应用化学 ›› 2022, Vol. 39 ›› Issue (8): 1209-1215.DOI: 10.19894/j.issn.1000-0518.210543

• 研究论文 • 上一篇    下一篇

高比容量锂离子电池正极材料LiNi0.6Co0.2Mn0.2O2的制备及性能

王恩通(), 杨林芳   

  1. 吕梁学院化学化工系,吕梁 033001
  • 收稿日期:2021-11-22 接受日期:2022-02-17 出版日期:2022-08-01 发布日期:2022-08-04
  • 通讯作者: 王恩通
  • 基金资助:
    山西省高等学校科技创新项目(2020L0681);吕梁市重点研发项目(2019GYGG-89)

Preparation and Properties of LiNi0.6Co0.2Mn0.2O2 Cathode Material for High Specific Capacity Lithium Ion Battery

En-Tong WANG(), Lin-Fang YANG   

  1. Department of Chemistry and Chemical Engineering,Lvliang University,Lvliang 033000,China
  • Received:2021-11-22 Accepted:2022-02-17 Published:2022-08-01 Online:2022-08-04
  • Contact: En-Tong WANG
  • About author:1683190608@qq.com
  • Supported by:
    the Science and Technology Innovation Project of Colleges and Universities in Shanxi Province(2020L0681);the Key R&D Project of Luliang City(2019GYGG-89)

摘要:

以LiNi0.6Co0.2Mn0.2O2为研究对象,通过共沉淀法制备了不同F物质的量分数(0%、1%、3%、5%)的LiNi0.6Co0.2Mn0.2O2三元正极材料(NCM),通过对NCM材料的晶格结构、微观形貌、电化学性能进行分析,结果表明:F掺杂后提高了NCM材料的结晶度,降低了阳离子混乱程度,适量的F掺杂有助于减小NCM三元正极材料的尺寸和提高均匀性,F的掺杂还能够降低NCM三元正极材料的极化现象,初始放电比容量随着F的掺杂含量升高呈现出先升高后降低的趋势,循环性能随着F的掺杂得到了提高,F掺杂物质的量分数为3%的NCM三元正极材料初始放电比容量167.2 mA·h/g,容量保持率达到98.5%,阻抗较小,电化学性能最优。

关键词: 锂离子电池, 正极材料, LiNi0.6Co0.2Mn0.2O2, F掺杂, 比容量, 容量保持率

Abstract:

This article takes LiNi0.6Co0.2Mn0.2O2 as the research object, and LiNi0.6Co0.2Mn0.2O2 ternary cathode materials (NCM) with different F element molar doping amounts (0%, 1%, 3%, 5%) are prepared by a co-precipitation method. The analysis of the lattice structure, microscopic morphology, and electrochemical properties of the NCM material reveals that the F doping improves the crystallinity of the NCM material and reduces the degree of cation disorder. A proper amount of F doping impurities help reduce the size of the NCM ternary cathode material and improve the uniformity. The doping of F can also reduce the polarization phenomenon of the NCM ternary cathode material. The initial discharge specific capacity increases first and then decreases with the increase of the doping content of F. The cycle performance is obtained with the doping of F. The NCM ternary cathode material with 3% F doping content has an initial discharge specific capacity of 167.2 mA·h/g, a capacity retention rate of 98.5%, low impedance, and optimal electrochemical performance.

Key words: Lithium Ion Battery, Cathode material, LiNi0.6Co0.2Mn0.2O2, F doping, Specific capacity, Capacity retention rate

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