Journal
NANO ENERGY
Volume 56, Issue -, Pages 118-126Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2018.10.048
Keywords
Li-ion intercalation pseudocapacitance; Orthorhombic niobium oxide; In-situ polymerization; Nitrogen doping
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- University of Waterloo
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Herein, a unique nitrogen-doped T-Nb2O5/tubular carbon hybrid structure in which T-Nb2O5 nanoparticles are homogeneously embedded in an in-situ formed nitrogen-doped microtubular carbon is synthesized, utilizing a facile and innovative synthesis strategy. This structure addresses the poor electron conductivity and rate capability that hinder T-Nb2O5's promise as an anode for Li-ion devices. Such a distinctive structure possesses a robust framework that has ultrasmall active nanocomponents encapsulated in highly conducive carbon scaffold with hollow interior and abundant voids, enabling fast electron/ion transport and electrolyte penetration. Moreover, nitrogen-doping not only ameliorates the electronic conductivity of the heterostructure, but also induces pseudocapacitance mechanism. When evaluated in a half-cell, the as-prepared material delivers a specific capacitance of 370 F g(-1) at 0.1 A g(-1) within 1-3 V vs. Li/Li+ and excellent cyclability over 1100 cycles. A high energy density of 86.6 W h kg(-1) and high power density of 6.09 kW kg(-1) are realized. Additionally, a capacitance retention as high as 81% after 3500 cycles is achieved in an Li-ion Capacitor (LIC) with activated carbon as the cathode and nitrogen-doped T-Nb2O5/tubular carbon as the anode.
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