Building a Better Li‐Garnet Solid Electrolyte/Metallic Li Interface with Antimony

The deployment of Li-garnet Li7La3Zr2O12 (LLZO) solid-state electrolytes in batteries is severely hampered by their poor wettability with metallic Li. In this work, Sb presented as a compelling interfacial layer allowing superior wetting Li onto LLZO surface, resulting remarkably low Li/LLZO resistance 4.1(1) Ω cm2. An atomistic insight into Sb-coated interface using soft and hard X-ray photoelectron spectroscopy focused ion beam time-of-flight secondary mass spectrometry shows the formation Li-Sb alloy an interlayer. It determined that Li/Sb-coated LLZO/Li symmetrical cells exhibit high critical current density up to 0.64 mA cm−2 overpotentials 40–50 mV at 0.2 without applying external pressure. electrochemical performance coated-LLZO pellets also assessed intercalation-type V2O5 cathode. Li/Sb-coated-LLZO/V2O5 full deliver stable capacities around 0.45 mAh cm−2, peak 0.3 cm−2.