Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Improved Cycle Performance of Sulfur-Doped LiFePO4 Material at High Temperatures

  • Lee, Seung-Byung (Faculty of Applied Chemical Engineering, Center for Functional Nano Fine Chemicals, Chonnam National University) ;
  • Cho, Seung-Hyun (Faculty of Applied Chemical Engineering, Center for Functional Nano Fine Chemicals, Chonnam National University) ;
  • Aravindan, Vanchiappan (Faculty of Applied Chemical Engineering, Center for Functional Nano Fine Chemicals, Chonnam National University) ;
  • Kim, Hyun-Soo (Faculty of Applied Chemical Engineering, Center for Functional Nano Fine Chemicals, Chonnam National University) ;
  • Lee, Yun-Sung (Faculty of Applied Chemical Engineering, Center for Functional Nano Fine Chemicals, Chonnam National University)
  • Published : 2009.10.20
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Abstract

Pristine and sulfur-doped (LiFe$PO_{3.98}S_{0.03}$) lithium iron phosphates were synthesized by a sol-gel method. The XRD pattern of the prepared materials suggested an orthorhombic structure with a Pnma space group and an absence of impurities. The Li/LiFe$PO_4$ or LiFe$PO_{3.98}S_{0.03}$ cells were employed for cycling studies at various temperatures (25, 50 and $60\;{^{\circ}C}$). In all cases, the Li/LiFe$PO_{3.98}S_{0.03}$ cell showed an improved performance with a stable discharge behavior of ~155 mA$hg^{-1}$. Nevertheless, pristine LiFeP$O_4$ cells presented poor discharge behavior at elevated temperatures, especially $60\;{^{\circ}C}$.

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