Ionic Liquid‐Incorporated Metal‐Organic Framework with High Magnesium Ion Conductivity for Quasi‐Solid‐State Magnesium Batteries. Issue 12 (26th October 2022)

• Record Type: Journal Article
• Authors: Wei, Zhixuan; Maile, Ruben; Riegger, Luise M.; Rohnke, Marcus; Müller‐Buschbaum, Klaus; Janek, Jürgen
• Is Part Of: Batteries & supercaps. Volume 5:Issue 12(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-26
• Subjects: interface -- ionic liquids -- ionogel electrolyte -- magnesium battery -- metal-organic frameworks; Electrochemistry -- Periodicals; Electrodes -- Periodicals; Electric batteries -- Periodicals; 621.31242
• DOI: 10.1002/batt.202200318
• Languages: English
• ISSNs: 2566-6223

Abstract

Abstract: Magnesium batteries are promising candidates for post‐lithium energy storage systems due to their low cost, high volumetric energy density, and low risk of dendrite formation. This study reports a new magnesium ion conducting ionogel electrolyte based on a Metal‐Organic Framework (MOF) structure (UiO‐66) impregnated with an ionic liquid, magnesium bis[(trifluoromethyl)sulfonyl]imide in 1‐ethyl‐3‐methylimidazolium bis[(trifluoromethyl)sulfonyl]imide. Comparably high conductivity of 5.7×10 −5 S cm −1 can be achieved at room temperature. By employing the prepared MOF‐ionogel electrolyte, a reversible quasi‐solid‐state magnesium battery (QSSMB) is reported. Surface analysis unveils the possible origin of the large overpotential of magnesium plating and stripping. The findings suggest that MOF‐based materials are a promising class of ionogel electrolyte templates for QSSMBs. The results on the magnesium anode will be useful to define optimization strategies for magnesium metal anodes in SSMBs. Abstract : A new ionogel electrolyte (IE) based on the incorporation of ionic liquid inside a metal‐organic framework is reported for magnesium ion conduction. The IE, with comparably high ionic conductivity, good chemical and electrochemical stability drives a quasi‐solid‐state magnesium battery to work. A fluorine and oxygen‐rich composite interphase is observed to form between Mg metal and the IE.