Germanium microflower-on-nanostem as a high-performance lithium ion battery electrode

Title
Germanium microflower-on-nanostem as a high-performance lithium ion battery electrode
Authors
이광희권석준박경수강진구박재관Sungjun LeeJae-Chan KimHyun-Woo ShimDong-Wan Kim
Keywords
batteries; nanowires; germanium; germanium oxide; microsphere
Issue Date
2014-11
Publisher
Scientific Reports
Citation
VOL 4, 6883-1-6883-9
Abstract
We demonstrate a new design of Ge-based electrodes comprising three-dimensional (3-D) spherical microflowers containing crystalline nanorod networks on sturdy 1-D nanostems directly grown on a metallic current collector by facile thermal evaporation. The Ge nanorod networks were observed to self-replicate their tetrahedron structures and form a diamond cubic lattice-like inner network. After etching and subsequent carbon coating, the treated Ge nanostructures provide good electrical conductivity and are resistant to gradual deterioration, resulting in superior electrochemical performance as anode materials for LIBs, with a charge capacity retention of 96% after 100 cycles and a high specific capacity of 1360 mA h g21 at 1 C and a high-rate capability with reversible capacities of 1080 and 850 mA h g21 at the rates of 5 and 10 C, respectively. The improved electrochemical performance can be attributed to the fast electron transport and good strain accommodation of the carbon-filled Ge microflower-on-nanostem hybrid electrode.
URI
http://pubs.kist.re.kr/handle/201004/48572
ISSN
20452322
Appears in Collections:
KIST Publication > Article
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