The Origin of the Residual Carbon in LiFePO4 Synthesized by Wet Milling

Authors
Park, Sung BinPark, Chang KyooHwang, Jin TaeCho, Won IlJang, Ho
Issue Date
2011-02-20
Publisher
WILEY-V C H VERLAG GMBH
Citation
BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.32, no.2, pp.536 - 540
Abstract
This study reports the origin of the electrochemical improvement of LiFePO4 when synthesized by wet milling using acetone without conventional carbon coating. The wet milled LiFePO4 delivers 149 mAhg(-1) at 0.1 C, which is comparable to carbon coated LiFePO4 and approximately 74% higher than that of dry milled LiFePO4, suggesting that the wet milling process can increase the capacity in addition to conventional carbon coating methods. UV spectroscopy, elemental microanalysis, and evolved gas analysis are used to find the root cause of the capacity improvement during the mechanochemical reaction in acetone. The analytical results show that the improvement is attributed to the conductive residual carbon on the surface of the wet milled LiFePO4 particles, which is produced by the reaction of FeC2O4 center dot 2H(2)O with acetone during wet milling through oxygen deficiency in the precursor.
Keywords
ELECTROCHEMICAL PROPERTIES; COATED LIFEPO4; PHOSPHO-OLIVINES; RATE PERFORMANCE; COMPOSITE; ELECTROCHEMICAL PROPERTIES; COATED LIFEPO4; PHOSPHO-OLIVINES; RATE PERFORMANCE; COMPOSITE; Lithium iron phosphate; Wet milling; Mechanochemical reaction; Rate capability; Carbon coating
ISSN
0253-2964
URI
https://pubs.kist.re.kr/handle/201004/130634
DOI
10.5012/bkcs.2011.32.2.536
Appears in Collections:
KIST Article > 2011
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