硝酸改性碳微球的制备及电化学性能

为了提高碳电极材料的比容量,将悬浮聚合法合成的聚苯乙烯微球经高温碳化后,再通过浓HNO₃液相处理制备改性碳微球电极材料.通过场发射扫描电子显微镜、透射电子显微镜、N₂ 吸附解吸仪和傅里叶红外光谱表征所合成碳微球和改性碳微球的形貌和微观结构,以及循环伏安法和恒流充放电法测试改性碳微球电极材料的电化学性能,结果表明:在0.625 A/g的电流密度下改性后碳微球比容量达到246 F/g,且在12.5 A/g的大电流密度下仍然具有比未改性碳微球明显高的比容量.

Preparation of nitric acid modified carbon microspheres and its electrochemical performance

In order to improve the specific capacity of carbon electrode materials, the polystyrene microspheres synthesized by suspension polymerization were carbonized at high temperature, and then modified carbon microspheres electrode materials were prepared by concentrated HNO₃ liquid phase treatment. The morphology and microstructure of the unmodified and modified carbon microspheres were characterized by emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), N₂ adsorption and desorption apparatus and Fourier transform infrared (FTIR) spectrometer,and the electrochemical properties of the modified carbon microspheres electrode materials were measured by cyclic voltammetry (CV) and constant current charge-discharge method. The results showed that the specific capacity of the modified carbon microspheres was up to 246 F/g at the current density of 0.625 A/g, and even at a high current density of 12.5 A/g, the specific capacity of the modified carbon microspheres was still higher than that of the unmodified carbon microspheres.