Sn-induced low-temperature growth of Ge nanowire electrodes with a large lithium storage capacity

Title
Sn-induced low-temperature growth of Ge nanowire electrodes with a large lithium storage capacity
Authors
고영대강진구이광희박재관박경수Yun-Ho JinDong-Wan Kim
Keywords
germanium; nanowires; Li ion battery; anodes
Issue Date
2011-08
Publisher
NANOSCALE
Citation
VOL 3, NO 8, 3371-3375
Abstract
We herein present the synthesis of germanium (Ge) nanowires on Au-catalyzed low-temperature substrates using a simple thermal Ge/Sn co-evaporation method. Incorporation of a low-melting point metal (Sn) enables the efficient delivery of Ge vapor to the substrate, even at a source temperature below 600 ℃. The as-synthesized nanowires were found to be a core/shell heterostructure, exhibiting a uniform single crystalline Ge sheathed within a thin amorphous germanium suboxide (GeOx) layer. Furthermore, these high-density Ge nanowires grown directly on metal current collectors can offer good electrical connection and easy strain relaxation due to huge volume expansion during Li ion insertion/extraction. Therefore, the self-supported Ge nanowire electrodes provided excellent large capacity with little fading upon cycling (a capacity of ~900 mA h g-1 at 1C rate).
URI
http://pubs.kist.re.kr/handle/201004/40653
ISSN
2040-3364
Appears in Collections:
KIST Publication > Article
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