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Moisture Stability of Sulfide Solid Electrolytes: Systematic Comparison and Mechanistic Insight" by Dr. Yusuke Morino et al. selected as an Editor's Choice for the 71 st Special Feature, "New Progress of Batteries and Fuel Cells" recommended jointly by the guest editors from The Committee of Battery Technology and the editorial board.In this article, the authors systematically investigate the moisture stability of various sulfide solid electrolytes (SEs) and elucidate distinct mechanisms responsible for the degradation of lithium ionic conductivity upon exposure to moisture.A quantitative comparison was conducted for SEs with different crystal structures, including Li 6 PS 5 Cl, Li 3 PS 4 , and Li 4 SnS 4 , in order to offer a more comprehensive understanding of their respective degradation behaviors.This comparative study revealed that the SEs undergo two different degradation pathways: hydrolysis and hydration.Notably, both Li 3 PS 4 and Li 4 SnS 4 exhibited a comparable decline in lithium ionic conductivity to that of Li 6 PS 5 Cl, despite generating significantly less H 2 S gas.This observation suggests that the underlying deterioration mechanisms differ among the materials.This cover art was created and