《Juggling Formation of HF and LiF to Reduce Crossover Effects in Carbonate Electrolyte with Fluorinated Cosolvents for High-Voltage Lithium Metal Batteries》

Fluorinated molecules have been widely employed in high-voltage lithium metal batteries, including fluoroethylene carbonate, 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl-ether, etc. Nevertheless, they are prone to β-hydrogen assisted defluorination to produce corrosive HF. In this study, fluorinated aromatics are introduced to carbonate electrolyte restrain HF formation but strengthen LiF formation, evidence by the high energy barrier and high bond energy of β-sites hydrogen. This study designs an efficient electrolyte that generates robust electrode/electrolyte interphases and restrains by-products formation spontaneously, thus shedding new light on electrolyte toward applicable LMBs.

https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.202212000