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When designing a new energy-storage device, scientists consider both how much energy a system stores (its energy density) and how quickly it charges and discharges (its power density). Typically, improving one of these properties degrades the other. Now Kirk Bevan at McGill University, Canada, and his colleagues propose a device called a pseudocapacitive battery that uses a phenomenon called quantized capacitance to provide both a high energy density and a high power density [1]. The team says that many energy-storage applications could benefit from such a device.

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