Intimately mixed nanocomposite of Fe2O3 and Mn 3O4 is synthesized by an electrostatically-derived self-assembly between exfoliated MnO2 nanosheets and Fe cations, which is followed by heat-treatment at elevated temperature. The as-prepared Fe-layered MnO2 nanocomposite experiences phase transformations into Fe-substituted Mn3-xFexO4 nanoparticle at 450 C and Fe2O3-Mn3O4 nanocomposite at 650 C. The Fe2O3-Mn3O4 nanocomposite shows better performance as anode material for lithium ion batteries than the Fe-substituted Mn3-xFexO4 nanoparticle, indicating the beneficial effect of composite formation on the electrode performance of 3d metal oxide. The present finding underscores that a self-assembly between exfoliated metal oxide nanosheets and metal cations can provide useful precursor for efficient composite electrode materials.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government (MEST) ( NRF-2010-C1AAA001-2010-0029065 ) and by the Core Technology of Materials Research and Development Program of the Korea Ministry of Intelligence and Economy (Grant no. 10041232 ). The experiments at PAL were supported in part by MOST and POSTECH .
- Energy storage and conversion
- Phase transformation