Preparation of Bundle Type Silicon Nanorode Anode through Electroless Etching Process Using Silver Ions for the Anode Materials for Lithium Ion Batteries
- Preparation of Bundle Type Silicon Nanorode Anode through Electroless Etching Process Using Silver Ions for the Anode Materials for Lithium Ion Batteries
- 김정섭; 정훈기; 변동진; 이중기
- Issue Date
- International Congress on Materials and Renewable Energy (MRE 2013)
- Currently, a commonly-used graphite material has a theoretical capacity of 372 mAh g-1, whereas silicon has a theoretical electric capacity of about 4200 mAh g-1 [1-3]. However, the silicon has many obstacles such as physical stress during the insertion and extraction of Li+ ions. Owing to this volume expansion, the silicon structure breaks down, so that the electron pathway of an electrode is blocked, with the result that dead volume is formed in the electrode, thus causing the reduction in capacity of the silicon anode. Therefore, as the cell is continuously charged and discharged, its capacity is rapidly decreased. Such a life deterioration phenomenon significantly occurs in a bulk silicon film or particles of micrometers in size.
This study relates to bundle type silicon nanorod (BSNR) which can improve the discharge capacity and life cycle characteristics of a secondary cell by controlling the shape of silicon thick film through an electroless etching process. The prepared BSNR structure which composed of columnar bundle has a diameter of 50-150 nm and length of 1 and 1.8 micrometer, respectively. The etching depths of the nanorod have significant effect on the electrochemical performance such as capacity fading and coulombic efficiencies. The BSNR electrode provides a high capacity and high efficiency anode for lithium ion cell, which can overcome obstacles of silicon thick film and improve the electrode deterioration attributable to volume change due to its unique self-relaxant structure.
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