摘要
研究了一种制备锂离子电池负极材料的Li4Ti5O12新工艺。以醋酸锂和钛酸丁酯为原料，异丙醇为溶剂，采用溶胶-凝胶法制备前驱体，再通过一定的热处理后制备了锂离子电池负极材料Li4Ti5O12采用XRD、SEM及电化学性能测试等分析手段考察了不同热处理温度对产品性能的影响。结果发现，经过850℃热处理24h后得到的产品粒径分布均匀、结晶度好；并且表现出较好的电化学性能，在1～2．5V之间充放电，0．1、1．0和2．0C首次放电比容量分别达到174．5、154．9和124．38mAh／g，并且大电流充放电时具有较好的循环性能。研究表明该方法是适合制备高活性的Li4Ti5O12工艺方法。
A novel technique was developed to prepare Li4Ti5O12 anode material for lithium secondary batteries. The precursor was prepared by sol-gel method using terbutyl titanate,lithium acetate and isopropanol as starting materials. Then the precursor was calcined for 24h in air to obtain Li4Ti5O12. The influence of temperature on performance of product was studied. The investigation of XRD,SEM and the determination of the eldetromical properties show that the Li4Ti5O12 powers prepared by this method are narrowly distributed ,well crystallized. The Li4Ti5O12 powers also have excellent electrochemical performance. Between 1.0-2.5V versus Li,it delivered 175.8,154.9 and 124.38mAh/g at 0.1,1.0 and 2.0C respectively. And it showed good cycle performance under high current density. Study shows that this method is appropriate for preparing Li4Ti5O12 with high electro- chemical performance.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2009年第3期424-426,共3页
Journal of Functional Materials
基金
国家重点基础研究发展计划(973计划)资助项目(2007CB613607)
