Hydrothermal synthesis of Î±-MnO2 and Î²-MnO2 nanorods as high capacity cathode materials for sodium ion batteries
- RSC Publishing
- Publication Type:
- Journal Article
- Journal of Materials Chemistry A, 2013, 1 pp. 4845 - 4850
- Issue Date:
Two types of MnO2 polymorphs, Î±-MnO2 and Î²-MnO2 nanorods, have been synthesized by a hydrothermal method. Their crystallographic phases, morphologies, and crystal structures were characterized by XRD, FESEM and TEM analysis. Different exposed crystal planes have been identified by TEM. The electrochemical properties of Î±-MnO2 and Î²-MnO2 nanorods as cathode materials in Na-ion batteries were evaluated by galvanostatic charge/discharge testing. Both Î±-MnO2 and Î²-MnO2 nanorods achieved high initial sodium ion storage capacities of 278 mA h gâ1 and 298 mA h gâ1, respectively. Î²-MnO2 nanorods exhibited a better electrochemical performance such as good rate capability and cyclability than that of Î±-MnO2 nanorods, which could be ascribed to a more compact tunnel structure of Î²-MnO2 nanorods. Furthermore, the one-dimensional architecture of nanorods could also contribute to facile sodium ion diffusion in the charge and discharge process.
Please use this identifier to cite or link to this item: