锂离子电池负极材料球形钛酸锂的合成及性能  

Synthesis and electrochemical performance of porous spherical Li_4Ti_5O_(12) as anode material for lithium secondary batteries

作　　者：贺利敏[1] 梅天庆[1] 鱼光楠[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京210016

出　　处：《电源技术》2011年第9期1055-1057,共3页Chinese Journal of Power Sources

摘　　要：以2 mol/L的四氯化钛为前驱体溶液,三嵌段共聚物F127为结构导向剂,通过悬浮辅助的蒸发诱导自组装乳化成球,马弗炉中500℃焙烧后得到多孔的二氧化钛球。然后用去离子水作为溶剂加入三嵌段共聚物F127和二水合醋酸锂,待溶解后再加入一定比例的前驱体二氧化钛,超声波分散30 min,干燥、烧结(马弗炉800℃)制备出具有尖晶石结构多孔球形的钛酸锂(Li4Ti5O12)粉末。这种高分散性的球形钛酸锂在电化学测试中具有优良的电化学性能,在1.0～2.5 V进行充放电电流密度为0.06 mA/cm2时,首次放电比容量为173.8 mAh/g,并且具有较好的循环性能。With a solution of titanium tetrachloride of 2 mol/L as the precursor solution, the triblock copolymer F127 as a structure directing agent, a ball was emulsified through evaporation-induced self-assembly method of suspension aid. A porous titanium dioxide ball was obtained by baking in a muffle furnace at 500 ℃.And then the deionized water as solvent was added into triblock copolymer F127 and lithium acetate dehydrate. A certain percentage of the precursor of titanium dioxide was mixed after dissolved. By ultrasonicing for 30 min, drying, sintering （muffle furnace 800 ℃）, the lithium titanate porous spherical （Li4Ti5O12） powder with spinel structure was prepared. This spherical lithium titanate of high dispersion material in electrochemical tests has excellent electrochemical properties. With charging and discharging electric current of 0.06 mA/cm^2 between 1.0 V and 2.5 V, the initial discharge specific capacity is 173.8 mAh/g. Moreover, it has good cycling performance.

关 键 词：锂离子电池 负极材料 钛酸锂 多孔球形 

分 类 号：TM912.9[电气工程—电力电子与电力传动]