期刊
ELECTROCHIMICA ACTA
卷 52, 期 24, 页码 6650-6655出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2007.04.072
关键词
iron oxide; composite; electrode; lithium battery; gel polymer
Nanosized alpha-Fe2O3 (ca. 50 nm) and Li-Fe composite oxides (ca. 29 nm) powders were synthesized via gel polymer route. The gels were obtained with thermal polymerization of acrylic acid solutions of iron and lithium nitrates. The calcination of these gels at temperatures from 300 degrees C to 500 degrees C results in alpha-Fe2O3 from Fe(NO3)(3) precursor and Li-Fe composite oxides Li2O-Fe3O4-LiFeO2 from a mixed precursors of Fe(NO3)(3) and LiNO3. Thermal gravimetric analysis, X-ray diffraction and transmission electron microscopy were used to investigate the precursors and products. The electrochemical performance of the Fe-based oxides was also evaluated. After 200 cycles, their capacity can be as high as 1300 mAh/g for alpha-Fe2O3 and 1400 mAh/g for Li-Fe oxide while the initial capacity loss is as low as 21.8%. The Li-Fe oxide electrodes exhibit better capacity retention than the alpha-Fe2O3 electrodes. They are interesting negative electrodes for high energy density lithium-ion batteries. (c) 2007 Elsevier Ltd. All rights reserved.
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