Li Yuanjian, Yang Gaoliang, Sun Shengnan, Zhang Chang, Lim Carina Yi Jing, Wong Andrew Jun Yao, Lieu Wei Ying, Sofer Zdenek, Ng Man-Fai, Liu Wei, Seh Zhi Wei
Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, Singapore 138634, Singapore.
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
Nano Lett. 2022 Aug 24;22(16):6808-6815. doi: 10.1021/acs.nanolett.2c02829. Epub 2022 Aug 10.
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) 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 MoS 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.
金属镁是一种很有前景的高容量负极材料，可用于锂离子电池以外的储能技术。然而，大多数报道的镁金属负极仅在浅循环（≤1 mAh cm）以及较差的镁利用率（<3%）条件下可循环，这严重损害了它们的能量密度特性。在此，首次通过在铜箔上涂覆亲镁金纳米颗粒，实现了镁利用率高达75%的复合镁金属负极。得益于均匀的离子通量和均匀的沉积形态，镀镁的金 - 铜电极在75%镁利用率下循环170小时，平均库仑效率高达99.16%。此外，基于镀镁的金 - 铜负极和MoS正极的全电池在低负/正比率为1.33的情况下，经过300次循环后实现了80%的优异容量保持率。这项工作提供了一种简单而有效的通用策略来提高镁的利用率和可逆性，该策略也可扩展到其他金属负极。
