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Safe and high-energy-density all solid-state lithium metal batteries (ASSLMBs) are great in demand for future electrical vehicle and grid energy storage. The compatibility of electrode-electrolyte interface is a critical factor influencing the electrochemical performance of ASSLMBs. Herein, we propose a plastic super-conductive carrier to deter untoward reaction between Li anode and Li_1.5Al_0.5Ge_1.5(PO₄)₃ (LAGP) electrolyte by in-situ solidifying succinonitrile-based plastic interlayer with Li_6.4La₃Zr₂Al_0.24O₁₂ (LLZAO) nanowires (l-SN). The method of in-situ solidification promises the low interfacial resistance. The l-SN interlayer can not only act as a physical obstacle to isolate LAGP pellet from Li metal, but also provide three-dimensional ion channels to regulate the transfer of Li ions, delivering an uniform Li ion distribution for dendrite-free Li deposition. The Li|l-SN|LAGP|l-SN|Li symmetric cell can stably cycle for …