czech Science Foundation (GACR) [20-16124J]
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For the first time, this study introduces a facile approach to build magnesiophilic In/MgIn sites on a Mg metal surface using InCl3 electrolyte additive for rechargeable Mg batteries. These magnesiophilic sites regulate Mg deposition behaviors, achieving stable performance and long cycling lifespan.
Owing to its high volumetric capacity and natural abundance, magnesium (Mg) metal has attracted tremendous attention as an ideal anode material for rechargeable Mg batteries. Despite Mg deposition playing an integral role in determining the cycling lifespan, its exact behavior is not clearly understood yet. Herein, for the first time, we introduce a facile approach to build magnesiophilic In/MgIn sites in situ on a Mg metal surface using InCl3 electrolyte additive for rechargeable Mg batteries. These magnesiophilic sites can regulate Mg deposition behaviors by homogenizing the distributions of Mg-ion flux and electric field at the electrode-electrolyte interphase, allowing flat and compact Mg deposition to inhibit short-circuiting. The as-designed Mg metal batteries achieve a stable cycling lifespan of 340 h at 1.0 mA cm-2 and 1.0 mAh cm-2 using Celgard separators, while the full cell coupled with Mo6S8 cathode maintains a high capacity retention of 95.5% over 800 cycles at 1 C.
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