Koichi Mizushima (水島公一, Mizushima Kōichi; born January 30, 1941) is a Japanese researcher known for discovering lithium cobalt oxide (LiCoO2) and related materials for the lithium-ion battery (Li-ion battery). He was affiliated with the University of Tokyo before he went on to work for Toshiba.
Source: “Koichi Mizushima (scientist)”, English Wikipedia (CC BY-SA 4.0), excerpt