Two-Dimensional MoS₂ NS@Li₇P₃S₁₁ Composite Cathode for All-Solid-State Lithium Batteries

All-solid-state lithium batteries (ASSLBs) are one of the most promising next-generation energy storage devices due to their superior safety. Nonetheless, one of the primary challenges confronting current solid-state battery designs is the contact failure associated with electrode volume expansion, which causes an increasing interface impedance and ultimately battery failure. Herein, we are dedicated to addressing the issue of volume expansion in the composite cathode during charging and discharging as well as to preventing the separation of electrodes and electrolyte. To achieve this, a two-dimensional MoS2 NS@Li7P3S11 composite cathode was fabricated through a chemical exfoliation process, followed by the in situ deposition of a Li7P3S11 electrolyte. The ultrathin nature of the MoS2 nanosheets effectively counteracts volume expansion during cycling. Concurrently, the in situ formation of the electrolyte layer precludes separation of the electrode and electrolyte components. In addition, the introduction of the metallic 1T phase obviously enhances the electronic conductivity, approximately 2 orders of magnitude higher than bulk MoS2. As a result, ASSLBs equipped with the MoS2 NS@Li7P3S11 cathode demonstrate superior structural stability along with high reversible capacity and outstanding cyclic durability.