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Kim, Jin Young
Next Generation Energy Laboratory
Research Interests
  • Polymer solar cells, QD solar cells, organic-inorganic hybrid solar cells, perovskite solar cells, OLEDs, PeLEDs, organic FETs

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Capacity retention behavior and morphology evolution of SixGe1-x nanoparticles as lithium-ion battery anode

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Title
Capacity retention behavior and morphology evolution of SixGe1-x nanoparticles as lithium-ion battery anode
Author
Ge, MingyuanKim, SeongbeomNie, AnminShahbazian-Yassar, RezaMecklenburg, MatthewLu, YunhaoFang, XinShen, ChenfeiRong, JiepengPark, Song YiKim, Dong SukKim, Jin YoungZhou, Chongwu
Issue Date
2015-06
Publisher
IOP PUBLISHING LTD
Citation
NANOTECHNOLOGY, v.26, no.25, pp.255702
Abstract
Engineering silicon into nanostructures has been a well-adopted strategy to improve the cyclic performance of silicon as a lithium-ion battery anode. Here, we show that the electrode performance can be further improved by alloying silicon with germanium. We have evaluated the electrode performance of SixGe1-x nanoparticles (NPs) with different compositions. Experimentally, SixGe1-x NPs with compositions approaching Si50Ge50 are found to have better cyclic retention than both Si-rich and Ge-rich NPs. During the charge/discharge process, NP merging and Si-Ge homogenization are observed. In addition, a distinct morphology difference is observed after 100 cycles, which is believed to be responsible for the different capacity retention behavior. The present study on SixGe1-x alloy NPs sheds light on the development of Si-based electrode materials for stable operation in lithium-ion batteries (e.g., through a comprehensive design of material structure and chemical composition). The investigation of composition-dependent morphology evolution in the delithiated Li-SiGe ternary alloy also significantly broadens our understanding of dealloying in complex systems, and it is complementary to the well-established understanding of dealloying behavior in binary systems (e.g., Au-Ag alloys)
URI
https://scholarworks.unist.ac.kr/handle/201301/17061
URL
http://iopscience.iop.org/article/10.1088/0957-4484/26/25/255702/meta
DOI
10.1088/0957-4484/26/25/255702
ISSN
0957-4484
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