高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (4): 777-783.doi: 10.7503/cjcu20180683

• 物理化学 • 上一篇    下一篇

聚(3-己基噻吩)包覆富锂层状正极材料Li1.18Ni0.15Co0.15Mn0.52O2的制备与电化学性能

陈红1(), 杜勇慧2, 张鑫2, 刘文闫2, 周晓明2   

  1. 1. 北华大学理学院
    2. 材料科学与工程学院, 吉林 132013
  • 收稿日期:2018-10-10 出版日期:2019-04-03 发布日期:2019-01-24
  • 作者简介:

    联系人简介: 陈 红, 女, 博士, 教授, 主要从事功能材料方面的研究. E-mail: chlht518@163.com

  • 基金资助:
    国家自然科学基金(批准号: 51602006, 61604003)资助.

Preparation and Electrochemical Properties of Poly(3-hexylthiophene)-coated Lithium-rich Layered Cathode Material Li1.18Ni0.15Co0.15Mn0.52O2

CHEN Hong1,*(), DU Yonghui2, ZHANG Xin2, LIU Wenyan2, ZHOU Xiaoming2   

  1. 1. School of Science
    2. College of Materials Science and Engineering, Beihua University, Jilin 132013, China
  • Received:2018-10-10 Online:2019-04-03 Published:2019-01-24
  • Contact: CHEN Hong E-mail:chlht518@163.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos. 51602006, 61604003).

摘要:

采用溶胶-凝胶法合成了Li1.18Ni0.15Co0.15Mn0.52O2富锂层状正极材料, 并使用聚(3-己基噻吩)对其进行了表面包覆. 采用多种光谱学和电化学手段对材料的形貌结构和电化学性能进行了分析. 结果表明, 聚(3-己基噻吩)溶液浸泡后在富锂材料表面形成厚约1.5 nm的均匀包覆层. 表面包覆后富锂层状正极材料的极化和阻抗明显减小. 在0.2C倍率下, 经过100次充放电循环后, 未包覆的富锂材料放电比容量衰减为170 mA·h/g, 而经过0.3%聚(3-己基噻吩)包覆的材料的放电比容量则保持在205 mA·h/g, 容量保持率由68%提高到82%; 10C倍率下的放电比容量由72 mA·h/g提高到116 mA·h/g.

关键词: 锂离子电池, 正极材料, 表面包覆, 富锂材料, 聚(3-己基噻吩)

Abstract:

Lithium-rich layered cathode material Li1.18Ni0.15Co0.15Mn0.52O2 was synthesized by sol-gel method and then coated with poly(3-hexylthiophene). Varies spectroscopic and electrochemical techniques were used to analyze the morphology and electrochemical properties of the materials. The results showed that a homogeneous coating layer with a thickness of ca. 1.5 nm was formed on the surface of the material. The electrode polarization and impedance of the material were obviously reduced by surface coating. After 100 cycles at 0.2C, the specific capacity of the original material decreased to 170 mA·h/g, while that of the 0.3% poly(3-hexylthiophene) coated material still remained at 205 mA·h/g. The corresponding capacity retention increased from 68% to 82%. Moreover, the discharge capacity at 10C rate increased from 72 mA·h/g to 116 mA·h/g.

Key words: Lithium-ion battery, Cathode material, Surface coating, Li-rich material, Poly(3-hexylthiophene)

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