Enhanced Electrochemical Performance of LiNi0.8Co0.1Mn0.1O2 with SiO2 Surface Coating Via Homogeneous Precipitation

Lintao Dou, Pu Hu, Chaoqun Shang, Heng Wang, Dongdong Xiao, Utkarsh Ahuja, Katerina Aifantis, Zhanhui Zhang, Zhiliang Huang

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM811) has been considered as a promising cathode material for high energy density lithium-ion batteries. However, it experiences undesirable interfacial side-reactions with the electrolyte, which lead to a rapid capacity decay. In this work, a homogeneous precipitation method is proposed for forming a uniform silicon dioxide (SiO2) coating on the NCM811 surface. The strong Si−O network provided a stable protective layer between the NCM811 active material and electrolyte to improve the electrochemical stability. As a result, the NCM811@SiO2 cathode showed superior cycling stability (84.9 % after 100 cycles at 0.2 C) and rate capability (142.7 mA h g−1 at 5 C) compared to the pristine NCM811 cathode (56.6 % after 100 cycles, 127.9 mA h g−1 at 5 C). Moreover, the SiO2 coating effectively suppressed voltage decay and pulverization of the NCM811 particles during long term cycling. This uniform coating technique offers a viable approach for stabilizing Ni-rich cathode materials for high-energy density lithium-ion batteries.

Original languageEnglish (US)
Pages (from-to)4321-4327
Number of pages7
JournalChemElectroChem
Volume8
Issue number22
DOIs
StatePublished - Nov 12 2021

Keywords

  • Homogeneous precipitation
  • LiNiCoMnO
  • Lithium-ion battery
  • cathode materials
  • coating

ASJC Scopus subject areas

  • Catalysis
  • Electrochemistry

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