A New Boron Containing Lithium Salt as an Additive Boosting Lithium Metal Batteries
At present,lithium hexafluorophosphate(LiPF6)has become a commercial lithium salt because of its best comprehensive performance.However,the decomposition of LiPF6 under high temperature and inferior interfacial stability limits its further development.Hence,we synthesize a new type of lithium salt,lithium perfluoropinacolatoborate(LiFPB)as an additive through a simple one-step reaction.The anion of LiFPB can be preferentially adsorbed and decomposed on the surface of Li anode,forming a conductive and robust solid electrolyte interface(SEI)layer.The addition of trace amounts of LiFPB additive(0.03 mol/L)to 1 mol/L LiPF6-EC/DMC can effectively inhibit the growth of lithium dendrite.Li/Cu(average Coulombic efficiency of 97.1％)and Li/Li cells exhibit good lithium plating/stripping stability during cycling.It also shows excellent cycling stability in LCO/Li metal batteries(86％capacity retention after 500 cycles)and realizes the practical application of LiPF6 based electrolytes at high temperatures.This study reveals the importance of designing novel additives.
lithium metal batteryadditivehigh temperaturesolid electrolyte interface
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维普
