Safe LAGP-based all solid-state Li metal batteries with plastic super-conductive interlayer enabled by in-situ solidification

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 Li1.5Al0.5Ge1.5(PO4)(3) (LAGP) electrolyte by in-situ solidifying succinonitrile-based plastic interlayer with Li6.4La3Zr2Al0.24O12 (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 vertical bar 1-SN vertical bar LAGP vertical bar 1-SN vertical bar Li symmetric cell can stably cycle for 240 h without short circuit at room temperature (R.T). This approach enables a high specific capacity of 152.5 mAh g(-1) at 0.1C for Li vertical bar 1-SN vertical bar LAGP vertical bar 1-SN vertical bar LiFePO4 cells at R.T. Furthermore, the integrated ASSLMBs show excellent cyclic stability at 40 degrees C with an initial discharge capacity of 168.4 mAh g(-1) at 0.5C and retention of 93.17% after 100 cycles. The super-ionic property at the interface makes excellent rate performance of ASSLMBs at 40 degrees C. This strategy is facile and efficient in promising safe and outstanding ASSLMBs and also has some referential values for other unstable electrolyte interface beyond LAGP.