多壁碳纳米管三元复合正极材料的制备及性能  

Preparation and properties of multiwalled carbon nanotubes ternary composite cathode materials

作　　者：王玉慧[1] 王超会[1] 岳成娥[1] 于岩[1] WANG Yu-hui,WANG Chao-hui,YUE Cheng-e,YU Yan(College of Materials Science and Engineering, Qiqihar University,Qiqihar Heilongjian 161006,China)

机构地区：[1]齐齐哈尔大学材料科学与工程学院,黑龙江齐齐哈尔161006

出　　处：《电源技术》2018年第8期1098-1102,共5页Chinese Journal of Power Sources

基　　金：黑龙江省省属高等学校基本科研业务费科研项目(135209301);齐齐哈尔大学青年教师科研启动支持计划(2014K-M01;355146)

摘　　要：针对富锂层状材料电子电导率低的问题,采用简单研磨煅烧的方式制备了多壁碳纳米管(MWCNT)与富锂层状材料复合的正极材料。电化学测试结果表明,MWCNT的引入有效地提高了电极材料的电导率,从而改善了富锂层状正极材料的电化学性能。并且发现:MWCNT含量为3%的复合材料表现出更加优异的电化学性能。复合电极材料在室温环境下的放电比容量高达242.5 mAh/g,并展示出良好的倍率性能和循环稳定性,5 C下,50次循环后的比容量仍能达到106.6 mAh/g。In order to overcome the low electronic conductivity of lithium-rich layered cathode material, a multi-walled carbon nanotube（MWCNT）/Li1.18Ni0.15Co0.15Mn0.52O2 composite material was prepared by simply grinding method. The electrochemical test results show that the electronic conductivity of the material is improved obviously with the cooperation of MWCNT, and the electrochemical performance of the composite material is improved. In addition, with small amount of MWCNT, i.e. 3%, the composite material exhibits much better electrochemical performance than the bare material. It shows a discharge capacity of 242.5 mAh/g at room temperature with superior cycle stability and rate capability. The composite material is able to deliver 106.6 mAh/g after 50 cycles at 5 C current rate.

关 键 词：富锂层状正极材料 MWCNT 电导率 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]