A high-performance silicon/carbon composite as anode material for lithium ion batteries. (10th February 2021)

• Record Type: Journal Article
• Authors: Bai, Yangzhi; Cao, Xinlong; Tian, Zhanyuan; Yang, Shifeng; Cao, Guolin
• Is Part Of: Nano express. Volume 2:Number 1(2021)
• Publication Date: 2021-02-10
• Subjects: lithium-ion battery -- anode material -- silicon/carbon -- spray drying -- carbon layer; Nanotechnology -- Periodicals; Nanoscience -- Periodicals; 620.5
• DOI: 10.1088/2632-959X/abdf2e
• Languages: English
• ISSNs: 2632-959X

Abstract

Abstract: To overcome the existing rapid capacity decay, low conductivity and the expands and contracts in volume of Si/C composite anodes in lithium ion batteries, we have developed a silicon/carbon composite by spray drying and twice organic carbon source cladding process. The samples are characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectrometer, thermogravimetric analysis and x-ray photoelectron spectra (XPS). The electrochemical performance are analyzed by half-cell and full-cell experiments. The results show that the silicon/carbon composite is core–shell structure with the silicon embedded graphite as core and organic carbon layers as the shell, the particle size range from 8 μ m to 24 μ m. The first reversible capacity and initial coulombic efficiency of the silicon/carbon composite are 936.4 mAh g −1 and 88.6% in half-cell. The silicon/carbon composite exhibits a high capacity retention up to 80% after 680 cycles in full-cell, indicating an excellent cycling stability. The structure is beneficial to control volume expansion, improve conductivity and electrochemical performance.