Electrochemical characteristics of surface modified silicon powder as the anode material for lithium ion batteries

Title
Electrochemical characteristics of surface modified silicon powder as the anode material for lithium ion batteries
Authors
김아영박지훈차이룰 후다야변동진이중기
Issue Date
2012-04
Publisher
한국전기화학회
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/43067
Appears in Collections:
KIST Publication > Conference Paper
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