期刊
NANOSCALE
卷 5, 期 24, 页码 12342-12349出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3nr03931e
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资金
- National Science Foundation (NSF) [CMMI-1030048]
- NESAC/BIO [EB-002027]
- University of Washington TGIF grant
- National Natural Science Foundation of China [61376073, 21103046]
- Hunan Provincial Natural Science Foundation of China [10JJ1011, 11JJ7004]
- China Scholarship Council
- Fundamental Research Funds for the Central Universities
CoOx-carbon nanofiber networks were prepared from cobalt(II) acetate and polyacrylonitrile by an electrospinning method followed by thermal treatment. The XPS results demonstrated that the cobalt compound in CoOx-carbon obtained at 650 degrees C was CoO rather than Co or Co3O4. The CoO nanoparticles with diameters of about 8 nm were homogeneously distributed in the matrix of the nanofibers with diameters of 200 nm. As binder-free anodes for lithium-ion batteries, the discharge capacities of such CoO-carbon (CoO-C) composite nanofiber networks increased with the pyrolysis and annealing temperature, and the highest value was 633 mA h g(-1) after 52 cycles at a current density of 0.1 A g(-1) when the CoO-C was obtained at 650 degrees C. In addition, the rate capacities of the CoO-C obtained at 650 degrees C were found to be higher than that of the sample annealed at a lower temperature and pure carbon nanofiber networks annealed at 650 degrees C. The improved properties of CoO-C nanofiber networks were ascribed to nanofibers as the framework to keep the structural stability, and favorable mass and charge transport. The present study may provide a new strategy for the synthesis of binder-free anodes for lithium-ion batteries with excellent properties.
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