Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (4): 777.doi: 10.7503/cjcu20180683

• Physical Chemistry • Previous Articles     Next Articles

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).

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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