摘要
以无水乙醇为溶剂,醋酸锂、钛酸丁酯和石墨为原料,采用湿法制备了Li4Ti5O12/石墨复合材料.采用X-射线衍射、红外光谱、扫描电镜和电化学测试等对合成产物进行了表征.结果表明:600℃氩气气氛中煅烧6 h可制得碳质量分数5%左右的Li4Ti5O12/石墨复合材料,其可逆容量达到167.1 mAh.g-1;经80次循环后,0.1C放电时,容量保持率为99.0%,2.0 C放电时容量保持率达到105.1%.与纯Li4Ti5O12相比,Li4Ti5O12/石墨复合材料具有更好的循环性能和倍率性能,是一种优良的锂离子电池负极材料.
Li4Ti5O12/graphite composite was prepared by sol-gel method using ethyl alcohol as solvent,lithium acetate and tetrabutyl titanate and graphite as raw materials.Li4Ti5O12/graphite composites were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM) combined with electrochemical tests.Results show that Li4Ti5O12/graphite composite with 5% carbon mass fraction containing can be obtained by annealing the precursor at 600 ℃ for 6 h in Ar atomophere.The composites can deliver a specific capa...
出处
《吉首大学学报（自然科学版）》
CAS
2010年第1期91-95,共5页
Journal of Jishou University(Natural Sciences Edition)
基金
Supported by National Natural Science Foundation of China(20376086)
Postdoctoral Science Foundation of China(2005037700)
Hunan Provincial Natural Science Foundation of China(07JJ3014)
Scientific Research Fund of Hunan Provincial Education Depart ment(07A058)
Postdoctoral Science Foundation of Central South University(2004107)
关键词
锂离子电池
LiTiO
负极
湿法
lithium ion batteries
Li4Ti5O12
anode
wet method
