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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 27, Number 8
BKCSDE 27(8)
August 20, 2006 

Synthesis of Silicon-Carbon by Polyaniline Coating and Electrochemical Properties of the Si-C|Li Cell
Chil-Hoon Doh*, Seong Il Kim, Ki-Young Jeong, Bong-Soo Jin, Kay Hyeok An, Byung Chul Min, Seong-In Moon, Mun-Soo Yun
Lithium battery, Anode, Silicon, Carbon
Si-C composites were prepared by the carbonization of polyaniline (PAn) coated on silicone powder. The physical and electrochemical properties of the Si-C composites were characterized by particle-size analysis, Xray diffraction, scanning electron microscopy, and battery electrochemical tests. The average particle size of Si was increased by the coating of Pan but somewhat reduced by the carbonization to give silicone-carbon composites. The co-existence of crystalline silicone and amorphous-like carbon was confirmed by XRD analyses. SEM photos showed that the silicone particles were well covered with carbonaceous materials, depending on the PAn content. Si-C|Li cells were fabricated using the Si-C composites and tested using galvanostatic charge-discharge. Si-C|Li cells gave better electrochemical properties than Si|Li cells. Si-C|Li cells using Si-C from HCl-undoped precursor PAn showed better electrochemical properties than precursor PAn doped in HCl. The addition of an electrolyte containing 4-fluoroethylene carbonate (FEC) increased the initial discharge capacity. Also, another electrochemical test, the galvanostatic charge-discharge test with GISOC (gradual increasing of the state of charge) was carried out. Si-C(Si:PAn = 50:50 wt. ratio)|Li cell showed 414 mAh/g of reversible specific capacity, 75.7% of IIE (initial intercalation efficiency), 35.4 mAh/g of IICs (surface irreversible specific capacity).
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