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Issue 37, 2017
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High energy Li-ion capacitors using two-dimensional TiSe0.6S1.4 as insertion host

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Abstract

A remarkable improvement in energy density was found using Se-substituted two-dimensional TiS2 (TiSe0.6S1.4) as the insertion matrix in a Li-ion capacitor (LIC) assembly with activated carbon (AC) as the counter electrode. Chemical vapor transport was successfully used to synthesize high quality TiSe0.6S1.4 with near-100% crystallinity and subsequently employed as a battery component in LICs. Prior to LIC fabrication, the Li-insertion properties were assessed in single-electrode configuration with metallic Li. Single-electrode performance is crucial for adjusting the mass loading of AC and TiSe0.6S1.4 to realize the maximum energy density. Accordingly, an AC/TiSe0.6S1.4-based LIC delivered an energy density of ∼50 W h kg−1 with a good cyclability of 5000 cycles. Few undesirable side reactions with the electrolyte counterpart were observed for TiSe0.6S1.4, as supported by the impedance measurements.

Graphical abstract: High energy Li-ion capacitors using two-dimensional TiSe0.6S1.4 as insertion host

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Publication details

The article was received on 22 May 2017, accepted on 29 Aug 2017 and first published on 29 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA04470D
Citation: J. Mater. Chem. A, 2017,5, 19819-19825
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    High energy Li-ion capacitors using two-dimensional TiSe0.6S1.4 as insertion host

    A. Chaturvedi, P. Hu, C. Kloc, Y. Lee, V. Aravindan and S. Madhavi, J. Mater. Chem. A, 2017, 5, 19819
    DOI: 10.1039/C7TA04470D

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