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http://dx.doi.org/10.5012/bkcs.2009.30.10.2223

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)
Publication Information
Bulletin of the Korean Chemical Society / v.30, no.10, 2009 , pp. 2223-2226 More about this Journal
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 $60\;{^{\circ}C}$.
Keywords
$LiFePO_{4}$; Sulfur ion doping; Cathode material; Sol-gel High temperature;
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