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Enhanced electrochemical properties of LiFePO4 by Mo-substitution and graphitic carbon-coating via a facile and fast microwave-assisted solid-state reaction

Journal Article


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Abstract


  • A composite cathode material for lithium ion battery applications, Mo-doped LiFePO4/C, is obtained through a facile and fast microwave-assisted synthesis method. Rietveld analysis of LiFePO4-based structural models using synchrotron X-ray diffraction data shows that Mo-ions substitute onto the Fe sites and displace Fe-ions to the Li sites. Supervalent Mo6+ doping can act to introduce Li ion vacancies due to the charge compensation effect and therefore facilitate lithium ion diffusion during charging/discharging. Transmission electron microscope images demonstrate that the pure and doped LiFePO4 nanoparticles were uniformly covered by an approximately 5 nm thin layer of graphitic carbon. Amorphous carbon on the graphitic carbon-coated pure and doped LiFePO4 particles forms a three-dimensional (3D) conductive carbon network, effectively improving the conductivity of these materials. The combined effects of Mo-doping and the 3D carbon network dramatically enhance the electrochemical performance of these LiFePO4 cathodes. In particular, Mo-doped LiFePO4/C delivers a reversible capacity of 162 mA h g(-1) at a current of 0.5 C and shows enhanced capacity retention compared to that of undoped LiFePO4/C. Moreover, the electrode exhibits excellent rate capability, with an associated high discharge capacity and good electrochemical reversibility.

Authors


  •   Li, Dan (external author)
  •   Haung, Yudai (external author)
  •   Sharma, Neeraj (external author)
  •   Chen, Zhixin
  •   Jia, Dianzeng (external author)
  •   Guo, Zaiping

Publication Date


  • 2012

Citation


  • Li, D., Huang, Y., Sharma, N., Chen, Z., Jia, D. & Guo, Z. (2012). Enhanced electrochemical properties of LiFePO4 by Mo-substitution and graphitic carbon-coating via a facile and fast microwave-assisted solid-state reaction. Physical Chemistry Chemical Physics, 14 (10), 3634-3639.

Scopus Eid


  • 2-s2.0-84861548214

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=8161&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/5229

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 3634

End Page


  • 3639

Volume


  • 14

Issue


  • 10

Place Of Publication


  • United Kingdom

Abstract


  • A composite cathode material for lithium ion battery applications, Mo-doped LiFePO4/C, is obtained through a facile and fast microwave-assisted synthesis method. Rietveld analysis of LiFePO4-based structural models using synchrotron X-ray diffraction data shows that Mo-ions substitute onto the Fe sites and displace Fe-ions to the Li sites. Supervalent Mo6+ doping can act to introduce Li ion vacancies due to the charge compensation effect and therefore facilitate lithium ion diffusion during charging/discharging. Transmission electron microscope images demonstrate that the pure and doped LiFePO4 nanoparticles were uniformly covered by an approximately 5 nm thin layer of graphitic carbon. Amorphous carbon on the graphitic carbon-coated pure and doped LiFePO4 particles forms a three-dimensional (3D) conductive carbon network, effectively improving the conductivity of these materials. The combined effects of Mo-doping and the 3D carbon network dramatically enhance the electrochemical performance of these LiFePO4 cathodes. In particular, Mo-doped LiFePO4/C delivers a reversible capacity of 162 mA h g(-1) at a current of 0.5 C and shows enhanced capacity retention compared to that of undoped LiFePO4/C. Moreover, the electrode exhibits excellent rate capability, with an associated high discharge capacity and good electrochemical reversibility.

Authors


  •   Li, Dan (external author)
  •   Haung, Yudai (external author)
  •   Sharma, Neeraj (external author)
  •   Chen, Zhixin
  •   Jia, Dianzeng (external author)
  •   Guo, Zaiping

Publication Date


  • 2012

Citation


  • Li, D., Huang, Y., Sharma, N., Chen, Z., Jia, D. & Guo, Z. (2012). Enhanced electrochemical properties of LiFePO4 by Mo-substitution and graphitic carbon-coating via a facile and fast microwave-assisted solid-state reaction. Physical Chemistry Chemical Physics, 14 (10), 3634-3639.

Scopus Eid


  • 2-s2.0-84861548214

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=8161&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/5229

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 3634

End Page


  • 3639

Volume


  • 14

Issue


  • 10

Place Of Publication


  • United Kingdom