Low-Cost Al2O3 Coating Layer As a Preformed SEI on Natural Graphite Powder to Improve Coulombic Efficiency and High-Rate Cycling Stability of Lithium-Ion Batteries

Tianyu Feng, Youlong Xu, Zhengwei Zhang, Xianfeng Du, Xiaofei Sun, Lilong Xiong, Raul Rodriguez, Rudolf Holze

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Coulombic efficiency especially in the first cycle, cycling stability, and high-rate performance are crucial factors for commercial Li-ion batteries (LIBs). To improve them, in this work, Al2O3-coated natural graphite powder was obtained through a low-cost and facile sol-gel method. Based on a comparison of various coated amounts, 0.5 mol % Al(NO3)3 (vs mole of graphite) could bring about a smooth Al2O3 coating layer with proper thickness, which could act as a preformed solid electrolyte interface (SEI) to reduce the regeneration of SEI and lithium-ions consumption during subsequent cycling. Furthermore, we examined the advantages of Al2O3 coating by relating energy levels in LIBs using density functional theory calculations. Owing to its proper bandgap and lithium-ion conduction ability, the coating layer performs the same function as a SEI does, preventing an electron from getting to the outer electrode surface and allowing lithium-ion transport. Therefore, as a preformed SEI, the Al2O3 coating layer reduces extra cathode consumption observed in commercial LIBs.

Original languageEnglish
Pages (from-to)6512-6519
Number of pages8
JournalACS Applied Materials and Interfaces
Volume8
Issue number10
DOIs
Publication statusPublished - 16 Mar 2016
Externally publishedYes

Keywords

  • alumina coating
  • anodes
  • DFT calculations
  • energy levels
  • lithium-ion batteries
  • SEI

ASJC Scopus subject areas

  • Materials Science(all)

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