Electrochemical characteristics of surface modified silicon powder as the anode material for lithium ion batteries
- Electrochemical characteristics of surface modified silicon powder as the anode material for lithium ion batteries
- 김아영; 박지훈; 차이룰 후다야; 변동진; 이중기
- Issue Date
- Surface modified Si particles have been synthesized via metal-assisted chemical etching
process. Si powders were immersed in a solution of 0.036 mol L-1 silver nitrate (AgNO3) and
2.5 mol L−1 aqueous HF solution at 45 °C for 10 min to deposit Ag layers onto the Si surface
via galvanic displacement reaction. As-synthesized Si powders were immersed in a nitric acid
and deionized water (1:1 vol. %) at room temperature to remove Ag particles and followed by
drying in an oven at 80°C for 2 h. Structural, electrical, and electrochemical characterizations
of all samples were conducted by field emission-scanning electron microscopy (FE-SEM), xray
diffraction (XRD), transmission electron microscope (TEM), hall measurement, and
galvanostatic charge-discharge tests. Surface modified Si particles exhibited higher specific
capacity of ~2,565 mAh g-1 as well as more stable cycle performance than bare silicon. In
addition, the excellent electrochemical performance was obtained when a mixing ratio (R) of
Si to conducting agent was 1.5.
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