Progress and Prospects of Inorganic Solid‐State Electrolyte‐Based All‐Solid‐State Pouch Cells

All-solid-state batteries (ASSBs) have piqued global research interest because of their unprecedented safety and high energy density. Significant advances have been made in achieving high room-temperature ionic conductivity and good air stability of solid-state electrolytes (SSEs), mitigating the challenges at the electrode-electrolyte interface, and developing feasible manufacturing processes. Along with the advances in fundamental study, all-solid-state pouch cells using inorganic SSEs have been widely demonstrated, revealing their immense potential for industrialization. This Review provides an overview of inorganic all-solid-state pouch cells, focusing on ultrathin solid-state electrolyte membranes, sheet-type thick solid-state electrodes, and bipolar stacking. Moreover, several critical parameters directly influencing the energy density of all-solid-state Li-ion and Li-S pouch cells are outlined. Finally, perspectives on all-solid-state pouch cells are provided and specific metrics to meet certain energy density targets are specified. With this Review, we look to facilitate the development of inorganic all-solid-state pouch cells with high energy density and excellent safety. This article is protected by copyright. All rights reserved.