Reversible Magnesium Metal Anode Enabled by Cooperative Solvation/Surface Engineering in Carbonate Electrolytes

Caiyun Wang, Yao Huang, Yunhao Lu, Hongge Pan, Ben Bin Xu, Wenping Sun, Mi Yan, Yinzhu Jiang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Magnesium metal anode holds great potentials towards future high energy and safe rechargeable magnesium battery technology due to its divalent redox and dendrite-free nature. Electrolytes based on Lewis acid chemistry enable the reversible Mg plating/stripping, while they fail to match most cathode materials toward high voltage magnesium batteries. Herein, reversible Mg plating/stripping is achieved in conventional carbonate electrolytes enabled by the cooperative solvation/surface engineering. Strongly electronegative Cl from the MgCl2 additive of electrolyte impairs the Mg...O=C interaction to reduce the Mg2+ desolvation barrier for accelerated redox kinetics, while the Mg2+-conducting polymer coating on the Mg surface ensures the facile Mg2+ migration and the effective isolation of electrolytes. As a result, reversible plating and stripping of Mg is demonstrated with a low overpotential of 0.7 V up to 2000 cycles. Moreover, benefitting from the wide electrochemical window of carbonate electrolytes, high voltage (>2.0 V) rechargeable magnesium batteries are achieved through assembling the electrode couple of Mg metal anode and Prussian blue-based cathodes. The present work provides a cooperative engineering strategy to promote the application of magnesium anode in carbonate electrolytes toward high energy rechargeable batteries.
Original languageEnglish
Article number195
Pages (from-to)1-11
Number of pages11
JournalNano-Micro Letters
Volume13
Issue number1
Early online date14 Sep 2021
DOIs
Publication statusE-pub ahead of print - 14 Sep 2021

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