Electrochemical characteristics of phosphours doped Si-C composite for anode active material of lithium secondary batteries
- Electrochemical characteristics of phosphours doped Si-C composite for anode active material of lithium secondary batteries
- 노재현; 이관영; 이중기
- secondary batteries; anode; silicon-carbon composite; phosphorus doping; arc plasma pyrolysis
- Issue Date
- TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
- VOL 19, NO 4, 1018-1022
- 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
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