Porous Nb4N5/rGO Nanocomposite for Ultrahigh-Energy-Density Lithium-Ion Hybrid Capacitor
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AbstractTo 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.
All Author(s) ListLi SY, Wang T, Huang YP, Wei ZX, Li GC, Ng DHL, Lian JB, Qiu JX, Zhao Y, Zhang XY, Ma JM, Li HM
Journal nameACS Applied Materials and Interfaces
Volume Number11
Issue Number27
PublisherAmerican Chemical Society
Pages24114 - 24121
LanguagesEnglish-United Kingdom
KeywordsNb4N5/rGO nanocomposite, porous structure, ultrahigh energy/power densities, lithium-ion capacitor, energy storage
Web of Science Subject CategoriesNanoscience & Nanotechnology;Materials Science, Multidisciplinary;Science & Technology - Other Topics;Materials Science

Last updated on 2020-28-03 at 02:42