Conformal PEDOT Coating Enables Ultra-High-Voltage and High-Temperature Operation for Single-Crystal Ni-Rich Cathodes

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

33 Scopus Citations
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Author(s)

  • Qiang Liu
  • Yu-Tong Liu
  • Chen Zhao
  • Qing-Song Weng
  • Junjing Deng
  • Inhui Hwang
  • Yi Jiang
  • Chengjun Sun
  • Tianyi Li
  • Wenqian Xu
  • Ke Du
  • Amine Daali
  • Gui-Liang Xu
  • Khalil Amine

Detail(s)

Original languageEnglish
Pages (from-to)14527-14538
Journal / PublicationACS Nano
Volume16
Issue number9
Online published13 Sept 2022
Publication statusPublished - 27 Sept 2022
Externally publishedYes

Abstract

Single-crystal Ni-rich Li[NixMnyCo1-x-y]O(SC-NMC) cathodes represent a promising approach to mitigate the cracking issue of conventional polycrystalline cathodes. However, many reported SC-NMC cathodes still suffer from unsatisfactory cycling stability, particularly under high charge cutoff voltage and/or elevated temperature. Herein, we report an ultraconformal and durable poly(3,4-ethylenedioxythiophene) (PEDOT) coating for SC-NMC cathodes using an oxidative chemical vapor deposition (oCVD) technique, which significantly improves their high-voltage (4.6 V) and high-temperature operation resiliency. The PEDOT coated SC LiNi0.83Mn0.1Co0.07O(SC-NMC83) delivers an impressive capacity retention rate of 96.7% and 89.5% after 100 and 200 cycles, respectively. Significantly, even after calendar aging at 45 °C and 4.6 V, the coated cathode can still retain 85.3% (in comparison with 59.6% for the bare one) of the initial capacity after 100 cycles at a 0.5 C rate. Synchrotron X-ray experiments and interface characterization collectively reveal that the conformal PEDOT coating not only effectively stabilizes the crystallographic structure and maintains the integrity of the particles but also significantly suppresses the electrolyte's corrosion, resulting in improved electrochemical/thermal stability. Our findings highlight the promise of an oCVD PEDOT coating for single-crystal Ni-rich cathodes to meet the grand challenge of high-energy batteries under extreme conditions.

Research Area(s)

  • conformal PEDOT coating, high-temperature, high-voltage, Ni-rich NMC, oCVD, single-crystal

Citation Format(s)

Conformal PEDOT Coating Enables Ultra-High-Voltage and High-Temperature Operation for Single-Crystal Ni-Rich Cathodes. / Liu, Qiang; Liu, Yu-Tong; Zhao, Chen et al.
In: ACS Nano, Vol. 16, No. 9, 27.09.2022, p. 14527-14538.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review