Facile synthesis of CuO hollow nanospheres assembled by nanoparticles and their electrochemical performance

被引:40
作者
Kong, Mei [1 ]
Zhang, Weixin [1 ]
Yang, Zeheng [1 ]
Weng, Shaoying [1 ]
Chen, Zhangxian [1 ]
机构
[1] Hefei Univ Technol, Anhui Key Lab Controllable Chem React & Mat Chem, Sch Chem Engn, Hefei 230009, Peoples R China
基金
中国国家自然科学基金;
关键词
CuO; Hollow nanospheres; Synthesis; Kirkendall effect; Lithium ion batteries; HYDROTHERMAL SYNTHESIS; ANODE MATERIALS; ION BATTERY; LITHIUM; CU2O; MICROSPHERES; MECHANISM; SPHERES; NANOCRYSTALLINE; NANOSTRUCTURES;
D O I
10.1016/j.apsusc.2011.08.127
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
CuO hollow nanospheres with an average diameter of 400 nm and shell thickness of 40 nm have been successfully synthesized via a simple thermal oxidation strategy with Cu(2)O solid nanospheres as the precursor. The products have been characterized by X-ray diffraction, transmission electron microscopy and field emission scanning electron microscopy. The formation of CuO hollow nanospheres mainly results from the Kirkendall effect on the basis of temperature-dependent experiments. Furthermore, the electrochemical performance of CuO hollow nanospheres as anode materials for lithium ion batteries has been evaluated by cyclic voltammetry and galvanostatic discharge-charge experiments. The as-prepared CuO hollow nanospheres assembled by nanoparticles exhibit higher initial discharge capacity and better cycle performance than the reported CuO nanoparticles. The hierarchical hollow nanospheres have been demonstrated to take the advantages of nanoparticles and hollow architectures, which could not only shorten the lithium ion transport distance and increase the kinetics of conversion reactions, but also provide suitable electrode/electrolyte contact area and accommodate the volume change associated with lithium ion insertion and extraction. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:1317 / 1321
页数:5
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