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  • A 29.3 Wh kg−1 and 6 kW kg−1 pouch-type lithium-ion capacitor based on SiOx/graphite composite anode
  • Add time:07/17/2019         Source:sciencedirect.com

    Lithium-ion capacitors are considered as a promising energy storage device to combine the high energy of lithium-ion batteries and high power of supercapacitors, and it is urgently required to evaluate the energy storage capability of lithium-ion capacitors from practical perspectives. In this work, a pouch-type lithium-ion capacitor is constructed using commercial SiOx/graphite as anode and activated carbon as cathode. Due to the outstanding tap density and electrical conductivity of SiOx/graphite anode, the reversibility and charge storage of lithium-ion capacitor pouch is greatly improved, which can function stably within a wide voltage window of 1–4 V to achieve a maximum gravimetric energy and power density of 29.3 Wh kg−1 and 6 kW kg−1, respectively (based on the total weight of pouch). Moreover, the volumetric energy and power density of this pouch also reach 50 Wh L−1 and 10 kW L−1 (based on the total volume of pouch), respectively. The achievement of both gravimetric and volumetric energy performances promises a bright future for of lithium-ion capacitors toward electrical applications where large energy-storage in limited space is demanded.

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