Germanium Silicon Alloy Anode Material Capable of Tunable Overpotential by Nanoscale Si segregation

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Title
Germanium Silicon Alloy Anode Material Capable of Tunable Overpotential by Nanoscale Si segregation
Author(s)
Hyungki Kim; Yoonkook Son; Chibeom Park; Min-Joon Lee; Misun Hong; Jungah Kim; Minkyung Lee; Jaephil Cho; Hee Cheul Choi
Publication Date
2015-05
Journal
NANO LETTERS, v.15, no.6, pp.4135 - 4142
Publisher
AMER CHEMICAL SOC
Abstract
We developed the novel electrode that enables fine control of overpotential by exploiting surface segregation that is the enrichment of one component at the surface of binary alloy. To realize this approach, we controlled the proportion of Si with low Li diffusivity at the surface by annealing the SiGe nanowire in H2 environment at various temperatures. The resulting SiGe nanowires annealed at 850 °C exhibited high reversible capacity (>1031 mA·h·g−1), and long cycle life (400 cycles) with high capacity retention (89.0%) at 0.2 C. This superior battery performance is attributed to the remaining unlithiated part acting as support frame to prevent pulverization of anode material, which results from the fine-tuning of overpotential by controlling the degree of Si segregation.
URI
https://pr.ibs.re.kr/handle/8788114/1672
ISSN
1530-6984
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
Files in This Item:
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