4.6 Article

Synthesis and the comparative lithium storage properties of hematite: hollow structures vs. carbon composites

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RSC ADVANCES
卷 5, 期 27, 页码 21405-21414

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ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra16091f

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  1. Fundamental Research Funds for the Central Universities [2013XK07]

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In the present work, alpha-Fe2O3 hollow structures from nanotubes to nanorings, and alpha-Fe2O3/carbon composites composed of nanoparticles homogeneously dispersed on graphene sheets and carbon nanotubes were synthesized via self-assembly combined with a facile hydrothermal method, and their structure, morphology and electrochemical performance were characterized by XRD, XPS, SEM, TEM, CV, charge-discharge tests and EIS. The focus is elucidating how structural aspects, such as particle size and shape of the nanoparticles as well as the carbon matrix, influence the electrochemical properties of the alpha-Fe2O3 nanoparticles. The results revealed that the cycling performance of hollow structured alpha-Fe2O3 improves with the increase of aspect ratio, namely, the alpha-Fe2O3 nanotubes exhibit the best electrochemical performance in terms of reversible capacity, capacity retention and rate performance, which is comparable to that of alpha-Fe2O3 nanoparticle-carbon composites. It is expected that the synthesis of alpha-Fe2O3 nanotubes with high aspect ratio anchored on conducting graphene would be a potential anode material for high performance LIBs.

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