锰酸锂改性及其电化学性能研究  

Investigation of Electrichemical Properties of Modified LiMn_2O_4

作　　者：高明[1] 孙晓刚[1,2] 程利[1] 吁霁[3] 

机构地区：[1]南昌大学机电学院,南昌330031 [2]南昌太阳纳米技术有限公司,南昌330031 [3]南昌大学理学院,南昌330031

出　　处：《材料导报》2011年第18期63-65,共3页Materials Reports

基　　金：国家自然科学基金(60661001);江西省教育厅2009科研项目

摘　　要：以多壁碳纳米管(Multi-walled carbon nanotubes,MWCNTs)为添加相,对锰酸锂进行电化学性能改进,采用扫描电子显微镜对其进行观察,发现掺入的多壁碳纳米管均匀分布在锰酸锂颗粒表面。以改性后的锰酸锂为主要材料制成纽扣电池,采用交流阻抗及恒电流充放电等技术进行检测。结果表明,掺入1%MWCNTs后LiMn2O4的初始放电容量由改性前的123mAh/g下降到改性后的117mAh/g,在25℃经10次循环后容量保持率为97%,明显高于未掺入的91%。与未掺杂的LiMn2O4相比,虽然掺C或掺CNTs都使初始充放电容量有所降低,但是其循环性能明显提高。The experiment take multi-walled carbon nanotubes（MWCNTs） as adding phase to improve the electrochemical performance of LiMn2O4. Scanning electron microscope（SEM） oboserval/ion demostrated that the multiwalled carbon nanotubes were evenly distributed on LiMn2O4 granular surface. With the modified LiMn2O4 as main cathod materials to make button batteries. The properties of the battery were measured by adopting ac impedance and constant current charge-discharge method. The results show that the initial discharge capacity dropped from 123mAh/ g to 117mAh/g after doping 1% MWCNTs. The cycle performance was significantly improved. The capacity retain ratio is 97% compared with 91% of undopped LiMn204 under 25℃ by 10 times cycle.

关 键 词：锰酸锂 多壁碳纳米管 循环性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]