<p>An all-solid-state lithium–sulfur cell employing a lithium phosphorus sulfur chloride (Li₆PS₅Cl) solid-state electrolyte and electroless-tin-plated sulfur solid-state composite cathodes is demonstrated as a viable architecture for next-generation energy-storage systems. To investigate the role of tin-plating layer, tin-plated sulfur cathodes with systematically varied tin contents are synthesized and evaluated. Owing to the optimized electronic conduction network and enhanced sulfur redox kinetics, the tin-plated sulfur 25 (tin-plated sulfur composites containing 25 wt% tin) cathode exhibits improved rate performance, delivering high discharge capacities of 1502, 1247, 1046, and 620&#xa0;mA h g^–1 at C/10, C/2, 1&#xa0;C, and 2&#xa0;C rates, respectively. During long-term cycling at a C/2 rate, the all-solid-state cell with tin-plated sulfur 25 cathode achieves a high initial capacity of 1226&#xa0;mA h g^–1 and retains 80% of its capacity after 1000 cycles, indicating excellent cyclability. Moreover, stable operation is further maintained over 10,000 cycles at high 1&#xa0;C rate with a discharge/charge efficiency approaching 100%. Even under high sulfur loading, the tin-plated sulfur 25 cathode sustains an areal capacity of 4&#xa0;mA h cm^–2. The enhanced electrochemical performance originates from the dual functionality of tin plating, which establishes continuous electron-transport pathways while simultaneously facilitating solid–solid sulfur redox reactions, in combination with the high ionic conductivity and interfacial compatibility of the Li₆PS₅Cl electrolyte. These results highlight the effectiveness of hybrid metal–sulfur composite cathodes integrated with sulfide solid electrolytes, providing a promising pathway toward safe, high-energy-density all-solid-state lithium–sulfur batteries.</p> Graphical abstract <p></p>