Highly porous reticular tin-cobalt oxide composite thin film anodes for lithium ion batteries

被引:84
作者
Zhu, Xian Jun [1 ,2 ]
Guo, Zai Ping [1 ,3 ]
Zhang, Peng [1 ]
Du, Guo Dong [1 ]
Zeng, Rong [1 ]
Chen, Zhi Xin [3 ]
Li, Sean [4 ]
Liu, Hua Kun [1 ]
机构
[1] Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia
[2] Cent China Normal Univ, Coll Chem, Wuhan 430079, Hubei, Peoples R China
[3] Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2522, Australia
[4] Univ New S Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia
基金
澳大利亚研究理事会;
关键词
SPRAY DEPOSITION TECHNIQUE; ELECTROCHEMICAL PROPERTIES; SURFACE-CHEMISTRY; AMORPHOUS OXIDE; CERAMIC FILMS; HIGH-CAPACITY; REACTIVITY; CATHODES; SNO2; PERFORMANCE;
D O I
10.1039/b913993a
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 tin-cobalt oxide film with a 3-dimensional (3D) reticular structure has been prepared by electrostatic spray deposition (ESD). X-Ray diffraction (XRD) and transmission electron microscopy (TEM) make it clear that the film is amorphous. X-Ray photoemission spectroscopy (XPS) indicates that the 3D grid is composed of SnO2 and CoO. As an anode for the lithium ion battery, the film has 1240.2 mAh/g of initial discharge capacity, shows a gradually increasing capacity after the first cycle, and has 845 mAh/g of discharge capacity up to the 50(th) cycle. The high porosity of the 3D reticular structure can provide more reaction sites on the electrode surface and accommodate volume variation of Sn particles during Li alloying-dealloying. The CoO in the complex composite film plays an important role, allowing the formation of a polymeric gel-like film to improve its electrochemical performance, preventing Sn aggregation during charging and discharging. Such a composite film can be used as an anode for lithium ion batteries with higher energy densities.
引用
收藏
页码:8360 / 8365
页数:6
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