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.
关键词
锂金属电池/添加剂/高温/固态电解质界面
Key words
lithium metal battery/additive/high temperature/solid electrolyte interface
维普
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