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Issue 7, 2016
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Synthesis of a porous sheet-like V2O5–CNT nanocomposite using an ice-templating ‘bricks-and-mortar’ assembly approach as a high-capacity, long cyclelife cathode material for lithium-ion batteries

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Abstract

Tailoring the nanostructures of electrode materials is an effective way to enhance their electrochemical performance for energy storage. Herein, an ice-templating “bricks-and-mortar” assembly approach is reported to make ribbon-like V2O5 nanoparticles and CNTs integrated into a two-dimensional (2D) porous sheet-like V2O5–CNT nanocomposite. The obtained sheet-like V2O5–CNT nanocomposite possesses unique structural characteristics, including a hierarchical porous structure, 2D morphology, large specific surface area and internal conducting networks, which lead to superior electrochemical performances in terms of long-term cyclability and significantly enhanced rate capability when used as a cathode material for LIBs. The sheet-like V2O5–CNT nanocomposite can charge/discharge at high rates of 5C, 10C and 20C, with discharge capacities of approximately 240 mA h g−1, 180 mA h g−1, and 160 mA h g−1, respectively. It also retains 71% of the initial discharge capacity after 300 cycles at a high rate of 5C, with only 0.097% capacity loss per cycle. The rate capability and cycling performance of the sheet-like V2O5–CNT nanocomposite are significantly better than those of commercial V2O5 and most of the reported V2O5 nanocomposite.

Graphical abstract: Synthesis of a porous sheet-like V2O5–CNT nanocomposite using an ice-templating ‘bricks-and-mortar’ assembly approach as a high-capacity, long cyclelife cathode material for lithium-ion batteries

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Supplementary files

Article information


Submitted
19 Dec 2015
Accepted
18 Jan 2016
First published
18 Jan 2016

J. Mater. Chem. A, 2016,4, 2729-2737
Article type
Paper

Synthesis of a porous sheet-like V2O5–CNT nanocomposite using an ice-templating ‘bricks-and-mortar’ assembly approach as a high-capacity, long cyclelife cathode material for lithium-ion batteries

J. Cheng, G. Gu, Q. Guan, J. M. Razal, Z. Wang, X. Li and B. Wang, J. Mater. Chem. A, 2016, 4, 2729
DOI: 10.1039/C5TA10414A

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