Surface-stabilized amorphous germanium nanoparticles for lithium-storage material

被引:109
作者
Lee, H
Kim, MG
Choi, CH
Sun, YK
Yoon, CS
Cho, J [1 ]
机构
[1] Kumoh Natl Inst Technol, Dept Appl Chem, Gumi, South Korea
[2] Pohang Univ Sci & Technol, Beamline Res Div, Pohang Accelerator Lab, Pohang, South Korea
[3] Kyungpook Natl Univ, Dept Chem, Taegu 702701, South Korea
[4] Hanyang Univ, Dept Chem Engn, Seoul 133791, South Korea
[5] Hanyang Univ, Div Engn & Mat Sci, Seoul 133791, South Korea
关键词
D O I
10.1021/jp052620y
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Amorphous Ge nanoparticles with the particle size of similar to 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.
引用
收藏
页码:20719 / 20723
页数:5
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