LiFePO_4/CNT复合材料的制备及电化学性能  

Synthesis and electrochemical performances of LiFePO_4/CNT composite materials

作　　者：张勇[1] 杜培培[1] 王力臻[1] 张爱勤[1] 宋延华[1] 李晓峰[1] 

机构地区：[1]郑州轻工业学院河南省表界面科学重点实验室,郑州450002

出　　处：《北京科技大学学报》2011年第2期205-209,共5页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(No.21001097);河南省科技厅基础与前沿技术研究项目(No.102300410107);河南省高等学校青年骨干教师资助计划项目(豫教高[2009]844号);郑州市科技攻关项目(No.0910SGYG23259);郑州市金水区科技攻关项目(金科字[2009]35号(35))

摘　　要：采用溶胶凝胶-微波法制备LiFePO4/碳纳米管(CNT)复合正极材料.考察不同微波时间和CNT含量对其电化学性能的影响,并通过X射线衍射(XRD)和扫描电子显微镜(SEM)对样品的晶型结构和表面形貌进行表征.结果表明:掺CNT量为2%(质量分数)和微波18 min所得样品有较好的电化学性能;0.1C充放电的首次放电比容量为142 mAh.g-1,第10次循环的比容量为136 mAh.g-1.LiFePO4/carbon nanotube （CNT） composite cathode materials were synthesized by a sol-gel-microwave method. The effects of microwave time and CNT content on the electrochemical properties of LiFePO4/CNT were studied and the crystal structure and surface morphology were characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The results show that the samples with better electrochemical performance are obtained when the CNT content in LiFePO4/CNT is 2% and the microwave time is 18 rain. When charge-discharge cycling at 0. 1 C, the initial specific discharge capacity is 142 mAh·g^-1 and the specific capacity at the 10th cycle is 136mAh·g^-1.

关 键 词：锂电池 正极材料 碳纳米管 溶胶凝胶法 微波加热 

分 类 号：TM912.9[电气工程—电力电子与电力传动] TQ152[化学工程—电化学工业]