Project K Energy

Project K is developing and commercializing a potassium-ion battery, which operates similarly to lithium-ion batteries. During discharge, potassium ions move from the negative graphite electrode through the electrolyte—a liquid combining organic solvents, dissolved conductive salts, and specialty additives—to the positive electrode, which contains a Prussian blue analog material synthesized from low-cost and abundant raw materials. Potassium ions can migrate through the electrolyte much faster than lithium ions. Additionally, the thermodynamics of the reaction of potassium ion with graphite allows much higher currents to be applied to the cell. These two fundamental properties of the potassium-ion system allow it to charge much faster than lithium-ion batteries while also enabling operation at reduced temperatures.