A Novel Regulation Strategy of Solid Electrolyte Interphase Based on Anion-Solvent Coordination for Magnesium Metal Anode

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Kun TangGuanglei Cui

Abstract

Magnesium (Mg) metal anode is a highly desirable candidate among various high energy density metal anodes, possessing higher volumetric capacity and better safety characteristic compared to lithium metal. However, most Mg salts in conventional Mg electrolytes easily react with Mg metal to form blocking layers, leading to inferior reversibility of Mg plating/stripping. Here, a stable Mg2+ -conducting solid electrolyte interphase (SEI) is successfully constructed on Mg metal anode by regulating the molecular-orbital-energy-level toward an aluminum(III)-centered anion Mg salt through anion-solvent coordination. Of which, the LUMO energy level of perfluorinated pinacolatoaluminate (Al(O2 C2 (CF3 )4 )2- , abbreviated as FPA) anion has been adjusted by coordinating with solvent molecule (tetrahydrofuran) for facilitating the formation of advantageous SEI. The existence of SEI formed by FPA anion greatly improves the reversibility and long-term stability of Mg plating/stripping process. More importantly, based on this aluminum(III)-centered Mg electrolyte, the Mo6 S8 /Mg batteries can achieve a fantastic cycle performance of 9000 cycles, proving the beneficial effect of SEI on the cycling stability of Mg battery system. These findings...Continue Reading

References

Jan 27, 2010·Journal of the American Chemical Society·Nobuyoshi NomuraMitsunori Mizuno
Sep 24, 2014·Beilstein Journal of Nanotechnology·Rana Mohtadi, Fuminori Mizuno
May 28, 2015·Angewandte Chemie·Oscar TutusausYulia V Sevryugina
Mar 9, 2017·Chemical Reviews·Pieremanuele CanepaGerbrand Ceder
Jul 29, 2017·Chemical Reviews·Xin-Bing ChengQiang Zhang
Dec 1, 2017·Journal of the American Chemical Society·Liumin SuoChunsheng Wang
Jul 31, 2018·Journal of the American Chemical Society·Nathan T HahnKevin R Zavadil

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