Towards the high energy density batteries via fluoride ions shuttling in liquid electrolytes: A review

Abstract

Summary Fluorine, as the most electronegative element, provides the highest electrode potential when it undergoes redox reactions. Moreover, fluoride ion is intrinsically an excellent charge carrier in both electrolytes and electrode structures owing to its small size, low atomic weight, and good ionic mobility. Hence, batteries based on fluorine electrochemistry, the so‐called fluoride ion batteries (FIBs), have recently been deemed as an alternative next‐generation high energy density battery system. This article reviews the recent progress in FIBs based on liquid electrolytes. The mechanisms, advantages, and drawbacks of FIBs are discussed. In the end, the perspective illuminating the research directions for further development is presented.

Structure design of a BiOF solid electrolyte with remarkably outstanding fluoride ion diffusion performance induced by Ga doping

“…This value is eight times those of common lithium-ion batteries. 14,15 Besides, FIBs possess a wide electrochemical potential window because uorine is the most electronegative halogen element. 16,17 Furthermore, the uoride ions have a low degree of solvation and the lightest mass among the halogen elements, which induces latent excellent rate performance.…”