科研之友
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摘要
This work introduces a simple microwave method for the preparation of alpha-Fe2O3 nanoparticles with two different sizes. Both the materials were characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy and Brunauer-Emmett-Teller methods. The lithium storage properties were evaluated and compared in terms of their reversible capacity, rate capability and cycling performance. Interestingly, the electrode made of large particles (200-300 nm) show the reversible capacity of 1012 mA h g(-1), better rate capability and excellent cycling stability than those of the small particles (20-30 nm). The poor electrochemical performances of small particles can be ascribed to their agglomeration during repeated charging and discharge process. The agglomeration of small particles may substantially decrease the surface area, which results in the lack of sufficient electro active sites for electrochemical reaction.
- 出版日期2015-11-5
