Volume 62, Issue 21 e202301934
Research Article

Revealing the Interfacial Chemistry of Fluoride Alkyl Magnesium Salts in Magnesium Metal Batteries

Juncai Long

Juncai Long

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070 China

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Dr. Shuangshuang Tan

Dr. Shuangshuang Tan

College of Materials Science and Engineering, Chongqing University, Chongqing, 400030 China

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Junjun Wang

Junjun Wang

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070 China

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Dr. Fangyu Xiong

Dr. Fangyu Xiong

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070 China

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Lianmeng Cui

Lianmeng Cui

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070 China

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Prof. Qinyou An

Corresponding Author

Prof. Qinyou An

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070 China

Wuhan University of Technology (Xiangyang Demonstration Zone), Xiangyang, 441000 China

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Prof. Liqiang Mai

Corresponding Author

Prof. Liqiang Mai

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070 China

Wuhan University of Technology (Xiangyang Demonstration Zone), Xiangyang, 441000 China

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First published: 22 March 2023
Citations: 22

Graphical Abstract

Fluoride alkyl magnesium salts reconstructing the solvation structure of Mg2+ not only improve the high voltage tolerance of the electrolyte, but also facilitate the in situ generation of a robust solid electrolyte interface enabling a steady Mg metal anode.

Abstract

Exploring promising electrolyte-system with high reversible Mg plating/stripping and excellent stability is essential for rechargeable magnesium batteries (RMBs). Fluoride alkyl magnesium salts (Mg(ORF)2) not only possess high solubility in ether solvents but also compatible with Mg metal anode, thus holding a vast application prospect. Herein, a series of diverse Mg(ORF)2 were synthesized, among them, perfluoro-tert-butanol magnesium (Mg(PFTB)2)/AlCl3/MgCl2 based electrolyte demonstrates highest oxidation stability, and promotes the in situ formation of robust solid electrolyte interface. Consequently, the fabricated symmetric cell sustains a long-term cycling over 2000 h, and the asymmetric cell exhibits a stable Coulombic efficiency of 99.5 % over 3000 cycles. Furthermore, the Mg||Mo6S8 full cell maintains a stable cycling over 500 cycles. This work presents guidance for understanding structure–property relationships and electrolyte applications of fluoride alkyl magnesium salts.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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