期刊
NANO LETTERS
卷 22, 期 16, 页码 6808-6815出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c02829
关键词
Magnesium metal anodes; Magnesiophilic coating; High utilization; High reversibility; Magnesium batteries
类别
资金
- Singapore National Research Foundation [NRF-NRFF2017-04]
- Agency for Science, Technology and Research (Central Research Fund Award)
- Czech Science Foundation (GACR) [20-16124J]
- A * STAR Computational Resource center
This article reports a novel composite design for metallic magnesium anode material, achieving high capacity utilization of 75% by coating magnesiophilic gold nanoparticles on copper foils, and exhibiting high Coulombic efficiency during cycling. Moreover, the full cell based on this anode material shows superior capacity retention at a low negative/positive ratio.
Metallic magnesium is a promising high-capacity anode material for energy storage technologies beyond lithium-ion batteries. However, most reported Mg metal anodes are only cyclable under shallow cycling (<= 1 mAh cm(-2)) and thus poor Mg utilization (< 3%) conditions, significantly compromising their energy-dense characteristic. Herein, composite Mg metal anodes with high capacity utilization of 75% are achieved by coating magnesiophilic gold nanoparticles on copper foils for the first time. Benefiting from homogeneous ionic flux and uniform deposition morphology, the Mg-plated Au-Cu electrode exhibits high average Coulombic efficiency of 99.16% over 170 h cycling at 75% Mg utilization. Moreover, the full cell based on Mg-plated Au-Cu anode and Mo6S8 cathode achieves superior capacity retention of 80% after 300 cycles at a low negative/positive ratio of 1.33. This work provides a simple yet effective general strategy to enhance Mg utilization and reversibility, which can be extended to other metal anodes as well.
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