Outstanding cycle stability and rate capabilities of the all-solid-state Li-S battery with a Li7P3S11 glass-ceramic electrolyte and a core-shell S@BP2000 nanocomposite

All-solid-state Li-S batteries (ASSLSBs) can substantially alleviate poly-sulfide shuttling, which greatly improves the electrochemical performance of Li-S batteries. However, poor cycling and rate performances are still severe challenges for ASSLSBs and are mainly ascribed to the low ionic conductivity of the solid electrolyte and the unstable cathode/solid electrolyte interface resulting from the volume variation during the repeated charge-discharge process. In consideration of this, a Li7P3S11 glass-ceramic solid electrolyte with high ionic conductivity and a S@BP2000 nanocomposite with a core-shell structure are introduced to fabricate a novel ASSLSB in this work. As expected, the S@BP2000 cathode in the fabricated ASSLSB displays outstanding specific capacity (1391.3 mA h g(-1), 0.2 C) and rate performance (678.6 mA h g(-1), 4 C) and ultrahigh cycling performance (capacity retention of nearly 100% after 1200 cycles, 3 C) at room temperature. Moreover, further improved specific capacity (1597.7 mA h g(-1), 0.2 C) and rate performance (1092.9 mA h g(-1), 8 C) can be obtained at 80 degrees C, benefiting from the improved ionic conductivity at higher test temperature. The ultrahigh cycling and rate performances indicate that this strategy may provide a tremendous opportunity for constructing high-performance ASSLSBs.