Interface reconstruction via lithium thermal reduction to realize a long life all-solid-state battery

Lithium garnet solid-state electrolytes (SSEs) with high ionic conductivity and high electrochemical stability are promising in the new generation batteries, but the poor interface stability restricts their development. Here, a compatible Li/garnet interface is constructed in-situ through lithium thermal reduction (LTR), in which a Li2O interlayer with electronic insulation blocks the transfer of electrons to the electrolyte, and an oxygen vacancy (OV) interlayer with rapid ion diffusion kinetics uniforms lithium-ion flux at the interface. Benefiting from the dual-function of the interface, the reconstructed symmetrical lithium cell is cycled stably for 2500 h at 0.3 mA cm(-2), with a constant voltage polarization about 35 mV. The assembled all-solid-state lithium metal batteries (SSLMBs) exhibit a capacity retention of 93% after 1250 cycles at 1 C rate and 30 ?. This work provides an effective and convenient method for the integration of lithium metal anode in the garnet solid-state batteries

Automated summary

In this study, a compatible Li/garnet interface is constructed through lithium thermal reduction, which improves the interface stability and ion flux uniformity in the new generation batteries. The lithium cells and lithium metal batteries assembled using this method exhibit stable cycling and high capacity retention.