摘要：SummaryInterfacial instability between solid electrolytes (SEs) and lithium metal remains a daunting challenge for solid-sate batteries. Here, a conformal C60interlayer is efficiently constructed on Li1.5Al0.5Ge1.5(PO4)3(LAGP) SEs by physical vapor deposition, and an ideal interfacial contact is achieved via forming an ionically conducting matrix of LixC60with lithium metal. The obtained LixC60is beneficial to hinder the growth of lithium dendrites at interface and release the local stress during the lithiation and delithiation. As a result, the Li/LAGP-C60/Li symmetric cells demonstrate ultra-stable cycling performance for more than 4,500 h at a current density of 0.034 mA cm−2. The Li/LAGP-C60/LiFePO4full cells deliver a reversible capacity of 152.4 mAh g−1at room temperature, and the capacity retention rate is 85% after more than 100 cycles. This work provides a feasible and scalable strategy to improve the SEs/Li interface for high-performance solid-state batteries.Graphical AbstractDisplay OmittedHighlights•Ionically conducting LixC60matrix is formed at Li-LAGP interface•Li/LAGP-C60/Li cells display ultra-long cycle life of 6 months•Li/LAGP-C60/LFP cells exhibit high capacity with good cycle performance•Mechanical integrity of cycled LAGP-C60is validated by X-ray CTEnergy Storage; Energy Systems; Energy Materials
