Mixed lithium fluoride-nitride ionic conducting interphase for dendrite-free lithium metal anode

摘要

The lithium (Li) metal battery reveals appealing merits in energy density but suffers from problems of dendrite growth and low coulombic efficiency before its applications. The ether electrolytes entitle Li metal batteries with more smooth Li stripping/deposition but narrow electrochemical stability in contrast to carbonate electrolyte. circumventing this contradictory, a lithium fluoride-nitride mixed ionic conducting interphase was embedded on lithium surface via formulated fluorine-rich carbonate and cyclophosphonitrile, which renders a dendrite-free plating/stripping over 2200 h and extend the electrochuemcial window of ether electrolyte to 4.5 V with the assistance of experiments and calculating simulations, ensuring LiCoO2 to operate efficiently over 200 cycles with nearly no capacity decay.