期刊
JOURNAL OF APPLIED ELECTROCHEMISTRY
卷 37, 期 5, 页码 567-573出版社
SPRINGER
DOI: 10.1007/s10800-006-9286-9
关键词
carbon coated Cu6Sn5 alloy-graphite composite anode; lithium battery; specific capacity; coulombic efficiency
With a view to minimize the unavoidable large volume changes of tin based Cu6Sn5 alloy anodes, a composite Cu6Sn5/graphite anode has been prepared via. a mechanical alloying process and subsequently coated with disordered carbon through pyrolysis of PVC. Phase pure products with better crystallinity and preferred surface morphology were obtained, as evident from PXRD and SEM respectively. Upon electrochemical charge-discharge, the intermetallic Cu6Sn5 alloy-graphite composite anode was found to exhibit an enhanced initial discharge capacity of 564 mAh g(-1) followed by significant capacity fade (> 20%) especially after five cycles. On the other hand, carbon coated Cu6Sn5 alloy-graphite composite demonstrated promising electrochemical properties such as steady reversible capacity (similar to 200 mAh g(-1)), excellent cycle performance (< 5% capacity fade) and high coulombic efficiency (similar to 98%) via. significant reduction of volume changes. The carbon coating offers buffering and conductive actions on the anode active material and thereby enhances the electrochemical behavior of carbon coated Cu6Sn5 alloy/graphite composite anode material.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据