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Porous Nb4N5/rGO Nanocomposite for Ultrahigh-Energy-Density Lithium-Ion Hybrid Capacitor

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journal contribution
posted on 19.06.2019, 00:00 by Shengyuan Li, Ting Wang, Yunpeng Huang, Zengxi Wei, Guochun Li, Dickon H. L. Ng, Jiabiao Lian, Jingxia Qiu, Yan Zhao, Xiaoyan Zhang, Jianmin Ma, Huaming Li
To meet the increasing demands for high-performance energy storage devices, an advanced lithium-ion hybrid capacitor (LIHC) has been designed and fabricated, which delivers an ultrahigh energy density of 295.1 Wh kg–1 and a power density of 41 250 W kg–1 with superior cycling stability. The high-performance LIHC device is based on the uniform porous Nb4N5/rGO nanocomposite, which has an intimate interface between the firmly contacted Nb4N5 and rGO through the Nb­(Nb4N5)–O­(rGO)–C­(rGO) bonds, significantly improving the electron transport kinetics. Moreover, the introduction of rGO nanosheets can prevent the Nb4N5 nanoparticles from agglomeration, not only resulting in a larger specific surface area to provide more active sites but also accommodating the strain during Li ion insertion/deinsertion. Therefore, the Nb4N5/rGO nanocomposite exhibits a higher reversible specific capacity and better rate and cycling performance than the Nb4N5 nanoparticle. In view of the scalable preparation and superior electrochemical characteristics, the Nb4N5/rGO nanocomposite would have great potential practical applications in the future energy storage devices.