Morphological and structural evolution of Si-Cu nanocomposites by an instantaneous vapor-liquid-solid growth and the electrochemical lithiation/delithiation performances
- Authors
- Liang, Jingshuang; Yang, Yulin; Gao, Jian; Zhou, Lei; Gao, Ming; Zhang, Zhongyuan; Yang, Wenfei; Javid, Muhammad; Jung, Youngguan; Dong, Xinglong; Cao, Guozhong
- Issue Date
- Mar-2019
- Publisher
- SPRINGER
- Keywords
- Polymorphic; Si-Cu nanocomposite; Arc-discharge plasma; Anode; Lithium-ion battery
- Citation
- JOURNAL OF SOLID STATE ELECTROCHEMISTRY, v.23, no.3, pp 735 - 748
- Pages
- 14
- Journal Title
- JOURNAL OF SOLID STATE ELECTROCHEMISTRY
- Volume
- 23
- Number
- 3
- Start Page
- 735
- End Page
- 748
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/25554
- DOI
- 10.1007/s10008-018-04173-6
- ISSN
- 1432-8488
1433-0768
- Abstract
- Polymorphic Si-Cu nanocomposites of Si@Cu3Si nanowires, Si@Cu3Si nanorods, and Si@Cu3Si(Cu) nanocapsules are synthesized via the high-energy arc-discharge plasma. Electrochemical performances of these materials as anodes for lithium-ion batteries are also investigated. It is found that the morphologies and structures of above Si-Cu nanocomposites are alterable by the composition of the raw target and synthetic conditions. Optical emission spectroscopy is adopted to reveal the energetic states of excited atoms in plasma; thus, the temperature of working plasma as well as the evaporation rate of each element can be evaluated, in which both favor to control the composition of Si-Cu nanopowder product and the aborative nanostructures. Formation of multifarious Si-Cu nanostructures is understood from the in situ nucleation and anisotropic growth processes, induced by an instantaneous vapor-liquid-solid mechanism within the robust plasma. The optimal composition and microstructure of Si@Cu3Si nanorods are found for the excellent electrochemical behaviors, typically a stable discharge capacity of 783mAhg(-1) with the coulombic efficiency of 98.51% at 100mAg(-1) after 100 cycles. Good performances are attributed to one-dimensional Si-Cu nanostructure, which favors to promote Li+ ion diffusion. Metallic Cu component released from Cu3Si precursor enhances the conductivity, buffers the volume change, and facilitates the stabilization in cycling.
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Collections - Department of Mechanical Engineering > 1. Journal Articles
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