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Cho, Jaephil
Nano Energy Storage Material Lab.
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Surface-stabilized amorphous germanium nanoparticles for lithium-storage material

Author(s)
Lee, HyojinKim, Min GyuChoi, Cheol HoSun, Yang-KookYoon, Chong SeungCho, Jaephil
Issued Date
2005-11
DOI
10.1021/jp052620y
URI
https://scholarworks.unist.ac.kr/handle/201301/4720
Fulltext
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=28144433032
Citation
JOURNAL OF PHYSICAL CHEMISTRY B, v.109, no.44, pp.20719 - 20723
Abstract
Amorphous Ge nanoparticles with the particle size of ∼10 nm were prepared by capping butyl groups and were characterized using XAS, TEM, FT-IR reflectance, and electrochemical cycling. The XAS results for the first-cycle Ge nanoparticles exhibited either a little particle aggregation after reformation of the Ge-Ge metallic bond or reformation of Ge-Ge metallic bond followed by a little particle aggregation. More interestingly, butyl groups, being electrochemically stable, remained after cycling, and the quantum mechanical calculation of the thermodynamic energy of the reaction using the GAMESS (General Atomic and Molecular Electronic Structure System) program suggested the formation of a very stable surface Ge-C bond that cannot be easily subjected to the subsequent chemical reactions. Initial charge capacity is 1470 mAh/g with an irreversible capacity ratio of 12%; no capacity fading was observed out to 30 cycles. Even at 5 C rate discharging, capacity retention was 98%, compared to that at 0.2 C rate discharging. In addition, the capacity was fully recovered at 0.2 C rate cycling.
Publisher
AMER CHEMICAL SOC
ISSN
1520-6106
Keyword
TIN-BASED INTERMETALLICSANODE MATERIALSHIGH-CAPACITYELECTRODESSILICONNANOCRYSTALLINECOMPOSITESBATTERIESSYSTEMLI

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