基于大孔炭电极的锂离子电池制备及性能

以新型SiO2大孔材料为载体,采用原位聚合及真空热解的方法制备出大孔径C/SiO2导电材料,以其为基体经SbCl3原位水解和高温重结晶得到三维大孔结构的C/SiO2/Sb2O3(crystal)复合材料.通过热重分析、X射线衍射、扫描电镜、充放电和交流阻抗等多种方法对C/SiO2/Sb2O3的结构和相应锂离子电池的性能...

Preparation and performance of Li-ion batteries based on macroporous carbon electrodes

Macroporous conducting C/SiO2 composite was prepared by in situ polymerization and vacuum pyrolysis in a novel silica macroporous carrier, using the conducting material as a substrate in which SbCl3 was introduced and converted into Sb2O3 through in situ hydrolysis. Recrystalization of Sb2O3 was carried out at high temperature to obtain the 3D macroporous C/SiO2/Sb2O3 （crystal） composites. The structure of C/SiO2/Sb2O3 and the electrochemical performances of the related lithium batteries were studied by differential scanning calorimetry （DSC）, thermogravimetry （TG）, scanning electron microscopy （SEM）, X-ray diffraction （XRD）, electrochemical charge-discharge experiments and impedance spectroscopy. The results showed that the macroporous C/SiO2 composite was suitable for the use as an electrode in lithium batteries. As the most important feature of the new electrode, the 3D macroporous structure ensured an improved combination of the conducting and electro-active materials, which not only enabled Sb2O3 to exhibit high capacity but also played a key role in reducing the resistance and improving the cycling stability.