As the world grapples with the transition to sustainable energy sources, the demand for materials with high-performance electrodes, electrolytes, and catalysts has become paramount. The energy transition necessitates materials with increased energy and power density for advanced energy storage devices, while the emergence of future fuels like hydrogen requires economically viable electrocatalysts for mass production. In response to these challenges, Engineering Materials for Efficient Energy Storage and Conversion addresses these pressing concerns through an interdisciplinary lens that combines materials science, chemistry, physics, and engineering. Within the pages of Engineering Materials for Efficient Energy Storage and Conversion, a comprehensive exploration unfolds, delving into cutting-edge R&D in energy technologies. The book takes a deep dive into critical areas such as fuel cells, thermal battery materials, hydrogen storage, and materials for thermal management. By providing in-depth insights into the electrochemical, physicochemical, and structural aspects of energy technologies, the book aims to advance functional materials and devices crucial for the sustainable future of energy storage and conversion. This compendium not only presents theoretical frameworks but also offers the latest empirical research findings, contributing significantly to the evolution of the field.