Influence of Gel Electrolytes Containing OMgCl-functionalized Inorganic Nanofibers on Magnesium Plating/Stripping Reaction (Supporting Information)

Magnesium bis(trifluoromethanesulfonyl)amide (Mg(TFSA)2)/glyme solutions are promising electrolytes for rechargeable magnesium batteries, but the passivation of the Mg electrode because of the decomposition of [TFSA]− anion from the coordination state is a critical issue in practical use. In the present study, functionalized nanofiber gel electrolytes swollen in 0.5 M Mg(TFSA)2/triglyme solution were prepared using the silica nanofibers modified with oxymagunesium chloride (–OMgCl) groups (f-SiO2NFs) as a gelator. The f-SiO2NF gel electrolyte improved the Mg plating/stripping reaction compared to the SiO2NF gel without –OMgCl groups.

镁双(三氟甲烷磺酰)胺（Mg(TFSA)2）/甘醇溶液作为可充电镁电池的电解质具有巨大潜力，然而，由于[TFSA]−阴离子从配位状态分解导致的镁电极钝化，在实用过程中成为了一个关键问题。在本研究中，通过使用含有氧化镁氯化物（–OMgCl）基团的二氧化硅纳米纤维（f-SiO2NFs）作为凝胶剂，制备了在0.5 M Mg(TFSA)2/三甘醇溶液中膨胀的功能化纳米纤维凝胶电解质。与未添加–OMgCl基团的二氧化硅纳米纤维凝胶电解质相比，f-SiO2NF凝胶电解质显著提升了镁的沉积/剥离反应。