溶剂热法制备介孔球形钛酸锂负极材料  

Synthesis of mesoporous Li_4Ti_5O_(12) microspheres by solvothermal method

作　　者：林国兴[1] 梅天庆[1] 任春春[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》2015年第4期713-715,768,共4页Chinese Journal of Power Sources

摘　　要：以醋酸锂和钛酸四正丁酯为原料,使用NH4HCO3作为结构引导剂,通过溶剂热法后固相烧结合成了具有尖晶石型介孔球形Li4Ti5O12,探讨了不同的钛锂比和热处理温度及NH4HCO3用量对Li4Ti5O12结构和电化学性能的影响,并通过X射线衍射光谱法(XRD),扫描电子显微镜法(SEM)和恒流充放电对其进行了表征。结果表明通过该法在钛锂摩尔比为5∶4.3时,在800℃下热处理3 h可获得晶型与标准谱一致的Li4Ti5O12,在溶剂热过程中使用NH4HCO3做为结构诱导剂时,可获得具有介孔结构的球形Li4Ti5O12材料,该材料在充放电过程中显示出了较好的电化学性能。The mesoporous Li4Ti5O12 microspheres were synthesized by solvothermal method fol owed by solid-state calcinations using lithium acetate and tetrabutyl titanate as raw materials, NH4HCO3 as the structure-directing agent. The effects of different mole ratios of titanium to lithium, calcination temperature and the quantity of NH4HCO3 on the structure and electrochemical performance of Li4Ti5O12 were investigated by XRD, SEM and constant current charge-discharge. The results show that when the mole ratio of titanium to lithium is 5∶4.3 and the materials are calcined for 3 h at 800 ℃, the product is spinel Li4Ti5O12 which fits standard spectra. Using NH4HCO3 as the structure-directing agent during solvothermal process, mesoporous Li4Ti5O12 microspheres are obtained, having better electrochemical performance during charging and discharging.

关 键 词：溶剂热法 球形钛酸锂 负极材料 介孔结构 

分 类 号：TM912.9[电气工程—电力电子与电力传动]