AUTHOR=Ota Takaaki , Uchiyama Shota , Tsukada Keiichi , Moriya Makoto 

TITLE=Room-Temperature Mg-Ion Conduction Through Molecular Crystal Mg{N(SO2CF3)2}2(CH3OC5H9)2

JOURNAL=Frontiers in Energy Research

VOLUME=9

YEAR=2021

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2021.640777

DOI=10.3389/fenrg.2021.640777

ISSN=2296-598X

ABSTRACT=<p>Molecular crystals have attracted increasing attention as a candidate for innovative solid electrolytes with solid-state Mg-ion conductivity. In this work, we synthesized a novel Mg-ion-conducting molecular crystal, Mg{N(SO<sub>2</sub>CF<sub>3</sub>)<sub>2</sub>}<sub>2</sub>(CH<sub>3</sub>OC<sub>5</sub>H<sub>9</sub>)<sub>2</sub> (Mg(TFSA)<sub>2</sub>(CPME)<sub>2</sub>), composed of Mg bis(trifluoromethanesulfonyl)amide (Mg(TFSA)<sub>2</sub>) and cyclopentyl methyl ether (CPME) and elucidated its crystal structure. We found that the obtained Mg(TFSA)<sub>2</sub>(CPME)<sub>2</sub> exhibits solid-state ionic conductivity at room temperature and a high Mg-ion transference number of 0.74. Contrastingly, most Mg-conductive inorganic solid electrolytes require heating above 150–300°C to exhibit ionic conductivity. These results further prove the suitability of molecular crystals as candidates for Mg-ion-conducting solid electrolytes.</p>