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Issue 13, 2013
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A high performance hybrid capacitor with Li2CoPO4F cathode and activated carbon anode

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Abstract

For the first time, we report the possibility of utilizing Li2CoPO4F as a novel cathode material for hybrid capacitor applications. Li2CoPO4F powders were prepared by a conventional two-step solid state method. A hybrid cell was fabricated using Li2CoPO4F as the cathode along with activated carbon (AC) as the anode in 1 M LiPF6 dissolved in 1 : 1 EC/DMC electrolyte and its electrochemical properties were examined by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and constant current charge–discharge (C–D) techniques. The Li2CoPO4F/AC cell is capable of delivering a discharge capacitance of 42 F g−1 at 150 mA g−1 current density within 0–3 V region having excellent coulombic efficiency of over 99% even after 1000 cycles. Furthermore, the Li2CoPO4F/AC cell exhibited excellent rate performance with an energy density of ∼24 W h kg−1 at 1100 mA g−1 current and maintained about 92% of its initial value even after 30 000 C–D cycles. Electrochemical impedance spectroscopy was conducted to corroborate the results that were obtained and described.

Graphical abstract: A high performance hybrid capacitor with Li2CoPO4F cathode and activated carbon anode

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Publication details

The article was received on 12 Feb 2013, accepted on 17 Apr 2013 and first published on 25 Apr 2013


Article type: Paper
DOI: 10.1039/C3NR00760J
Citation: Nanoscale, 2013,5, 5958-5964
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    A high performance hybrid capacitor with Li2CoPO4F cathode and activated carbon anode

    K. Karthikeyan, S. Amaresh, K. J. Kim, S. H. Kim, K. Y. Chung, B. W. Cho and Y. S. Lee, Nanoscale, 2013, 5, 5958
    DOI: 10.1039/C3NR00760J

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