John B. Goodenough

For the development of lithium-ion batteries. In 1980 Goodenough showed that layered lithium cobalt oxide, $\ce{LiCoO2}$, is a cathode that reversibly releases and re-accepts lithium ions at about 4 V — doubling the cell voltage of the day and enabling the compact batteries commercialized a decade later. He later identified further key cathode materials such as $\ce{LiMn2O4}$ spinels and $\ce{LiFePO4}$, and remained active in solid-state battery research past age 95.