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• Three high pure LiSiPSCl electrolytes were synthesized at 450/475/500 °C for 8 h. • Li/Li-In anode & LiNbO 3 -coated LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode were selected. • LiSiPSCl-based blocking/symmetrical/semi-blocking cells & ASSLIBs were assembled. • Optimized NCM@LNO//SE-475//Li-In ASSLIB exhibited good cycle/rate performance. The lithium silicon phosphor sulfo-chloride (LiSiPSCl) with a Li 10 GeP 2 S 12 -type structure is one of the most promising solid electrolytes (SEs) for all-solid-state lithium-ion batteries (ASSLIBs) due to its currently highest ionic conductivity at RT. In this work, three kinds of LiSiPSCl electrolytes, i.e. Li 7.59(10) Si 1.95(9) P 1.65(7) S 11.64(1) Cl 0.36(1) (SE-450), Li 7.67(12) Si 1.90(1) P 1.67(1) S 11.61(2) Cl 0.39(2) (SE-475) and Li 7.58(5) Si 1.75(4) P 1.79(2) S 11.54(4) Cl 0.46(4) (SE-500), were prepared at 450 / 475 / 500 °C for 8 h through a solid-state method. The assembling of blocking / symmetrical / semi-blocking cells and ASSLIBs, and electrochemical measurements were carried out by coupling the three SEs with two kinds of anodes (Li metal and Li-In alloy) and one cathode of LiNbO 3 -coated LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM@LNO). Studies were focused on the relationship among chemical compositions, phase structures and electrochemical properties, as well as the electrolyte/electrode interfacial stability. Results show that LiSiPSCl electrolytes had favorable interfacial stability with Li-In anode and exhibited low polarization voltage (< 20 mV) and decomposition current (< 0.01 mA). The optimized NCM@LNO//SE-475//Li-In of ASSLIBs exhibited a stable long-term cycle performance with a capacity retention of 97.0% (128.4 mAh g−1) after 50 cycles and 81.1% (107.4 mAh g−1) after 100 cycles at 0.1 C. In addition, it exhibited a good rate performance while its capacity retention remained 99.3% (140.6 mAh g−1) after 39 cycles at 0.05 / 0.1 / 0.2 / 0.5 / 0.05 C. [Display omitted] [ABSTRACT FROM AUTHOR]