Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 21, Issue 33, Pages 12295-12302Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm11364j
Keywords
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Funding
- South China Agricultural University
- NSF of China [20963002, 51064004]
- Ministry of Education [208108]
- Guangdong Natural Science Foundation [9151064201000039]
- Science and Technology Planning Project of Guangdong Province [2009B010900025]
- Guangxi Natural Science Foundation [0832099]
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A new low-flow-rate inert atmosphere strategy has been demonstrated for the synthesis of perfect SnO2@carbon core-shell nanochains (SCNCs) by carbonization of an SnO2@carbonaceous polysaccharide (CPS) precursor at a relatively high temperature. This strategy results in the thorough carbonization of CPS whilst avoiding the carbothermal reduction of SnO2 at 700 degrees C. It has been investigated that a moderate carbon content contributes to the 1-D growth of SCNCs, and the thickness of the carbon shell can be easily manipulated by varying the hydrothermal treatment time in the precursor process. Such a unique nanochain architecture could afford a very high lithium storage capacity as well as resulting in a desirable cycling performance. SCNCs with about 8 nm carbon shell synthesized by optimized routes were demonstrated for optimal electrochemical performances. More than 760 mAh g(-1) of reversible discharge capacity was achieved at a current density of 300 mA g(-1), and above 85% retention can be obtained after 100 charge-discharge cycles. TEM analysis of electrochemically-cycled electrodes indicates that the structural integrity of the SnO2@carbon core-shell nanostructure is retained during electrochemical cycling, contributing to the good cycleability demonstrated by the robust carbon shell.
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