Effective Li3AlF6Surface Coating for High-Voltage Lithium-Ion Battery Operation

Hiroaki Kobayashi, Guohao Yuan, Yoshiyuki Gambe, Itaru Honma

Research output: Contribution to journalArticlepeer-review

Abstract

Enhancing the energy density of high-voltage lithium-ion battery cathodes is challenging. Cathode surface coating can effectively suppress the irreversible side reactions occurring at the cathode/electrolyte interface. Recent high-throughput theoretical studies have demonstrated the potential of a ternary lithium fluoride, β-Li3AlF6, as a coating agent owing to its high anodic limit, sufficient stability against various cathode materials, and sufficient Li+-ion conductivity. This study improves the cathode performance by the surface coating of β-Li3AlF6 on LiNi0.5Mn1.5O4 and LiCoO2 cathodes using a simple sol-gel calcination process. β-Li3AlF6-coated LiNi0.5Mn1.5O4 shows superior cycle performance, with a capacity retention of 98.2% and a coulombic efficiency of 99% at the 100th cycle. Further, β-Li3AlF6-coated LiCoO2 can be cycled at a high voltage of 4.5 V with a capacity retention of 95% at the 100th cycle. These results demonstrate the potential of β-Li3AlF6 as a high-voltage cathode coating agent.

Original languageEnglish
Pages (from-to)9866-9870
Number of pages5
JournalACS Applied Energy Materials
Volume4
Issue number9
DOIs
Publication statusPublished - 2021 Sep 27

Keywords

  • LiAlF
  • high-voltage cathode material
  • lithium-ion battery
  • surface coating
  • ternary lithium fluoride

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Electrical and Electronic Engineering
  • Materials Chemistry

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