Hierarchical porous cobalt oxide array films prepared by electrodeposition through polystyrene sphere template and their applications for lithium ion batteries

• Published in: Journal of power sources Vol. 195; no. 7; pp. 2014 - 2022
• Main Authors: Xia, X.H., Tu, J.P., Xiang, J.Y., Huang, X.H., Wang, X.L., Zhao, X.B.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 02.04.2010; Elsevier
• Subjects: Applied sciences; Cobalt oxide; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology; Lithium ion batteries; Polystyrene sphere template; Porous film; Cobalt oxide; Lithium ion batteries; Polystyrene sphere template; Porous film; Lithium battery; Electrodeposition; Styrene polymer; Porous material
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2009.11.009

Hierarchical porous cobalt oxide (Co 3O 4) array films are successfully prepared by electrodeposition through polystyrene sphere monolayer template. The as-prepared Co 3O 4 array films exhibit three typical porous structures from non-close-packed bowl array to close-packed bowl array and hierarchical two layer array structures. These Co 3O 4 array films have a hierarchical porous structure, in which the skeleton is composed of ordered arrays possessing nanoporous walls. A possible growth mechanism of porous Co 3O 4 array films is proposed. As anodes for Li ion batteries, the as-prepared Co 3O 4 array films exhibit quite good cycle life and high capacity. The first discharge capacity for the three Co 3O 4 array films is 1511, 1475, 1463 mAh g −1, respectively, and their initial coulombic efficiencies are as high as 72%. The specific capacity after 50 cycles for the three electrodes is 712, 665 and 640 mAh g −1 at 1 C rate, corresponding to 80%, 75%, 72% of the theoretical value (890 mAh g −1), respectively.