摘要
采用溶胶-凝胶法和化学沉积法制备了Li4Ti4.75Cu0.25O12/SnO2复合活性材料。通过X射线衍射（XRD）、扫描电镜（SEM）、恒流充放电测试对材料进行结构、形貌表征及电化学性能测试。结果表明：Li4Ti4.75Cu0.25O12/SnO2复合活性物质能够进一步改善倍率性能的同时,循环性能也得到了很好的保证。当电压在1~3 V时,电流密度为1C倍率条件下,Li4Ti4.75Cu0.25O12/SnO2复合材料首次放电比容量高达202.55 m A·h/g。经过50次循环后,容量仍保持在202.51 m A·h/g,容量保持率高达99.98%。
A series of Li4Ti4. 75Cu0.25O12/ SnO2 composite materials were prepared by Sol-Gel and chemical deposition method. Material structure,morphology and electrochemical performance were characterization by XRD,SEM and constant current charge-discharge test. The results showed that the Li4Ti4. 75Cu0.25O12/SnO2 composite material can improve the rate capability,as wel the cycle performance got guarantee in the meantimel. Under a potential of 1 ~ 3 V,the initial specific discharge capacity was 202. 55 m A·h / g at 1C,and 202. 51 m A·h / g about over50 cycles,only 0. 02% of capacity loss occurs to the composite active materials.
出处
《科学技术与工程》
北大核心
2015年第33期1-4,17,共5页
Science Technology and Engineering
基金
吉林省科技厅科技发展基金项目(201207213)资助
作者简介
第一作者简介：廉今兰（1972-），女，吉林省吉林市人，博士研究生。研究方向：锂离子电池材料。E-mail：lianjinlan@126．com。
