Reversible Nano Crystalline-Phase Transformation in Si-Based Anode Enables Stable All-Solid-State Batteries

P nanocrystalline phases during cycling, which mitigated the expansion stress of the electrode, maintaining its structural stability. Meanwhile, Zn and P reduced the Li-ion diffusion energy barrier and band gap of Si, improving the ion/electron transport ability within the electrode. The NCM90-based full cell incorporating this anode demonstrates stable operation for over 3,000 cycles at 2C rate. This alloy-based anode design offers an effective pathway for developing long-cycle-life all-solid-state batteries.