Dr Ryoji Kanno has been investigating materials for electrochemical energy conversion devices, particularly on lithium batteries and solid oxide fuel cells, since 1980. His ambition for new materials development is finding an oxide perovskite as cathode material for solid oxide fuel cells. He has developed new materials for all solid-state batteries for the next generation. He also developed mechanistic studies on lithium battery materials of layered rock salt, olivine, and thin-film model electrodes. Based on fundamental studies on solid-state chemistry, he developed many new materials for energy conversion and trying to indicate a new direction of the future battery systems.