Issue 18, 2014

Combination of a SnO2–C hybrid anode and a tubular mesoporous carbon cathode in a high energy density non-aqueous lithium ion capacitor: preparation and characterisation

Abstract

Lithium ion capacitors (LICs), bridging supercapacitors and lithium ion batteries (LIBs), have recently drawn considerable attention. In this report, a non-aqueous LIC was fabricated using tubular mesoporous carbon as a cathode and a SnO2–C hybrid (ultrafine SnO2 encapsulated in the tubular mesoporous carbon) as an anode. Such a LIC can achieve a maximum energy density of 110 W h kg−1 and a maximum power density of 2960 W kg−1. The capacitance retention is fairly stable and retains 80% of its initial value after 2000 cycles. This unique performance arises because of the highly conductive tubular mesoporous carbon matrix and fast charge/ion diffusion in the SnO2–C hybrid anode. It is shown that the SnO2 loading in the anode has a great influence on the stability of the SnO2 nano-structure and the kinetics of lithium ion transfer. Electrochemical impedance spectroscopy (EIS) was used to evaluate the charge transfer resistance and the ionic diffusion resistance before and after long-term cycling. The diffusion coefficient was also calculated to verify the good rate and cycling capability.

Graphical abstract: Combination of a SnO2–C hybrid anode and a tubular mesoporous carbon cathode in a high energy density non-aqueous lithium ion capacitor: preparation and characterisation

Supplementary files

Article information

Article type
Paper
Submitted
08 Feb 2014
Accepted
17 Feb 2014
First published
17 Feb 2014

J. Mater. Chem. A, 2014,2, 6549-6557

Combination of a SnO2–C hybrid anode and a tubular mesoporous carbon cathode in a high energy density non-aqueous lithium ion capacitor: preparation and characterisation

W. Qu, F. Han, A. Lu, C. Xing, M. Qiao and W. Li, J. Mater. Chem. A, 2014, 2, 6549 DOI: 10.1039/C4TA00670D

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