AbstractTo build an environment‐friendly energy‐based society, it is important to develop stable and high‐performance batteries as an energy storage system. However, there are still unresolved challenges associated with safety issues, slow kinetics, and lifetime. To overcome these problems, it is essential to understand the battery systems including cathode, electrolyte, and anode. Using a well‐controlled material system such as epitaxial films, textured films, and single crystals can be a powerful strategy to investigate the relationship between microstructural and electrochemical properties. In this review, we discuss the need for research with well‐controlled materials system and recent progress in the well‐controlled cathode, solid‐state‐electrolyte, and anode materials for Li‐ion batteries. Enhanced stability and electrochemical performance due to the facilitation of prolonged and endured Li‐ion transport in facet‐controlled battery materials are highlighted. Finally, the challenges and future directions utilizing the well‐controlled battery system for high‐performance battery are proposed.