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Issue 31, 2012
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High power lithium-ion hybrid electrochemical capacitors using spinel LiCrTiO4 as insertion electrode

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Abstract

We report the synthesis and electrochemical performance of sub-micron size LiCrTiO4 particles prepared by a solid-state approach. X-ray diffraction and transmission electron microscopic studies are used to analyze the structural and morphological properties, respectively, of the synthesized powders. Electrochemical Li-insertion properties are evaluated in half-cell configurations (Li/LiCrTiO4) by means of both galvanostatic and potentiostatic modes between 1 and 2.5 V vs. Li. Reversible insertion of almost one mole of lithium (∼155 mA h g−1) is noted at a low current rate of 15 mA g−1 and rendered an excellent cycling profile as well. A non-aqueous Li-ion electrochemical hybrid capacitor (Li-HEC) is fabricated with an optimized mass loading of activated carbon (AC) cathode and synthesized LiCrTiO4 as anode in 1 M LiPF6 in ethylene carbonate–diethyl carbonate solution and cycled between 1 and 3 V under ambient conditions. The Li-HEC delivered maximum specific energy and power densities of 23 W h kg−1 and 4 kW kg−1, respectively.

Graphical abstract: High power lithium-ion hybrid electrochemical capacitors using spinel LiCrTiO4 as insertion electrode

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Publication details

The article was received on 11 May 2012, accepted on 19 Jun 2012 and first published on 20 Jun 2012


Article type: Paper
DOI: 10.1039/C2JM32970K
Citation: J. Mater. Chem., 2012,22, 16026-16031
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    High power lithium-ion hybrid electrochemical capacitors using spinel LiCrTiO4 as insertion electrode

    V. Aravindan, W. Chuiling and S. Madhavi, J. Mater. Chem., 2012, 22, 16026
    DOI: 10.1039/C2JM32970K

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