Operando Visualization of Morphological Evolution in Mg Metal Anode: Insight into Dendrite Suppression for Stable Mg Metal Batteries

Jin Hwan Kwak, Yunseo Jeoun, Si Hyoung Oh, Seungho Yu, Jae Hong Lim, Yung Eun Sung, Seung Ho Yu, Hee Dae Lim

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Rechargeable Mg-metal batteries (RMBs) are considered promising alternatives to conventional Li-ion batteries owing to their high volumetric capacity and low cost. In addition, Mg anodes for RMBs do not suffer from metal dendritic growth or internal short circuit. However, the notion that Mg anodes are indeed dendrite-free has recently been under debate, and further clarification is crucial for advancing practical RMBs. In this work, we closely investigated Mg dendrite behaviors under various electrochemical test conditions using operando observation techniques. The critical current density inducing fatal Mg dendritic growth was defined by directly monitoring the dendritic growth process leading to a short circuit. We further propose a new strategy to regulate the dendrite growth by introducing magnesiophilic sites of Au nanoseeds on a substrate. We not only elucidated the effect of the applied current density and capacity utilization on the Mg growth behaviors but also demonstrated the effect of magnesiophilic seeds in suppressing Mg dendrite growth.

Original languageEnglish
Pages (from-to)162-170
Number of pages9
JournalACS Energy Letters
Volume7
Issue number1
DOIs
Publication statusPublished - 2022 Jan 14
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

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