| Synthesis of One-dimensional Spinel LiMn2O4 Nanostructures as a Positive Electrode in Lithium Ion Battery |
| Hyun-Wook Lee, P. Muralidharan, Do-Kyung Kim |
| Department of Materials Science and Engineering, KAIST |
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| ABSTRACT |
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This paper presents the synthesis of one-dimensional spinel $LiMn_2O_4$ nanostructures using a facile and scalable two-step process. $LiMn_2O_4$ nanorods with average diameter of 100 nm and length of 1.5 ${mu}m$ have been prepared by solid-state lithiation of hydrothermally synthesized ${beta}$-$MnO_2$ nanorods. $LiMn_2O_4$ nanowires with diameter of 10 nm and length of several micrometers have been fabricated via solid-state lithiation of ${beta}$-$MnO_2$ nanowires. The precursors have been lithiated with LiOH and reaction temperature and pressure have been controlled. The complete structural transformation to cubic phase and the maintenance of 1-D nanostructure morphology have been evaluated by XRD, SEM, and TEM analysis. The size distribution of the spinel $LiMn_2O_4$ nanorods/wires has been similar to the $MnO_2$ precursors. By control of reaction pressure, cubic 1-D spinel $LiMn_2O_4$ nanostructures have been fabricated from tetragonal $MnO_2$ precursors even below $500^{circ}C$. |
| Key words:
Energy storage, Lithium ion battery, Lithium manganese oxide, Nanowire, Nanorod |
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