Nano Silicon Anode without Electrolyte Adding for Sulfide-Based All-Solid-State Lithium-Ion Batteries

All-solid-state lithium-ion batteries (ASSLBs) employing silicon (Si) anode and sulfide electrolyte attract much attention, since they can achieve both high energy density and safety. For large-scale application, sheet-type Si anode matching sulfide based ASSLBs is preferred. Here, a LiAlO₂ layer coated Si (Si@LiAlO₂) is reported for sheet-type electrode. This electrode employs conventional slurry coating methods without adding any sulfide electrolyte. The effect of LiAlO₂ coating on the electrochemical performance and morphology evolution of Si electrode is investigated. Since the high mechanical strength and ionic conductivity of LiAlO₂ layer can sufficiently relieve the huge expansion of Si and promote the Li⁺ diffusion, the electrochemical performance is significantly enhanced. The Si@LiAlO₂ electrodes deliver high coulombic efficiency exceeding 80% and hold considerable specific capacity of 1205 mAh g⁻¹ (150 cycles, 0.33 C). The Si@LiAlO₂| LiNi_0.83Co_0.11Mn_0.06O₂ full-cells exhibit a high reversible capacity of 147 mAh g⁻¹ (0.28 mA cm⁻²) and a considerable capacity retention of 80.2% (62 cycles, 2.8 mA cm⁻²). This work demonstrates promising practicability and provides a new route for the scalable preparation of Si electrode sheets for ASSLBs with extended lifespan.