Capacity retention behavior and morphology evolution of Si < inf> x Ge < inf> 1-x nanoparticles as lithium-ion battery anode
Document Type
Article
Publication Date
6-26-2015
Abstract
© 2015 IOP Publishing Ltd. 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).
Publication Title
Nanotechnology
Recommended Citation
Ge, M.,
Kim, S.,
Nie, A.,
Shahbazian-Yassar, R.,
Mecklenburg, M.,
Lu, Y.,
Fang, X.,
Shen, C.,
Rong, J.,
Yi Park, S.,
Suk Kim, D.,
Young Kim, J.,
&
Zhou, C.
(2015).
Capacity retention behavior and morphology evolution of Si < inf> x Ge < inf> 1-x nanoparticles as lithium-ion battery anode.
Nanotechnology,
26(25).
http://doi.org/10.1088/0957-4484/26/25/255702
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/9649