Stable Thiophosphate-based All-Solid-State Lithium Batteries through Conformally Interfacial Nano Coating.

All-solid-state lithium batteries (ASLBs) are promising for next generation energy storage system with critical safety. Among various candidates, thiophosphate-based electrolytes have shown great promises because of their high ionic conductivity. However, the narrow operation voltage and poor compatibility with high voltage cathode materials impede their application in the development of high energy ASLBs. In this work, we studied the failure mechanism of Li6PS5Cl at high voltage through in situ Raman spectra and investigated the stability with high-voltage LiNi1/3Mn1/3Co1/3O2 (NMC) cathode. With a facile wet chemical approach, we coated a thin layer of amorphous Li0.35La0.5Sr0.05TiO3 (LLSTO) with 20 nm at the interface between NMC and Li6PS5Cl. We studied different coating parameters and optimized the coating thickness of the interface layers. Meanwhile, we studied the effect of NMC dimension to the ASLBs performance. We further performed the first principles thermodynamic calculations to understand the electrochemical stability between Li6PS5Cl and carbon, NMC, LLSTO, NMC/LLSTO. Attributed to the high stability of Li6PS5Cl with NMC/LLSTO and outstanding ionic conductivity of the interface layer and Li6PS5Cl, the electrochemical stability window of Li6PS5Cl was greatly improved to 4.0 V (vs. Li-In). At room temperature, the ASLB exhibit outstanding capacity of 107 mAh g-1 and keep stable for 420 cycles with a high capacity retention of 93.5 % at C/3.

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