摘要
介绍了采用液相包覆法,将沥青裂解碳包覆于天然球形石墨上,以改善其循环性能。将所制备的改性石墨材料作为锂离子电池的负极,以金属锂作为对电极做成模拟电池,测试其电化学性能。分别以0.1C、0.5C、2C、3C倍率充放电,考察其循环性能。同时还对样品材料进行了X射线衍射(XRD)分析、电化学阻抗(EIS)分析及电镜扫描(SEM)分析。结果表明,沥青包覆改性有效地提高了电池的电化学性能;最佳实验条件为:烧结温度850℃,沥青含量10%。
The natural graphite was coated by pitch in liquid environment to improve its cycle performance.In order to study the electrochemical performance, the batteries were fabricated with metal lithium as the opposite electrode and the modified natural graphite as carbon anode materials, and then the battery was cycled at 0. 1C, 0. 5C, 2C, 3C. The materials were characterized by XRD, EIS and SEM. The results showed that the electrochemical performance of natural graphite coated with pitch was improved obviously.And the best experiment condition was that the natural graphite was sintered at the temperature of 850℃,the content of pitch was 1%.
出处
《电池工业》
CAS
2007年第5期298-302,共5页
Chinese Battery Industry
关键词
锂离子电池
碳负极
改性
包覆
沥青
Li-ion batteries
carbon anode
modification
coating
pitch
