Electrochemical characteristics of phosphours doped Si-C composite for anode active material of lithium secondary batteries

Title
Electrochemical characteristics of phosphours doped Si-C composite for anode active material of lithium secondary batteries
Authors
노재현이관영이중기
Keywords
secondary batteries; anode; silicon-carbon composite; phosphorus doping; arc plasma pyrolysis
Issue Date
2009-09
Publisher
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Citation
VOL 19, NO 4, 1018-1022
Abstract
Phosphorus doped silicon-carbon composite particles were synthesized through a DC arc plasma torch. Silane(SiH4) and methane(CH4) were introduced into the reaction chamber as the precursor of silicon and carbon, respectively. Phosphine(PH3) was used as a phosphorus dopant gas. Characterization of synthesized particles were carried out by scanning electron microscopy(SEM), X-ray diffractometry(XRD), X-ray photoelectron spectroscopy(XPS) and bulk resistivity measurement. Electrochemical properties were investigated by cyclic test and electrochemical voltage spectroscopy(EVS). In the experimental range, phosphorus doped silicon-carbon composite electrode exhibits enhanced cycle performance than intrinsic silicon and phosphorus doped silicon. It can be explained that incorporation of carbon into silicon acts as a buffer matrix and phosphorus doping plays an important role to enhance the conductivity of the electrode, which leads to the improvement of the cycle performance of the cell. Key words: secondary batteries; anode; silicon-carbon composite; phosphorus doping; arc plasma pyrolysis
URI
http://pubs.kist.re.kr/handle/201004/35772
ISSN
1003-6326
Appears in Collections:
KIST Publication > Article
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