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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 30, Number 8
BKCSDE 30(8)
August 20, 2009 

Preparation of LiFePO4 Using Chitosan and its Cathodic Properties for Rechargeable Li-ion Batteries
Kyong Soo Hong, Seong Mi Yu, Myoung Gyu Ha, Chang Won Ahn, Tae Eun Hong, Jong Sung Jin, Hyun Gyu Kim, Euh Duck Jeong*, Yang Soo Kim, Hae Jin Kim, Chil Hoon Doh, Ho Soon Yang, Hee Jung
Carbon coating, Chitosan, LiFePO4, Lithium ion batteries
The LiFePO4 powder was synthesized by using the solid state reaction method with Fe(C2O4)?2H2O, (NH4)2HPO4, Li2CO3, and chitosan as a carbon precursor material for a cathode of a lithium-ion battery. The chitosan added LiFePO4 powder was calcined at 350℃ for 5 hours and then 800℃ for 12 hours for the calcination. Then we calcined again at 800 oC for 12 hours. We characterized the synthesized compounds via the crystallinity, the valence states of iron ions, and their shapes using TGA, XRD, SEM, TEM, and XPS. We found that the synthesized powders were carbon-coated using TEM images and the iron ion is substituted from 3+ to 2+ through XPS measurements. We observed voltage characteristics and initial charge-discharge characteristics according to the C rate in LiFePO4 batteries. The obtained initial specific capacity of the chitosan added LiFePO4 powder is 110 mAh/g, which is much larger than that of LiFePO4 only powder.
1719 - 1723
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