This book presents a carefully selected collection of peer-reviewed research papers from the International Symposium on Advanced Energy Materials and Next-Generation Storage Technologies (AEMST 2025), held in Bali, Indonesia, from July 27 to 29, 2025. Reflecting the interdisciplinary nature of materials science and engineering, the proceedings cover a wide range of advanced topics, including energy materials, advanced battery technologies, supercapacitors, hydrogen storage, solid-state energy systems, and next-generation solar cells. Special focus is given to new materials processing techniques, energy solutions enabled by nanotechnology, and the detailed study and testing of materials essential for energy applications. By combining basic research with practical engineering innovations, this book highlights emerging trends and major breakthroughs that address the increasing global demand for efficient and sustainable energy storage solutions. As a valuable resource, this book is designed for researchers, engineers, and professionals in both academic and industrial fields, as well as graduate students aiming to stay updated on the latest developments in energy materials and storage technologies.