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Structural characteristics of olivine Li(Mg0.5Ni0.5)PO4 via TEM analysis

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Abstract

The structural characteristics of olivine-type lithium orthophosphate Li(Mg0.5Ni0.5)PO4 synthesized via solid-state reaction have been studied using X-ray diffraction, ion beam technique, scanning electron microscopy, infrared spectroscopy, transmission electron microscopy and energy dispersive X-ray analysis. The parent LiNiPO4 compound can be synthesized in olivine structure without any evidence of secondary phases as impurities. The structural quality of the parent LiNiPO4 in the absence of secondary component phases resulted in the formation of hexagonal closed packed structure. The olivine analogue compound containing mixed M (M = Mg, Ni) cations, Li(Mg0.5Ni0.5)PO4 contained Li3PO4 as a second phase upon synthesis, however a carbothermal reduction method produced a single-phase compound. The redox behaviour of carbon-coated Li(Mg0.5Ni0.5)PO4 cathode in aqueous lithium hydroxide as the electrolyte showed reversible lithium intercalation.

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Acknowledgements

This research was supported under ARC’s Discovery Projects funding scheme (DP1092543). M.M. would like to thank the Australian Institute of Nuclear Science and Engineering for providing the financial assistance (Award 11133) for access to ion beam, TEM and EDS analyses at ANSTO. The infrared analysis was undertaken in the FRIR beamline at the Australian Synchrotron, VIC, Australia through the grant no. 4065.

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Authors and Affiliations

  1. Faculty of Minerals and Energy, Murdoch University, Murdoch, Perth, WA, 6150, Australia

    Manickam Minakshi, Pritam Singh & David Ralph

  2. Australian Synchrotron Company Ltd., Blackburn Road, Clayton, VIC, 3168, Australia

    Dominique Appadoo

  3. Institute of Materials Engineering, ANSTO, Lucas Heights, NSW, 2234, Australia

    Mark Blackford

  4. Environmental Science, ANSTO, Lucas Heights, NSW, 2234, Australia

    Mihail Ionescu

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  1. Manickam Minakshi
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  2. Pritam Singh
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  3. David Ralph
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  4. Dominique Appadoo
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  5. Mark Blackford
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Correspondence to Manickam Minakshi.

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Minakshi, M., Singh, P., Ralph, D. et al. Structural characteristics of olivine Li(Mg0.5Ni0.5)PO4 via TEM analysis. Ionics 18, 583–590 (2012). https://doi.org/10.1007/s11581-011-0661-0

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  • DOI: https://doi.org/10.1007/s11581-011-0661-0

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