材料科学
阳极
碳纳米管
X射线光电子能谱
傅里叶变换红外光谱
电极
电解质
复合材料
纳米技术
化学工程
化学
物理化学
工程类
作者
Zhi Yong Zhang,Zhenrong Sun,Yan Liu,Bing Sheng Liu,Lin Luo,Peng Su,Chao Lan,Shi Sheng Guo,Zi Qi Zhang,Xiang Han,Wei Huang,Zi Ping Wu,Mingsheng Wang,Song Yan Chen
标识
DOI:10.1016/j.cej.2023.146504
摘要
The three-dimensional conductive network has been developed, creating a continuous pathway for Si anodes. Nonetheless, the weak physical contact between Si particles and the conducting network is prone to separation due to expansion stress and the solid electrolyte interface. This results in a rapid decline in cell cycling performance. Herein, we have developed a binder free Si@CNTs fibrous thin film structure using carbon nanotube (CNT) conducting networks through a high vacuum magnetic sputtering process of molecular reorganization. With Fourier Transform Infrared (FTIR), X-ray Photoelectron Spectroscopy (XPS) tests and density functional theory (DFT) calculations, we propose a strong “face-to-face” contact configuration based on Si-C bonds. The Si@CNTs film demonstrated stable mechanical and electrical properties even after repeated bending and stretching of up to 6%. In-situ transmission electron microscopy confirmed that the initial cycling volume expansion of the Si@CNTs fibers with Si-C bonds was only 58.33%. Furthermore, the full cell using Si@CNTs anode enabled stable high-rate cycling performance at 6C after 500 cycles. This innovative strategy redefines the conductive mode of CNTs with Si anodes.
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