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Issue 6, 2017
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Highly microporous graphite-like BCxO3−x/C nanospheres for anode materials of lithium-ion batteries

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Abstract

In the present work, we report Li storage in a spherical graphite-like BCxO3−x/C (g-BCO/C) nanostructure with an average diameter of ca. 75 nm. Highly microporous g-BCO/C nanospheres with a BET specific surface area of 493.35 m2 g−1 were fabricated via a simple hydrothermal carbonization process combined with one-step annealing. The microstructure of the g-BCO/C nanospheres was characterized by means of XRD, TEM and Raman spectroscopy. XPS measurements reveal the formation of a boron solid-solution phase such as BC3 (x = 3), BC2O (x = 2) and BCO2 (x = 1), as well as the concentration of substitutional boron which is around 1.75 at.%. Further, 11B-NMR spectra confirmed the formation of BC3. Benefiting from the unique structural features and boron doping, the g-BCO/C nanospheres exhibit excellent electrochemical performances as an anode material for Li-ion batteries. A high initial reversible capacity (591 mA h g−1, 200 mA g−1) and high-rate capacity (262 mA h g−1, 1000 mA g−1), as well as stable capacity (446 mA h g−1, 200 mA g−1) after 100 cycles are delivered. The improved Li storage performance is attributed to three merits of g-BCO/C nanospheres: the large number of edge defects induced by boron, the micropores in the material and the large spacing of the lattice fringes (d002) which can provide extra Li storage regions.

Graphical abstract: Highly microporous graphite-like BCxO3−x/C nanospheres for anode materials of lithium-ion batteries

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Supplementary files

Article information


Submitted
14 Dec 2016
Accepted
09 Jan 2017
First published
09 Jan 2017

J. Mater. Chem. A, 2017,5, 2835-2843
Article type
Paper

Highly microporous graphite-like BCxO3−x/C nanospheres for anode materials of lithium-ion batteries

H. Wang, Y. Li, Y. Wang, S. Hu and H. Hou, J. Mater. Chem. A, 2017, 5, 2835
DOI: 10.1039/C6TA10778H

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