Lookup NU author(s): Dr Stevin Pramana
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ZnMn<inf>2</inf>O<inf>4</inf> structures of various morphologies (nanorods, nanofibers, nanowebs) have been prepared via a facile electrospinning technique by a simple variation of the sintering profile, and have subsequently been employed as anodes in lithium ion battery applications. After the sintering process, as-spun nanofibers with high aspect ratio have broken into short segments of ZnMn<inf>2</inf>O<inf>4</inf> nanorods (ZMO-NR). Incorporating an intermediate carbonization step has strengthened the mechanical integrity of as-spun nanofibers, resulting in the formation of sintered nanofibers (ZMO-NF) and nanowebs (ZMO-NW). On the basis of FESEM, HRTEM and XRD studies, the formation mechanism of nanostructures consisting of hierarchically self-assembled ZnMn<inf>2</inf>O<inf>4</inf> nanocrystals is discussed. Particle size distribution is computed by Rietveld refinement and HRTEM micrographs, while the valence states are confirmed by XPS. The initial discharge of ZMO-NF and ZMO-NW demonstrated a high capacity of ∼1469 mA h g<sup>-1</sup> and 1526 mA h g<sup>-1</sup>, respectively, in the voltage ranges of 0.005 V and 3.0 V versus Li/Li<sup>+</sup> at 60 mA g<sup>-1</sup>, associated with reversible capacities of ∼705 mA h g<sup>-1</sup> and 530 mA h g<sup>-1</sup> after 50 cycles. Morphology tuning of anodes and the importance of interconnected nanoparticulate pathways for lithium ion diffusion are elucidated. © 2013 The Royal Society of Chemistry.
Author(s): Teh PF, Sharma Y, Ko YW, Pramana SS, Srinivasan M
Publication type: Article
Publication status: Published
Journal: RSC Advances
Print publication date: 28/02/2013
Online publication date: 14/12/2012
ISSN (print): 2046-2069
Publisher: Royal Society of Chemistry
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