Improvement of the cycling performance of LiNi0.6Co 0.2Mn0.2O2 cathode active materials by a dual-conductive polymer coating

Seo Hee Ju, Ik Su Kang, Yoon Sung Lee, Won Kyung Shin, Saheum Kim, Kyomin Shin, Dong Won Kim

Research output: Contribution to journalArticle

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Abstract

LiNi0.6Co0.2Mn0.2O2 cathode materials were surface-modified by coating with a dual conductive poly(3,4-ethylenedioxythiophene)-co-poly(ethylene glycol) (PEDOT-co-PEG) copolymer, and their resulting electrochemical properties were investigated. The surface-modified LiNi0.6Co0.2Mn0.2O 2 cathode material exhibited a high discharge capacity and good high rate performance due to enhanced transport of Li+ ions as well as electrons. The presence of a protective conducting polymer layer formed on the cathode also suppressed the growth of a resistive layer and inhibited the dissolution of transition metals from the active cathode materials, which resulted in more stable cycling characteristics than the pristine LiNi 0.6Co0.2Mn0.2O2 cathode material at 55 oC.

Original languageEnglish
Pages (from-to)2546-2552
Number of pages7
JournalACS Applied Materials and Interfaces
Volume6
Issue number4
DOIs
StatePublished - 2014 Feb 26

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Keywords

  • LiNiCo MnO
  • conductive polymer
  • cycling performance
  • protective coating
  • surface modification

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