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›› 2002, Vol. 2 ›› Issue (6): 0-0.

• 6 •    

锂离子电池正极材料LiNi0.8M0.2O2的制备

李辉,杨尚林,翟玉春,田彦文   

  1. 1. 东北大学材料与冶金学院,辽宁 沈阳 110004; 2. 辽宁石油化工大学石油化工学院,辽宁 抚顺 113001;3. 哈尔滨工程大学机电工程学院,黑龙江 哈尔滨 150001
  • 出版日期:2002-12-20 发布日期:2002-12-20

Preparation and Characterization of LiNi0.8M0.2O2 with Various Doping Elements for Lithium Battery Cathod

LI Hui1,2, YANG Shang-lin3, ZHAI Yu-chun1, TIAN Yan-wen1   

  1. 1. School of Material and Metallurgy, Northeastern University, Shenyang, Liaoning 110004, China; 2. Sch. Petrol. and Chem. Eng., Liaoning Univ. of Petrol. and Chem. Tech., Fushun, Liaoning 113001, China;3. School of Machinery and Electronics, Haerbin Engineering University, Haerbin, Helongjiang 150001, China
  • Online:2002-12-20 Published:2002-12-20

摘要: 在增加氧气压力的条件下,采用固相反应制得一系列掺杂不同元素M的锂离子电池正极材料LiNi0.8M0.2O2. 研究发现,掺杂Al, Mn, Ti可以改善材料的耐过充性和循环性能,在充电电压为4.2~4.8 V的范围内循环3次,材料的放电容量没有显著的改变. X射线衍射和扫描电镜分析表明,掺杂Al, Mn, Ti提高了镍酸锂材料的六方菱型结构的有序性,维持了在充放电过程中的层状结构的稳定性. 其它掺杂元素降低了材料结构的有序性,影响了其电化学性能. 说明形成完整的晶体结构是掺杂元素的选择依据.

关键词: 锂离子电池, 正极材料, 掺杂元素, 氧气压力, 电化学性能

Abstract: With doping different elements (M), a series of compounds LiNi0.8M0.2O2 used as cathode materials in lithium ion batteries were prepared by solid reaction under increased oxygen pressure. It was found that the doped Al, Mn and Ti can improve the properties in overcharge tolerance and cyclic capacity. The discharge capacity was almost kept constant after three cycles at high charging voltage ranging from 4.2 to 4.8 V. XRD and SEM analyses revealed that doping Al, Mn and Ti increased the orderness of the LiNiO2 material in the hexagonal phase and maintained the layered structure during the charging/discharging process. However, doping other elements decreased the orderness of the material structure, which clearly affected the electrochemical properties of the materials.

Key words: lithium ion battery, cathode material, doping, oxygen pressure, electrochemical properties

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