This book presents a carefully selected collection of peer-reviewed research papers from the 2nd International Symposium on Advanced Energy Materials and Next-Generation Storage Technologies (AEMST 2026), held in Xi'an, China, from April 25 to 27, 2026. The proceedings cover emerging battery systems beyond lithium-ion, solid-state, and hybrid energy storage technologies, supercapacitors, hydrogen-related materials, and next-generation photovoltaic and photoelectrochemical systems. Special emphasis is placed on AI-assisted materials design, data-driven discovery, multiscale modeling, and advanced in situ and operando characterization techniques, alongside innovations in nanostructured materials, interface engineering, sustainable energy materials, and scalable manufacturing processes. By integrating fundamental research with engineering and system-level perspectives, this book captures key trends and breakthroughs addressing global challenges in energy efficiency, sustainability, and carbon neutrality, serving as a valuable reference for researchers, engineers, and graduate students in academia and industry.