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Author

Cho, Jaephil
Nano Energy Storage Materials Lab (NESM)
Research Interests
  • Li-ion battery, metal-air battery, redox-flow battery, flexible battery .

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Surface-stabilized amorphous germanium nanoparticles for lithium-storage material

Cited 47 times inthomson ciCited 43 times inthomson ci
Title
Surface-stabilized amorphous germanium nanoparticles for lithium-storage material
Author
Lee, HyojinKim, Min GyuChoi, Cheol HoSun, Yang-KookYoon, Chong SeungCho, Jaephil
Keywords
Amorphous materials; Fourier transform infrared spectroscopy; Germanium; Molecular structure; Particle size analysis; Thermodynamics; Transmission electron microscopy
Issue Date
200511
Publisher
AMER CHEMICAL SOC
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.
URI
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DOI
http://dx.doi.org/10.1021/jp052620y
ISSN
1520-6106
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