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


Surface-stabilized amorphous germanium nanoparticles for lithium-storage material

DC Field Value Language Lee, Hyojin ko Kim, Min Gyu ko Choi, Cheol Ho ko Sun, Yang-Kook ko Yoon, Chong Seung ko Cho, Jaephil ko 2014-05-22T08:35:47Z - 2014-05-22 ko 2005-11 -
dc.identifier.citation JOURNAL OF PHYSICAL CHEMISTRY B, v.109, no.44, pp.20719 - 20723 ko
dc.identifier.issn 1520-6106 ko
dc.identifier.uri -
dc.identifier.uri ko
dc.description.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. ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher AMER CHEMICAL SOC ko
dc.subject Amorphous materials ko
dc.subject Fourier transform infrared spectroscopy ko
dc.subject Germanium ko
dc.subject Molecular structure ko
dc.subject Particle size analysis ko
dc.subject Thermodynamics ko
dc.subject Transmission electron microscopy ko
dc.title Surface-stabilized amorphous germanium nanoparticles for lithium-storage material ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-28144433032 ko
dc.identifier.wosid 000233342400012 ko
dc.type.rims ART ko
dc.description.wostc 47 *
dc.description.scopustc 43 * 2014-10-18 * 2014-07-12 *
dc.identifier.doi 10.1021/jp052620y ko
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