期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 2, 期 44, 页码 18761-18766出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta03052d
关键词
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资金
- National Natural Science Foundation of China [21207073]
- ARC Discovery Project [130104759]
- Youth 1000 Talent Plan Fund
- State Key Lab of Multiphase Flow in Power Engineering
Cobalt tetroxide (Co3O4) has attracted much attention as a promising anode material for rechargeable lithium-ion batteries (LIBs) owing to its high theoretical capacity (890 mA h g(-1)). However, its poor electronic conductivity and weak ability to accommodate large volume changes during a repeated charging-discharging process, which results in the poor cycling performance, have hindered the practical application of Co3O4. In this article, Co3O4/C fibres were prepared by simple pyrolysis of wetspun cobalt alginate fibres. The composites were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), and high-resolution transmission electron microscopy (HRTEM). It was found that the resulting material possesses a unique hierarchical nano/microstructure in which Co3O4 nanoparticles (NPs) are capsulated in a micro-sized carbonaceous fibrous matrix. This nano/microstructure can combine the merits of the Co3O4 nanostructure and the carbonaceous microfibre matrix, and thus exhibits a high reversible capacity of 780 mA h g(-1) at 89 mA g(-1) after 100 cycles as well as excellent cycling stability and rate performance when used as an anode material. This finding could open up a new direction in sustainable use of natural seaweed resources as new energy storage materials.
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