An aqueous metal-ion battery and a method for constructing same. In one embodiment, the battery includes an aqueous electrolyte and at least one electrode comprising at least one organic electrode material. A method comprises incorporating an organic electrode material into the electrode of an aqueous metal-ion battery. The organic electrode material further comprises at least one material chosen from carbonyl compounds.
 STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
 This invention was made in part with Government support under award titled "Aqueous lithium-ion batteries with high-energy novel organic anodes for safe and robust energy storage" by The U.S. Department of Energy (award number: DE-AR0000380). The Government has certain rights in this invention.