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 LiAlO 2 layer coated Si (Si@LiAlO 2 ) is reported for sheet-type electrode. This electrode employs conventional slurry coating methods without adding any sulfide electrolyte. The effect of LiAlO 2 coating on the electrochemical performance and morphology evolution of Si electrode is investigated. Since the high mechanical strength and ionic conductivity of LiAlO 2 layer can sufficiently relieve the huge expansion of Si and promote the Li + diffusion, the electrochemical performance is significantly enhanced. The Si@LiAlO 2 electrodes deliver high coulombic efficiency exceeding 80% and hold considerable specific capacity of 1205 mAh g −1 (150 cycles, 0.33 C). The Si@LiAlO 2 | LiNi 0.83 Co 0.11 Mn 0.06 O 2 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.