无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2013, Vol. 45 ›› Issue (10): 60-.

• 论文 • 上一篇    

钴掺杂对Li1.2Mn0.6Ni0.2O2电化学性能的影响

刘 超1,刘红光1,2,叶学海2,郅晓科2,何爱珍2,赵 桢2,王旭阳2,章 甦2,时 洁2   

  1. 1.河北工业大学,天津 300130;2.中海油天津化工研究设计院
  • 出版日期:2013-10-10 发布日期:2013-10-08

Influence of Co doping on electrochemical properties of Li1.2Mn0.6Ni0.2O2

Liu Chao1,Liu Hongguang1,2,Ye Xuehai2,Zhi Xiaoke2,He Aizhen2, Zhao Zhen2,Wang Xuyang2,Zhang Su2, Shi Jie2   

  1. 1.Hebei University of Technology,Tianjin 300130,China;2.CNOOC Tianjin Chemical Research & Design Institute
  • Published:2013-10-10 Online:2013-10-08

摘要: 利用共沉淀法制备了锂离子电池正极材料Li1.2Mn0.6Ni0.2O2和Li1.2Mn0.588Ni0.196Co0.016O2,并利用XRD、SEM和充放电测试对其晶体结构、形貌和电化学性能进行了表征。XRD结果表明:掺杂钴材料后,材料的层状结构保持完整,阳离子混排程度降低。电化学性能测试结果表明:掺钴材料的首次充放电效率和倍率放电性能明显优于Li1.2Mn0.6Ni0.2O2,且表现出较优的循环性能,其1、2、5 C放电比容量分别为230.3、215.6、155.6 mA·h/g,1 C下循环 50次的容量保持率为90.9%。

关键词: 锂离子电池, 正极材料, Co掺杂, Li1.2Mn0.6Ni0.2O2

Abstract: Li1.2Mn0.6Ni0.2O2 and Li1.2Mn0.588Ni0.196Co0.016O2,cathode materials of lithium-ion batteries were synthesized by co-precipitation method.Their crystal structures,morphologies,and electrochemical properties were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),and electrochemical tests.XRD results indicated that material′s layered structure was kept intact and cation mixing degree was lowered after Co-doping.Electrochemical tests showed that:the initial charge-discharge efficiency and rate discharge performance of the Co-doping material were superior to those of Li1.2Mn0.6Ni0.2O2, and better cycle performance was displayed. Its discharge capacities were 230.3,215.6,155.6 mA·h/g at 1,2,5 C,respectively,and the capacity retention rate was up to 90.9% at 1 C after 50 cycles.

Key words: lithium-ion batteries, cathode material, Co-doping, Li1.2Mn0.6Ni0.2O2

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