Geometrical design of top-to-bottom magnesiophilicity-gradient host for reversible Mg-metal batteries

Jin Hwan Kwak, Seowan Park, Sunghee Shin, Seojeong Park, Chanmi Kang, Seung Ho Yu, Janghyuk Moon, Hee Dae Lim

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Magnesium-metal batteries (MMBs) are promising candidates for large-scale energy-storage systems owing to their high volumetric capacity, low cost, and high level of safety. However, the problems of dendritic Mg deposition and its poor adhesion to a substrate remain unresolved. Herein, we first propose a unique geometrical design of a top-to-bottom magnesiophilicity-gradient 3D host for reversible MMBs. By systematically stacking three mesh layers with different Mg affinities, the 3D-Mg affinity controlled architecture (3D-MACA) can be simply fabricated. The bottom layer was designed to contain numerous nanofibers decorated with magnesiophilic Au seeds, which effectively guided the bottom-oriented Mg nucleation. In addition, the electrically insulated top layer could minimize the undesirable top-plating of Mg. As a result, 3D-MACA showed the lowest nucleation overpotential and highest cycle retention among the potential candidates. For evidence of bottom-oriented growth, ex-situ observation analysis of 3D-MACA was performed, and the geometrical effect was further investigated and explained by the theoretical 3D simulation. The proposed strategy may provide insight for future studies aimed at solving the prevailing issues for MMBs; in addition, the unique design can be extended to other metal battery systems.

Original languageEnglish
Article number102762
JournalEnergy Storage Materials
Volume59
DOIs
Publication statusPublished - 2023 May

Bibliographical note

Publisher Copyright:
© 2023

Keywords

  • Dendrite
  • Magnesiophilic seeds
  • Magnesium
  • Magnesium metal battery

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science
  • Energy Engineering and Power Technology

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