Journal of Electrochemical Science and Technology

  • 제4권3호
  • /
  • Pages.102-107
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  • 2013
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  • 2093-8551(pISSN)
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  • 2288-9221(eISSN)
한국전기화학회 (The Korean Electrochemical Society)
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Structural and Electrochemical Properties of Doped LiFe0.48Mn0.48Mg0.04PO4 as Cathode Material for Lithium ion Batteries

  • Jang, Donghyuk (Department of Energy Science, Sungkyunkwan University) ;
  • Palanisamy, Kowsalya (Department of Energy Science, Sungkyunkwan University) ;
  • Kim, Yunok (Department of Energy Science, Sungkyunkwan University) ;
  • Yoon, Won-Sub (Department of Energy Science, Sungkyunkwan University)
  • 투고 : 2013.09.07
  • 심사 : 2013.10.04
  • 발행 : 2013.09.30
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초록

The electrochemical properties of Mg-doped $LiFe_{0.48}Mn_{0.48}Mg_{0.04}PO_4$ and pure $LiFe_{0.5}Mn_{0.5}PO_4$ olivine cathodes are examined and the lattice parameters are refined by Rietveld analysis. The calculated atomic parameters from the refinement show that $Mg^{2+}$ doping has a significant effect in the olivine $LiFeMnPO_4$ structure. The unit cell volume is 297.053(2) ${\AA}^3$ for pure $LiFe_{0.5}Mn_{0.5}PO_4$ and is decreased to 296.177(1) ${\AA}^3$ for Mg-doped $LiFe_{0.48}Mn_{0.48}Mg_{0.04}PO_4$ sample. The doping of $Mg^{2+}$ cation with atomic radius smaller than $Mn^{2+}$ and $Fe^{2+}$ ion induces longer Li-O bond length in $LiO_6$ octahedra of the olivine structure. The larger interstitial sites in $LiO_6$ octahedra facilitate the lithium ion migration and also enhance the diffusion kinetics of olivine cathode material. The $LiFe_{0.48}Mn_{0.48}Mg_{0.04}PO_4$ sample with larger Li-O bond length delivers higher discharge capacities and also notably increases the rate capability of the electrode.

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  4. Morphology Effect on Enhanced Li+-Ion Storage Performance for Ni2+/3+and/or Co2+/3+Doped LiMnPO4Cathode Nanoparticles vol.2015, 2015, https://doi.org/10.1155/2015/970856