Preparation and electrochemical performance of Li4Ti5O12/carbon/carbon nano-tubes for lithium ion battery
Preparation and electrochemical performance of Li4Ti5O12/carbon/carbon nano-tubes for lithium ion battery
复制标题
DOI：
10.1016/j.electacta.2010.01.015
复制
发表时间：
2010-03-01
影响因子：
6.6
通讯作者：
Yu, Zuolong
中科院分区：
文献类型：
--
作者：
Li, Xing;Qu, Meizhen;Yu, Zuolong
采用固相法合成了Li4Ti5O12/碳/碳纳米管(Li4Ti5O12/C/CNTs)复合材料。作为对比，本研究还合成了Li4Ti5O12/C(Li4Ti5O12/C)复合材料和纯Li4Ti5O12。用X射线衍射仪和扫描电子显微镜对样品的微观结构和形貌进行了表征。通过恒电流放电/充电测试和交流阻抗谱对样品的电化学性质进行了评价。结果表明，在Li4Ti5O12、Li4Ti5O12/C和Li4Ti5O12/C/CNTs样品中，Li4Ti5O12/C/CNTs复合材料表现出最好的倍率性能和循环稳定性。在0.5C、5.0C和10.0C的充放电倍率下，其放电容量分别为163mAhg、148mAhg和143mAhg。在5.0℃下循环100次后，它保持在146毫安/克。(C)2010年爱思唯尔有限公司。保留所有权利。
A Li4Ti5O12/carbon/carbon nano-tubes (Li4Ti5O12/C/CNTs) composite was synthesized by using a solid-state method. For comparison, a Li4Ti5O12/carbon (Li4Ti5O12/C) composite and a pristine Li4Ti5O12 were also synthesized in the present study. The microstructure and morphology of the prepared samples are characterized by XRD and SEM. Electrochemical properties of the samples are evaluated by using galvanostatic discharge/charge tests and AC impedance spectroscopy. The results reveal that the Li4Ti5O12/C/CNTs composite exhibits the best rate capability and cycling stability among the samples of Li4Ti5O12, Li4Ti5O12/C and Li4Ti5O12/C/CNTs. At the charge-discharge rate of 0.5 C, 5.0 C and 10.0 C, its discharge capacities were 163 mAh/g, 148 mAh/g and 143 mAh/g, respectively. After 100 cycles at 5.0 C, it remained at 146 mAh/g. (C) 2010 Elsevier Ltd. All rights reserved.