Two-step carbon coating onto nickel-rich LiNi0.8Co0.1Mn0.1O2 cathode reduces adverse phase transition and enhances electrochemical performance

Mengyuan Wang, Xiaosong Zhang, Ziyin Guo, Chunhua Chen, Jiashu Yuan*, Yongdan Li, Yonggao Xia, Ya Jun Cheng*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

High-nickel ternary cathode materials such as LiNi0.8Co0.1Mn0.1O2 (NCM811) are among the most promising cathode materials due to their high capacity and low cost. However, irreversible phase transition and interfacial side reactions over cycles remain critical concerns. In this paper, a two-step carbon coating process is developed to suppress the adverse phase transition and excessive side reactions at the electrode-electrolyte interface. Sucrose is melted firstly at mild temperature to be coated onto the particle surface, which is converted into carbon in situ at elevated temperature under oxygen atmosphere. Both the cyclic (96.7% capacity retention after 100 cycles at 1 C) and rate performance (130 mAh g1 at 5 C) of the NCM811 cathode are effectively improved by the carbon coating treatment.

Original languageEnglish
Article number142339
JournalElectrochimica Acta
Volume454
Early online date14 Apr 2023
DOIs
Publication statusPublished - 20 Jun 2023
MoE publication typeA1 Journal article-refereed

Keywords

  • Carbon coating
  • Cation mixing
  • Lithium-ion batteries
  • Nickel-rich cathodes
  • Phase transition

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