Electrochemical Capacitor/Battery Energy Storage Device Capable of Self-Charging

Background: Batteries convert stored chemical energy into electrical energy and typically are divided into two broad classes primary and secondary. Primary batteries such as alkaline batteries convert stored chemical energy to electrical energy by oxidation and reduction reactions that result in geochemically unfavorable restructuring and depletion of chemical reactants. When the initial supply of chemical reactants is exhausted the battery cannot be readily recharged. Secondary batteries such as lithium-ion batteries also convert stored chemical energy to electrical energy. Converting stored chemical energy to electrical energy in secondary batteries does not involve an unfavorable geochemical restructuring. Secondary batteries can be readily recharged by applying electrical energy to the battery reversing the chemical reactions and restoring the chemical energy in the battery. Two drawbacks of existing secondary batteries are their need for an external energy source to recharge and a relatively low energy yield compared to the energy used to charge them. A need exists for an electrochemical device that self-charges and can provide open circuit potential similar to conventional batteries. Technology Description: UW–Madison researchers have developed a self-charging electrochemical device which could be incorporated into electronic cards such as RFID cards or garage door opener transponders. The device includes an electrically conductive material between the electrodes that is coated with a nanoporous oxide. By incorporating the coated material a single combination electrochemical device with the ability to self-charge is produced. Applications: 1) Self-charging secondary battery/capacitor devices 2) Electronic cards such as RFID cards and garage door opener transponders Opportunity for collaboration: The Wisconsin Alumni Research Foundation (WARF) is seeking commercial partners interested in developing self-charging electrochemical storage and delivery devices and applications.