中间相炭微球的制备及嵌锂性能考察  

Preparation and lithium insertion performance of mesocarbon microbeads

作　　者：李宝华[1] 李开喜[2] 吕永根[2] 凌立成[2] 康飞宇[3] 

机构地区：[1]清华大学深圳研究生院,广东深圳518057 [2]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001 [3]清华大学材料系,北京100084

出　　处：《材料科学与工艺》2003年第4期389-391,共3页Materials Science and Technology

基　　金：山西省自然科学基金资助项目(991068);中国科学院重点基金资助项目;石油大学重质油加工国家重点实验室开放基金资助项目.

摘　　要：为了获得更高嵌锂性能的锂离子电池负极用炭材料,以质量分数为3 7%吡啶不溶物的煤焦油为原料,在450℃下自生压热缩聚制备中间相炭微球(MCMB),采用恒电流充放电技术研究所得MCMB的充放电性能.研究发现:随着MCMB平均球径的增加,首次充放电可逆容量从246mA·h/g增至540mA·h/g,首次充放电效率先增加后减小;本实验条件下平均球径为8 9μm的MCMB的充放电性能最好.In order to choose carbon material for high lithium insertion performance, Mesocarbon Microbeads (MCMB) with different mean diameter were prepared from coal tars through heat treatment at 450 ℃ for different time under autoginious pressure. The heat treated coal tars were filtered at 150 ℃ and the residue was rinsed with pyridine. MCMB were obtained as pyrindine insoluble fraction. MCMB was heat-treated at (700 ℃) for 1 hour. The constant-current charge-discharge properties were investigated. It was found that the first reversible capacity increased from 246 to 540 mA·h/g with increasing of the mean diameter of MCMB; Otherwise, the first coulombic efficiencies increase firstly and then decrease. MCMB with mean diameter of (8.9 μm) show the best charge-discharge properties among samples examined.

关 键 词：中间相炭微球 嵌锂性能 锂离子电池 MCMB 电极材料 

分 类 号：TM911[电气工程—电力电子与电力传动]