High Utilization of Composite Magnesium Metal Anodes Enabled by a Magnesiophilic Coating

High Utilization of Composite Magnesium Metal Anodes Enabled by a Magnesiophilic Coating

Nano Letters

10.1021/acs.nanolett.2c02829

http://dx.doi.org/10.1021/acs.nanolett.2c02829

Yuanjian Li, Gaoliang Yang, Shengnan Sun, Chang Zhang, Carina Yi Jing Lim, Andrew Jun Yao Wong, Wei Ying Lieu, Zdenek Sofer, Man-Fai Ng, Wei Liu, Zhi Wei Seh

Mechanical Engineering, General Materials Science, General Chemistry, Condensed Matter Physics, Bioengineering

10 August 2022

Li, Y., Yang, G., Sun, S., Zhang, C., Lim, C. Y. J., Wong, A. J. Y., Lieu, W. Y., Sofer, Z., Ng, M.-F., Liu, W., & Seh, Z. W. (2022). High Utilization of Composite Magnesium Metal Anodes Enabled by a Magnesiophilic Coating. Nano Letters, 22(16), 6808–6815. https://doi.org/10.1021/acs.nanolett.2c02829

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.

Publisher Copyright

This research / project is supported by the National Research Foundation - NRF Fellowship
Grant Reference no. : NRF-NRFF2017-04

This research is supported by core funding from: SERC
Grant Reference no. : NA

This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.nanolett.2c02829

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