Improved electrochemical performance of AlPO4-coated LiMn1.5Ni0.5O4 electrode for lithium-ion batteries

Jin Yi Shi, Cheol Woo Yi, Keon Kim

Research output: Contribution to journalArticle

105 Citations (Scopus)

Abstract

LiMn1.5Ni0.5O4 materials coated with AlPO4 are prepared by a sol-gel method with citric acid to improve their electrochemical performance; the physical and electrochemical properties are characterized by various analytical techniques. The coated AlPO4 layer completely covers the surfaces of the LiMn1.5Ni0.5O4 particles and the thickness of the coated layer is ∼15 nm. 1 wt.% AlPO4-coated LiMn1.5Ni0.5O4 has much lower surface and charge-transfer resistances and shows a higher lithium diffusion rate in comparison with the pristine sample. The modified material demonstrates dramatically enhanced electrochemical reversibility and stability under elevated temperature conditions. This is because the coated AlPO4 layer reduces the contact area between the electrode and electrolyte and suppresses the formation of undesirable solid electrolyte interface films.

Original languageEnglish
Pages (from-to)6860-6866
Number of pages7
JournalJournal of Power Sources
Volume195
Issue number19
DOIs
Publication statusPublished - 2010 Oct 1

Keywords

  • Cathode
  • Coating
  • Lithium-ion battery
  • Surface modification

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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