Processing and Compositional Effects on the Stability of All‐Inorganic Metal Halide Perovskite Anodes: A Comparative Study of Dry‐ vs. Slurry‐Fabricated Electrodes

ABSTRACT The stability of all‐inorganic metal halide perovskite anodes is critically dependent on the electrode fabrication method, a factor often overlooked. This work compares the structural and electrochemical performance of slurry‐cast versus solvent‐free dry‐processed anodes using CsPbBr 3 (lead‐based) and Cs 2 AgBiBr 6 (lead‐free) perovskites. We find that the conventional slurry process induces a catastrophic degradation of the CsPbBr 3 structure into its constituent products before cycling, whereas the dry‐processing method successfully preserves the pristine perovskite phase. Consequently, the dry‐fabricated CsPbBr 3 electrode exhibits excellent cycling stability driven by a reversible Li‐Pb alloying mechanism, significantly outperforming the rapidly fading Cs 2 AgBiBr 6 anode. These findings demonstrate that for this class of materials, optimizing the fabrication process to prevent chemical degradation is a primary and critical step toward achieving stable electrochemical performance.