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 ›› 2016, Vol. 48 ›› Issue (8): 79-.

• 论文 • 上一篇    

MgF2包覆对正极材料LiNi1/3Co1/3Mn1/3O2性能的影响

夏继平,李晓云,郭秋双   

  1. 中海油天津化工研究设计院,天津 300131
  • 出版日期:2016-08-10 发布日期:2016-08-10

Effect of MgF2-coating on performance of LiNi1/3Co1/3Mn1/3O2 cathode materials

 XIA  Ji-Ping, LI  Xiao-Yun, GUO  Qiu-Shuang   

  1. CenerTech Tianjin Chemical Research and Design Institute Co.,Ltd.,Tianjin 300131,China
  • Online:2016-08-10 Published:2016-08-10

摘要: 通过浸渍法在正极材料LiNi1/3Co1/3Mn1/3O2的表面包覆MgF2,通过XRD、SEM、交流阻抗(EIS)分析、充放电测试研究了不同量MgF2包覆对LiNi1/3Co1/3Mn1/3O2正极材料的结构与电化学性能的影响。结果表明,MgF2以非晶态形式包覆于LiNi1/3Co1/3Mn1/3O2材料颗粒的表面,当包覆量为3%(物质的量分数,下同)时,三元正极材料具有优良的电化学性能,在3.0~4.6 V充放电范围内0.1C充放电倍率下,首次放电比容量为196.3 mA·h/g,1C循环50次后容量保持率为95.7%,55 ℃高温下1C循环50次后容量保持率为93.3%。

关键词: 锂离子电池, 正极材料, LiNi1/3Co1/3Mn1/3O2, MgF2, 包覆

Abstract: MgF2-coated LiNi1/3Co1/3Mn1/3O2 cathode materials were synthesized by impregnation method.The effects of amounts of MgF2 coating on the structure,morphology,and electrochemical properties of LiNi1/3Co1/3Mn1/3O2  were analyzed by XRD,SEM,charge-discharge tests,and electrochemical impedance spectra(EIS),respectively.Results showed that the uncrystalline MgF2 uniformly distributed on the surface of the LiNi1/3Co1/3Mn1/3O2  particles.The sample with 3%(amount-of-substance frac- tion,same below) MgF2 coating showed excellent electrochemical properties.Between 3.0~4.6 V,at 0.1C,the sample of above-mentioned exhibited a initial discharge capacity of 196.3 mA·h/g.At 1C,it maintained 95.7% of the initial capacity af- ter 50 cycles,and 93.3% capacity retention after 50 cycles at 55 ℃.

Key words: lithium ion batteries, cathode material, LiNi1/3Co1/3Mn1/3O2, MgF2, coating

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