Role of Interfaces in Solid‐State Batteries

Solid‐state batteries (SSBs) are considered as one of the most promising candidates for the next‐generation energy‐storage technology, because they simultaneously exhibit high safety, high energy density, and wide operating temperature range. The replacement of liquid electrolytes with solid electrolytes produces numerous solid–solid interfaces within the SSBs. A thorough understanding on the roles of these interfaces is indispensable for the rational performance optimization. In this review, the interface issues in the SSBs, including internal buried interfaces within solid electrolytes and composite electrodes, and planar interfaces between electrodes and solid electrolyte separators or current collectors are discussed. The challenges and future directions on the investigation and optimization of these solid–solid interfaces for the production of the SSBs are also assessed. Solid–solid interfaces play a critical role in the electrochemical performance of solid‐state batteries. This review provides an overview on the solid–solid interfaces from aspects of structural features, Li‐ion transport, interfacial contact, and electro‐chemical reactions. The existing interface issues and improvement strategies are discussed. Opportunities and future trends on the investigation and optimization of these interfaces are highlighted.