Stable cyclability of porous Si anode applied for sulfide-based all-solid-state batteries

Abstract Porous Si was applied as the anode material to all-solid-state lithium-ion batteries with Li 3 PS 4 electrolyte. The ball-milled porous Si composite anode exhibited a high capacity retention over 90 % at 100 cycles. In contrast, the poorer cycle stability was observed for the non-porous Si composite anodes. The structural models were proposed to consistently explain all the cycle characteristics. We believe that the pores in Si particles relieved the large volume change during the lithiation and delithiation, resulting in the high capacity retention.