Recent advances in anion-derived SEIs for fast-charging and stable lithium batteries

The construction of stable and reliable electrode interfaces is one of the key scientific issues widely encountered by the battery community. An anion-derived solid electrolyte interphase (SEI) has been recently reported to outperform the traditional solvent-rich SEI in inhibiting side reactions, motivating ion transport and regulating electrode reactions in working Li batteries. Here, we first explicitly introduce the fundamental characteristics of anion-derived SEIs and then concisely present novel developments in electrolyte chemistry involving highly concentrated, localized highly concentrated and weakly solvating electrolytes, which facilitate the formation of anion-derived SEIs on anodes. The critical significance of these SEIs for building fast-charging and stable Li batteries is particularly highlighted. Finally, we outline the future challenges of designing Li metal interfaces to further enhance the cycling reversibility and lifespan of working batteries.