Effect of Hydrogen Plasma Pretreatment on the Growth of Silicon Nanowires and Their Employment as the Anode Material of Lithium Secondary Batteries

Title
Effect of Hydrogen Plasma Pretreatment on the Growth of Silicon Nanowires and Their Employment as the Anode Material of Lithium Secondary Batteries
Authors
김정섭Dongjin Byun이중기
Keywords
Si Nanowire; PE-CVD; Hydrogen Plasma Effect; Lithium Secondary Batteries
Issue Date
2012-02
Publisher
Journal of nanoscience and nanotechnology
Citation
VOL 12, NO 2, 1429-1433
Abstract
Silicon nanowires were grown from a silane and argon gas mixture directly on a stainless steel substrate by radio-frequency plasma enhanced chemical vapor deposition (RF-PECVD) and used without any further treatment as the anode in the fabrication of lithium ion batteries. It was found that suitable pretreatment of the stainless steel substrate was required for the satisfactory growth of the silicon nanowires. In this study, the substrates were polished, etched in HF solution, coated with an aluminum catalyst layer with a thickness of c.a. 10 nm and then treated with a hydrogen plasma before the growth of the silicon nanowires. SEM (Scanning Electron Microscopy) and AFM (Atomic Force Microscopy) analyses showed that the grain size and surface roughness were increased after the hydrogen plasma pretreatment. The electrochemical performance of the silicon nanowires anode was also improved when the aluminum coated stainless steel substrate was exposed to the plasma for 20 min or longer; the initial coulombic efficiency was increased from 69.7% to 82% at a current density of 30 mA cm−2.
URI
http://pubs.kist.re.kr/handle/201004/42243
ISSN
15334880
Appears in Collections:
KIST Publication > Article
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