Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Charge/Discharge Mechanism of Multicomponent Olivine Cathode for Lithium Rechargeable Batteries

  • Park, Young-Uk (Department of Materials Science and Engineering, Seoul National University) ;
  • Shakoor, R.A. (Department of Materials Science and Engineering and KAIST Institute for Eco-Energy, KAIST) ;
  • Park, Kyu-Young (Department of Materials Science and Engineering and KAIST Institute for Eco-Energy, KAIST) ;
  • Kang, Ki-Suk (Department of Materials Science and Engineering, Seoul National University)
  • Received : 2010.12.17
  • Accepted : 2011.02.27
  • Published : 2011.03.31
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Abstract

Quasi-equilibrium profiles are analyzed through galvanostatic intermittent titration technique (GITT) and potentiostatic intermittent titration technique (PITT) to study the charge/discharge mechanism in multicomponent olivine structure ($LiMn_{1/3}Fe_{1/3}Co_{1/3}PO_4$). From GITT data, the degree of polarization is evaluated for the three regions corresponding to the redox couples of $Mn^{2+}/Mn^{3+}$, $Fe^{2+}/Fe^{3+}$ and $Co^{2+}/Co^{3+}$. From PITT data, the current vs. time responses are examined in each titration step to find out the mode of lithium de-intercalation/intercalation process. Furthermore, lithium diffusivities at specific compositions (x in $Li_xMn_{1/3}Fe_{1/3}Co_{1/3}PO_4$) are also calculated. Finally, total capacity ($Q^{total}$) and diffusional capacity ($Q^{diff}$) are obtained for some selected voltage steps. The entire study consistently confirms that the charge/discharge mechanism of multicomponent olivine cathode is associated with a one-phase reaction rather than a biphasic reaction.

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