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- W1726009715 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)." @default.
- W1726009715 created "2016-06-24" @default.
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- W1726009715 date "2015-05-29" @default.
- W1726009715 modified "2023-09-27" @default.
- W1726009715 title "Capacity retention behavior and morphology evolution of Si<i><sub>x</sub></i>Ge<sub>1−<i>x</i></sub>nanoparticles as lithium-ion battery anode" @default.
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- W1726009715 doi "https://doi.org/10.1088/0957-4484/26/25/255702" @default.
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