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Issue 8, 2013
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A SnO2@carbon nanocluster anode material with superior cyclability and rate capability for lithium-ion batteries

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Abstract

A nanocluster composite assembled by interconnected ultrafine SnO2–C core–shell (SnO2@C) nanospheres is successfully synthesized via a simple one-pot hydrothermal method and subsequent carbonization. As an anode material for lithium-ion batteries, the thus-obtained nano-construction can provide a three-dimensional transport access for fast transfer of electrons and lithium ions. With the mixture of sodium carboxyl methyl cellulose and styrene butadiene rubber as a binder, the SnO2@C nanocluster anode exhibits superior cycling stability and rate capability due to a stable electrode structure. Discharge capacity reaches as high as 1215 mA h g−1 after 200 cycles at a current density of 100 mA g−1. Even at 1600 mA g−1, the capacity is still 520 mA h g−1 and can be recovered up to 1232 mA h g−1 if the current density is turned back to 100 mA g−1. The superior performance can be ascribed to the unique core–shell structure. The ultrafine SnO2 core gives a high reactive activity and accommodates volume change during cycling; while the thin carbon shell improves electronic conductivity, suppresses particle aggregation, supplies a continuous interface for electrochemical reaction and alleviates mechanical stress from repeated lithiation of SnO2.

Graphical abstract: A SnO2@carbon nanocluster anode material with superior cyclability and rate capability for lithium-ion batteries

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Supplementary files

Article information


Submitted
17 Dec 2012
Accepted
15 Feb 2013
First published
18 Feb 2013

Nanoscale, 2013,5, 3298-3305
Article type
Paper

A SnO2@carbon nanocluster anode material with superior cyclability and rate capability for lithium-ion batteries

M. He, L. Yuan, X. Hu, W. Zhang, J. Shu and Y. Huang, Nanoscale, 2013, 5, 3298 DOI: 10.1039/C3NR34133J

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