Controlled synthesis of SnO2@carbon core-shell nanochains as high-performance anodes for lithium-ion batteries

被引:72
|
作者
Yu, Xiaoyuan [1 ]
Yang, Siyuan [1 ]
Zhang, Baohua [1 ,2 ]
Shao, Dan [1 ]
Dong, Xianming [1 ]
Fang, Yueping [1 ,2 ]
Li, Zesheng [2 ]
Wang, Hongqiang [2 ]
机构
[1] S China Agr Univ, Inst Biomat, Coll Sci, Guangzhou 510642, Guangdong, Peoples R China
[2] Guangxi Normal Univ, Key Lab Chem & Mol Engn Med Resources, Minist Educ China, Sch Chem & Chem Engn, Guilin 541004, Peoples R China
关键词
ONE-POT SYNTHESIS; ELECTROCHEMICAL PERFORMANCE; SNO2; NANOPARTICLES; STORAGE; COMPOSITE; NANOSTRUCTURES; NANOWIRES; ELECTRODE; BEHAVIOR; SPHERES;
D O I
10.1039/c1jm11364j
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:12295 / 12302
页数:8
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