Perspective on Material Design and Interface Engineering toward Low‐Stack‐Pressure All‐Solid‐State Lithium Batteries

All-solid-state lithium batteries (ASSLBs) have garnered worldwide attention as promising next-generation energy storage technologies owing to their high energy densities and enhanced safety. However, their long cyclability remains unsatisfactory for practical application, primarily due to poor solid-solid interfacial contact. A high stack pressure is often required during operation, hampering their commercialization. This perspective presents a fundamental understanding of the roles of stack pressure in ASSLBs and analyzes the intrinsic challenges to achieve optimal battery performance under low-stack-pressure conditions. Recent advances for reducing high-stack-pressure demands are summarized from the point of views of solid electrolyte/ active electrode material design and interface engineering. Finally, the perspective layouts the key challenges and prospects for future breakthroughs to achieve low-stack-pressure ASSLBs. It is hoped that the material-centered solutions highlighted in this perspective will inspire meaningful progress in future advanced battery systems.