Structural and electrochemical properties of micro- and nano-crystalline CoSn electrode materials

被引：29
|
作者：
Alcantara, Ricardo [1 ]
Rodriguez, Ines [1 ]
Tirado, Jose Luis [1 ]
机构：
[1] Univ Cordoba, Lab Quim Inorgan, E-14071 Cordoba, Spain
来源：
CHEMPHYSCHEM | 2008年 / 9卷 / 08期
关键词：
electrochemistry; intermetallic phases; lithium; Mossbauer spectroscopy; nanoparticles;
D O I：
10.1002/cphc.200800031
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：
Nanocrystalline CoSn with on average crystallite size of 19 nm is obtained at 265 degrees C by following a one-pot method. The structural and electrochemical properties of nano-CoSn are compared to those of micro-CoSn (319 nm) obtained at 500 degrees C. Micro-CoSn has specific capacities below 100 mAhg(-1), but very stable cycling behavior. In contrast, nano-CoSn exhibits reversible specific capacities of over ca. 400 mAhg(-1) in the first cycles, depending on the cycling conditions. The crystalline structure of micro-CoSn is preserved after electrochemical reaction with lithium. Nano-CoSn becomes amorphous upon cycling and a modified Sn-119 Mossbauer spectrum corresponding to a LiCoSn nano-alloy is observed.
引用
收藏
页码：1171 / 1177
页数：7
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