Abstract
AbstractThe development of alternative energy storage technologies such as sodium‐ion hybrid capacitors, which do not rely on critical raw materials such as cobalt or nickel, for the replacement of conventional lithium‐ion batteries for some niche applications, is extremely important to successfully achieve a sustainable development in our planet. In this work, we introduce a novel sodium‐ion hybrid capacitor system formed by the combination of an optimized nanostructured composite material containing reduced graphene oxide and tin pyrophosphate as negative electrode, and a high specific surface area graphene‐carbon composite as positive electrode. The electrochemical performance of each material has been individually evaluated using NaPF6 in EC/DMC as electrolyte, showing impressive specific capacity values above 100 mAh g−1 at 2 A g−1, for both faradaic and capacitive‐type electrodes. The integration of the electrodes in an optimized full cell with anode‐to‐cathode mass balance of 1.5 : 1, enabled stable full cells that can provide energy densities of almost 60 Wh kg−1 at 3,000 W kg−1, showcasing the potential of these type of materials in the design of next generation energy storage systems.
Published Version
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