Polyvinylpyrrolidone-Induced Uniform Surface-Conductive Polymer Coating Endows Ni-Rich LiNi0.8Co0.1Mn0.1O2 with Enhanced Cyclability for Lithium-Ion Batteries

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

4 Scopus Citations
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Author(s)

  • Qingmeng Gan
  • Ning Qin
  • Youhuan Zhu
  • Zixuan Huang
  • Fangchang Zhang
  • Shuai Gu
  • Jiwei Xie
  • Li Lu
  • Zhouguang Lu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)12594–12604
Journal / PublicationACS Applied Materials and Interfaces
Volume11
Issue number13
Early online date12 Mar 2019
Publication statusPublished - 3 Apr 2019

Abstract

The Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode has attracted great interest owing to its low cost, high capacity, and energy density. Nevertheless, rapid capacity fading is a critical problem because of direct contact of NCM811 with electrolytes and hence restrains its wide applications. To prevent the direct contact, the surface inert layer coating becomes a feasible strategy to tackle this problem. However, to achieve a homogeneous surface coating is very challenging. Considering the bonding effect between NCM811, polyvinylpyrrolidone (PVP), and polyaniline (PANI), in this work, we use PVP as an inductive agent to controllably coat a uniform conductive PANI layer on NCM811 (NCM811@PANI-PVP). The coated PANI layer not only serves as a rapid channel for electron conduction, but also prohibits direct contact of the electrode with the electrolyte to effectively hinder side reaction. NCM811@PANI-PVP thus exhibits excellent cyclability (88.7% after 100 cycles at 200 mA g-1) and great rate performance (152 mA h g-1 at 1000 mA g-1). In situ X-ray diffraction and in situ Raman are performed to investigate the charge-discharge mechanism and the cyclability of NCM811@PANI-PVP upon electrochemical reaction. This surfactant-modulated surface uniform coating strategy offers a new modification approach to stabilize Ni-rich cathode materials for lithium-ion batteries.

Research Area(s)

  • conductive polymer, excellent cyclability, Ni-rich cathode, surfactant inductive agent, uniform surface coating

Citation Format(s)

Polyvinylpyrrolidone-Induced Uniform Surface-Conductive Polymer Coating Endows Ni-Rich LiNi0.8Co0.1Mn0.1O2 with Enhanced Cyclability for Lithium-Ion Batteries. / Gan, Qingmeng; Qin, Ning; Zhu, Youhuan; Huang, Zixuan; Zhang, Fangchang; Gu, Shuai; Xie, Jiwei; Zhang, Kaili; Lu, Li; Lu, Zhouguang.

In: ACS Applied Materials and Interfaces, Vol. 11, No. 13, 03.04.2019, p. 12594–12604.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review