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

Abstract

ABSTRACT 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.