Abstract
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 33.75 Ω·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 of 0.1 mA·cm −2 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 LiFePO 4 (LFP) cathode and LLZTO solid electrolyte, presents an excellent performance at 60 °C. The discharge capacity of the full battery reaches 140 mA·h·g −1 at 0.1 C and the capacity attenuation is less than 3% after 50 cycles.
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