Li4Ti5O12／石墨复合材料的湿法制备与表征  

Wet method preparation and characterization of Li4Ti5O12/graphite composite

作　　者：熊利芝[1,2] 何则强[1,2] 尹周澜[2] 陈启元[2] 

机构地区：[1]吉首大学化学化工学院,吉首416000 [2]中南大学化学化工学院,长沙410083

出　　处：《中国有色金属学报》2008年第E01期306-309,共4页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目（20376086）：中国博士后科学基金资助项目（2005037700）;湖南省自然科学基金资助项目（07JJ3014）;湖南省教育厅科学研究重点资助项目（07A058）;中南大学博士后科学基金资助项目（2004107）

摘　　要：以醋酸锂、钛酸丁酯和石墨为原料，无水乙醇为溶剂，采用湿法制备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对合成产物进行表征。结果表明：600℃氩气气氛中煅烧6h可制得含碳量5％左右的Li4Ti5O12／石墨复合材料，其可逆容量达到167．1mA·h／g；经80次循环后，0．1C放电时容量保持率为99．0％，2．0C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 wet method using lithium acetate, tetrabutyl titanate and graphite as raw materials, ethyl alcohol as solvent. Li4Ti5O12/graphite composites were characterized by X-ray diffractometry （XRD）, scanning electron microscopy （SEM） and electrochemical tests. The results show that Li4Ti5O12/graphite composite with 5% carbon can be obtained by annealing the precursor at 600 ℃ for 6 h in Ar atomosphere. The composites can deliver a specific capacity of 167.1 mA·h/g, 99.0% and 105.1% of the capacity can be retained after being discharged for 80 times at 0.1C and 2.0C, respectively. Compared with pure Li4Ti5O12, Li4Ti5O12/graphite composite bears larger discharge capacity, better cyclability and rate performance, suggesting that Li4Ti5O12/graphite composite is a promising anode material for lithium ion batteries.

关 键 词：锂离子电池 LI4TI5O12 负极 湿法 

分 类 号：TM912.9[电气工程—电力电子与电力传动]