期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 2, 期 19, 页码 6790-6795出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta15420c
关键词
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资金
- Key Project of Anhui Provincial Education Department [KJ2013A029]
- National Natural Science Foundation of China [21071002, 21275006, 1208085MB18]
- 211 project of Anhui University
In this work, novel CeCO3OH@C nanocomposites were prepared via a one-pot approach by hydrothermal carbonization of a solution of glucose as a carbon precursor in the presence of Ce(NO3)(3)center dot 6H(2)O and urea. It was found that glucose not only facilitates the formation of CeCO3OH nanoparticles, but also leads to a uniform, glucose-derived, carbon-rich polysaccharide (GCP) overlayer on the CeCO3OH nanocomposites. By adjusting the concentrations of glucose, the morphology of the samples was transformed from spindle nanoparticles to uniform spherical particles. CeO2@C with a core-shell structure was fabricated after calcining the CeCO3OH@C nanospheres under an N-2 atmosphere. The obtained products were characterized by SEM, TEM, XRD, TG-DSC, FT-IR and charge-discharge test. The electrochemical performance test showed that these CeO2@C core-shell spheres as an anode material for lithium ion batteries exhibited an initial discharge specific capacity of 863.0 mA h g(-1) in the potential range of 3.0-0.0 V. After 50 cycles, the capacity of the CeO2@C core-shell spheres was stabilized reversibly at about 355.0 mA h g(-1). The improved cycling performance was attributed to the carbon shells, which can enhance the conductivity of the CeO2 core and suppress the aggregation of active particles during cycling. These CeO2@C core-shell spheres are promising anode materials for lithium ion batteries.
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