Application of BN‐Based Materials in Electrolytes for High‐Performance Solid‐State Lithium Metal Batteries

Solid‐state lithium metal batteries (SSLMBs) are widely recognized as next‐generation energy storage devices with great potential. However, their commercialization has been hindered by bottleneck issues related to solid electrolytes (SEs), including poor mechanical strength, inadequate thermal management capabilities, poor interface stability, and limited room‐temperature ionic conductivity. Boron nitride (BN), with its diverse crystal structures and excellent performance, has been widely used in electrolytes for SSLMBs. Herein, we provide a comprehensive review of research progress on BN‐based materials applied in solid‐state electrolytes (SSEs) for SSLMBs. First, the relationships of the basic structure, properties, and synthesis of BN are briefly elucidated. Subsequently, the application strategies and mechanisms of raw/modified BN in polymer‐based and inorganic solid electrolytes are systematically elaborated and discussed, emphasizing its role in enhancing mechanical strength, inhibiting lithium dendrites’ growth, optimizing ion transport, and stabilizing the interfaces. Representative research results demonstrate that SSEs incorporated with BN‐based materials can significantly enhance the cycling stability, ionic conductivity, and rate performance of SSLMBs. Finally, the challenges and future development directions of BN‐based materials in SSEs were proposed, aiming to provide useful references for the design of high‐performance SSEs and their practical applications.