Efficient Fabrication of High-Capacity Silicon Composite Anodes for All-Solid-State Lithium-Ion Batteries

Silicon is a promising anode material for all-solid-state Li-ion batteries (ASSLIBs), due to its high capacity; however, it suffers from considerable volume expansion (>300%) during cycling, resulting in poor capacity retention, low areal capacities, and low rate capabilities. To address these issues, we propose a μSi/SWCNT/LPSCl composite that effectively coats micrometer-sized Si (μSi) particles with Li6PS5Cl and single-walled carbon nanotubes (SWCNTs). This composite improved electrical and ionic conductivities, suppressed interface decomposition between μSi and the Li6PS5Cl solid electrolyte during cycling, and mitigated volume expansion to prevent cracks and contact loss. The μSi/SWCNT/LPSCl anode shows a high initial capacity (2974 mAh g–1 at a 0.1 C rate) and stable retention for 400 cycles. Furthermore, a full cell with this anode and a LiNi0.8Co0.1Mn0.1O2 cathode exhibited excellent reversibility and stable cycling performance. We anticipate this study will provide a solution for high-performance Si-based anodes in ASSLIBs.