摘要
Due to high ionic conductivity and wide electrochemical window,the garnet solid electrolyte is considered as the most promising candidate electrolyte for solid-state lithium metal batteries.However,the high contact impedance between metallic lithium and the garnet solid electrolyte surface seriously hampers its further application.In this work,a Li-(ZnO)_(x)anode is prepared by the reaction of zinc oxide with metallic lithium and in situ coated on the surface of Li_(6.8)La_(3)Zr_(1.8)Ta_(0.2)O_(12)(LLZTO).The anode can be perfectly bound to the surface of LLZTO solid electrolyte,and the anode/electrolyte interfacial resistance was reduced from 2319 to 33.75Ω·cm^(2).The Li-(ZnO)_(0.15)|LLZTO|Li-(ZnO)_(0.15) symmetric battery exhibits a stable Li striping/plating process during charge-discharging at a constant current density of0.1 m A·cm;for 100 h at room temperature.Moreover,a Li-(ZnO)_(0.15)|LLZTO-SPE|LFP full battery,comprised of a polyethylene oxide-based solid polymer electrolyte(SPE)film as an interlayer between LiFePO4(LFP)cathode and LLZTO solid electrolyte,presents an excellent performance at 60℃.The discharge capacity of the full battery reaches 140 mA·h·g^(-1)at 0.1 C and the capacity attenuation is less than3%after 50 cycles.
基金
subsidized by the National Natural Science Foundation of China(21776051)
the Nation Science Foundation of Guangdong(2018A030313423)
the College Students’Innovation and Entrepreneurship Training Program(S201911078039)。
