阳极
材料科学
锂(药物)
电化学
复合数
碳纤维
纳米颗粒
化学工程
透射电子显微镜
无定形固体
锂离子电池
复合材料
无定形碳
电池(电)
纳米技术
电极
化学
有机化学
工程类
内分泌学
物理
物理化学
医学
功率(物理)
量子力学
作者
Yao Yu,Jingjing Zhang,Leigang Xue,Tao Huang,Aishui Yu
标识
DOI:10.1016/j.jpowsour.2011.08.009
摘要
A simple approach is proposed to prepare C-SiO2 composites as anode materials for lithium ion batteries. In this novel approach, nano-sized silica is soaked in sucrose solution and then heat treated at 900 °C under nitrogen atmosphere. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis shows that SiO2 is embedded in amorphous carbon matrix. The electrochemical test results indicate that the electrochemical performance of the C-SiO2 composites relates to the SiO2 content of the composite. The C-SiO2 composite with 50.1% SiO2 shows the best reversible lithium storage performance. It delivers an initial discharge capacity of 536 mAh g−1 and good cyclability with the capacity of above 500 mAh g−1 at 50th cycle. Electrochemical impedance spectra (EIS) indicates that the carbon layer coated on SiO2 particles can diminish interfacial impedance, which leads to its good electrochemical performance.
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