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Study on the MoN/Nitrogen-doped Graphene Sheets Composite for Lithium Ion Capacitor Electrode Materials

Author(s): MA Wen, HAN Peng-Xian, KONG Qing Shan, ZHANG Ke Jun, BI Cai Feng, CUI Guang Lei

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 28;
Issue: 7;
Start page: 733;
Date: 2013;
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Keywords: molybdenum nitride; nitrogen-doped graphene sheets; electrode materials; lithium ion capacitor

Molybdenum nitride/nitrogen-doped graphene sheets (MoN/NGS) composite was prepared via a simple hydrothermal method followed by calcination at 800¡æ under ammonia atmosphere. The phase structure and morphology of samples were characterized by XRD and SEM. The electrochemical properties of composite electrodes were studied by performing cyclic voltammetry, galvanostatic charge and discharge, and electrochemical impedance spectroscopy test. The MoN/NGS electrode deliveres specific capacitance of 422 F/g at the current density of 0.05 A/g, and its capacitance retention remains more than 80% after 900 cycles. The energy density remains as high as 32.5 Wh/kg when the power density is 3000 W/kg. It should be noted that such improvement should be attributed not only to the presence of NGS in the composite offering an effective conducting network but also to the hybrid structure of MoN/NGS composite providing a favorable and fast ion transport and diffusion.
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