A high-performance silicon/carbon composite as anode material for lithium ion batteries

被引:15
作者
Bai, Yangzhi [1 ]
Cao, Xinlong [1 ]
Tian, Zhanyuan [1 ,2 ]
Yang, Shifeng [1 ]
Cao, Guolin [1 ]
机构
[1] Shaanxi Coal Chem Ind Technol Res Inst Co Ltd, Xian 710070, Shaanxi, Peoples R China
[2] Xi An Jiao Tong Univ, Ctr Nanomat Renewable Energy, State Key Lab Elect Insulat & Power Equipment, Sch Elect Engn, Xian 710049, Shaanxi, Peoples R China
来源
NANO EXPRESS | 2021年 / 2卷 / 01期
关键词
lithium-ion battery; anode material; silicon; carbon; spray drying; carbon layer; AT-CARBON COMPOSITE; SI ANODE; LITHIATION;
D O I
10.1088/2632-959X/abdf2e
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
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 mu m to 24 mu 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.
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页数:8
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