溶胶-凝胶法制备球形Li_4Ti_5O_(12)及其电化学性能研究  

Synthesis of Spherical Li_4Ti_5O_(12) Materials by a Sol-gel Method and Their Electrochemical Properties

作　　者：李军[1] 陶熏[1] 唐盛贺[1] 朱建新[1] 

机构地区：[1]广东工业大学,广东广州510006

出　　处：《稀有金属材料与工程》2015年第6期1499-1503,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(20672023);广州市科技计划项目(2011Y1-00010);广东省科技计划项目(2012B050100010)

摘　　要：为提高Li4Ti5O12材料的振实密度,以十六烷基三甲基溴化铵(CTAB)为结构导向剂,通过溶胶-凝胶法合成了球形Li4Ti5O12材料。利用TGA/DSC、XRD、SEM、CV和恒流充放电仪对材料的结构、形貌和电化学性能进行测试。结果表明,在800℃热处理12 h所得样品为单一的尖晶石晶体结构,结晶度较高,颗粒基本呈规则球形、流动性较好,粒径分布均匀,并表现出较好的电化学性能,振实密度达1.86 g/m L。在室温下以0.1 C充放电时,其首次放电比容量为173.19 m Ah/g,50次充放电循环后其放电比容量保持率为97.4%。To increase the tap density of Li4Ti5O12,spherical Li4Ti5O12 was synthesized by a sol-gel method using hexadecyl trimethyl ammonium bromide（CTAB） as structure directing agents.The structure,morphology and electrochemical performance of the sample were tested by TGA/DSC,XRD,SEM,CV and galvanostatic charge/discharge device.It is found that when heated at 800 ℃ for 12 h,the sample has a pure spinel crystal structure,high degree of crystallinity,spherical particle,good fluidity,uniform particle size distribution and good electrochemical performance with a tap density of 1.86 g/mL.At 0.1 C discharging rate,the first discharge specific capacity is 173.19 mAh/g,and after 50 cycles,its specific discharge capacity retention rate is 97.4%.

关 键 词：锂离子电池 LI4TI5O12 球形 溶胶-凝胶法 

分 类 号：TM912[电气工程—电力电子与电力传动]