文献类型：期刊文献

中文题名：沥青基球形硬炭的电化学性能研究

英文题名：Study on electrochemical properties of pitch-based spherical hard carbon

作者：余盼[1];梁晓怿[1];杨全俊[1];冯秀文[1]

机构：[1]华东理工大学化学工程联合国家重点实验室,上海200237

年份：2018

卷号：42

期号：2

起止页码：172

中文期刊名：电源技术

外文期刊名：Chinese Journal of Power Sources

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD_E2017_2018】；

基金：国家自然科学基金资助项目(21177038)

语种：中文

中文关键词：球形硬炭;负极;锂离子电池;电化学性能

外文关键词：spherical hard carbon;anode;lithium ion battery;electrochemical performance

摘要：以石油沥青为原料,采用悬浮加热法分别制备了颗粒状和球状硬炭。采用X射线衍射分析、扫描电子显微镜以及CO_2吸附测试对材料结构进行表征;利用恒流充放电和电化学阻抗谱技术对电化学性能进行了测试。结果表明,随着炭化温度从1 000℃升高到1 400℃,球状硬炭材料的CO_2吸附比表面积、孔容和充放电比容量逐渐减小,而首次库仑效率逐渐升高。在电流密度为37.2 mA/g下循环100次后球状硬炭的体积容量比颗粒状硬炭高出17.7%,且球形硬炭的电阻更小,在电流密度为1 860 mA/g时的比容量为103.3 mAh/g。
The particulate and spherical hard carbons were prepared by heating petroleum pitch precursors in suspension liquid. The morphology and structure of hard carbon were characterized by X-ray diffraction, scanning electron microscope and CO_2 adsorption measurements. The electrochemical performance was tested by constant charge-discharge and electrochemical impedance spectroscopy. The results show that as the heat-treatment temperature increases from 1 000 ℃ to 1 400 ℃, the CO_2 adsorption specific surface area, pore volume and charge-discharge capacity of the spherical hard carbon material gradually decrease, while the first columbic efficiency gradually increases. The volume capacity of the spherical hard carbon material is 17.7% higher than the particulate one after 100 cycles at the current density of 37.2 mA/g, the resistance of the spherical hard carbon is smaller, and the specific capacity of the spherical hard carbon is 103.3 mAh/g at the current density of 1 860 mA/g.