Coaxial Co3O4@polypyrrole core-shell nanowire arrays for high performance lithium ion batteries. (10th August 2016)

• Record Type: Journal Article
• Authors: Zhan, Liang; Chen, Hongbin; Fang, Junqi; Wang, Suqing; Ding, Liang-Xin; Li, Zhong; Ashman, Peter J.; Wang, Haihui
• Is Part Of: Electrochimica acta. Volume 209(2016)
• Page Start: 192
• Page End: 200
• Publication Date: 2016-08-10
• Subjects: Co3O4 array -- polypyrrole -- core-shell nanowire -- lithium ion batteries; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.05.059
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Highlights: Co3 O4 @PPynanowirearraysaresynthesizedbyatwo-stepmethod(*). Co3 O4 @PPy NWAs exhibit improved rate capability and long cycle life. The enhanced performance is attributed to the conductive PPy coating layer. Abstract: Coaxial Co3 O4 @polypyrrole (Co3 O4 @PPy) nanowire arrays have been successfully synthesized via a simple hydrothermal method and further a polymerization process. According to the composition and morphology characterization, it is found that a thin layer of amorphous PPy is uniformly coated on the surface of the Co3 O4 nanowire. When directly used as an anode material for lithium-ion batteries, the Co3 O4 @PPy nanowire arrays electrode exhibits high reversible capacity, good rate capability, and improved cycling stability. A reversible capacity of 700 mAh g −1 is sustained at the current of 3 A g −1 after 500 cycles, showing better cycling stability than the bare Co3 O4 nanowire arrays (only 150 mAh g −1 at the current of 3 A g −1 after 100 cycles). Even at a high current of 20 A g −1, the Co3 O4 @PPy nanowire arrays can still maintain a capacity of 470 mAh g −1, which is much higher than that of the bare Co3 O4 nanowire arrays (158 mAh g −1 ). The synergetic effect of the arrays structure and the PPy buffer layer contributes to the enhanced electrochemical performance of the Co3 O4 @PPy nanoarrys. As a result, the introduction of conductive polymer coating layer is an effective strategy to enhance the electrochemical performance of nanoarrays structure for advanced energy storage.