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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 30, Number 10
BKCSDE 30(10)
October 20, 2009 

Improved Cycle Performance of Sulfur-Doped LiFePO4 Material at High Temperatures
Seung Byung Lee, Seung Hyun Cho, Vanchiappan Aravindan, Hyun Soo Kim, Yun Sung Lee*
LiFePO4, Sulfur ion doping, Cathode material, Sol-gel, High temperature
Pristine and sulfur-doped (LiFePO3.98S0.03) 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/LiFePO4 or LiFePO3.98S0.03 cells were employed for cycling studies at various temperatures (25, 50 and 60 oC). In all cases, the Li/LiFePO3.98S0.03 cell showed an improved performance with a stable discharge behavior of ~155 mAhg-1. Nevertheless, pristine LiFePO4 cells presented poor discharge behavior at elevated temperatures, especially 60 oC.
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