cylonlover writes: While batteries can store large amounts of energy, they cannot dispense it quickly and they can only survive about one thousand charge-discharge cycles. Conversely, supercapacitors can release energy in quick bursts and last for hundreds of thousands of cycles, but they can't store quite as much energy. Recent advances in both battery and capacitor technology have been working toward a perfect marriage of the two. Researchers at Drexel University are developing an electrochemical flow capacitor (EFC) that combines the storage capabilities of batteries with the much longer cycle life and power output of supercapacitors. The team's goal is to improve the stability of the energy grid and ease the integration of renewable energy sources.