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Electrospun Zn1- xMnxFe2O4 nanofibers as anodes for lithium-ion batteries and the impact of mixed transition metallic oxides on battery performance

Lookup NU author(s): Dr Stevin Pramana

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Abstract

The structural and electrochemical properties of the mixed transition metallic oxides Zn1-xMnxFe2O4 nanofibers, which crystallize in a cubic spinel AFe2O4 structure, are investigated systematically with a gradual substitution of Zn by Mn. The crystal structural information studied by X-ray diffraction (XRD) depicts the formation of single phase spinel structure, while electron-dispersive X-ray spectroscopy (EDS) reveals the stoichiometric ratio between Zn and Mn. ZnFe2O4 exhibits a good capacity of ∼532 mAh g-1 at 50th cycle through the interbeneficial conversion reaction and alloy-dealloy mechanism, with a first discharge working voltage of ∼0.83 V. Subsequently, the characteristic redox potential of each spinel is gradually reduced with the replacement of Mn. Furthermore, Zn 0.3Mn0.7Fe2O4 demonstrates the highest capacity of ∼612 mA h g-1 at 50th cycle among the solid solution series. Ex situ characterization by high-resolution transmission electron microscope (TEM) and electron energy loss spectroscopy (EELS) is conducted to study the participation of Mn in the battery performance. This report represents an example of how the electrochemical performance could be flexibly adjusted by tuning the ratio of transition metals within the spinel. © 2013 American Chemical Society.


Publication metadata

Author(s): Teh PF, Pramana SS, Sharma Y, Ko YW, Madhavi S

Publication type: Article

Publication status: Published

Journal: ACS Applied Materials and Interfaces

Year: 2013

Volume: 5

Issue: 12

Pages: 5461-5467

Print publication date: 26/06/2013

Online publication date: 20/05/2013

ISSN (print): 1944-8244

ISSN (electronic): 1944-8252

Publisher: American Chemical Society

URL: https://doi.org/10.1021/am400497v

DOI: 10.1021/am400497v


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