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Description:

Herein, we adopted surface engineering to address this issue by alleviating the passivation characteristics of reductive Mg electrodes. Among a series of artificial interfaces derived from different elements, the Mg–Zn–Cl-integrated artificial interface imparted outstanding Mg deposition–dissolution cycling performance upon combination with a halide-free weakly coordinated anion-based electrolyte. The artificial interface allowed Mg deposition–dissolution reactions beneath the interface, and such interfacial characteristics suppressed the intrusion of Mg deposits into microporous separators, leading to remarkably stable cycling even under exceptionally high utilization conditions (>30 %). The amorphous nature induced by Cl integration improved interfacial stability during the successive morphological changes of Mg electrodes owing to electrochemical deposition–dissolution cycling. In addition, the artificial interface enabled the employment of a thin PTFE-based separator, which was unattainable using unmodified Mg. The developed techniques can pave the way for assessing the interfacial behavior under harsh, lean electrolyte conditions, which is an extremely important but unexplored research area of RMB chemistry.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: Magnesium electrode, Interface, Surface modification, Short-circuit, Separator

Date published: 2024-02-26

Publisher: Elsevier BV

Journal:

• Energy Storage Materials (ISSN: 24058297) vol. 67 103302

Funding:

• Japan Society for the Promotion of Science JP21K05263 (リチウムおよびナトリウム系電解質の電気化学安定性を支配する制御因子の究明)
• Japan Science and Technology Agency JPMJPF2016 (先進蓄電池研究開発拠点)

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1016/j.ensm.2024.103302

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Updated at: 2024-03-05 16:30:24 +0900

Published on MDR: 2024-03-05 16:30:24 +0900