Enhanced electrochemical properties of surface modified limn 2O4 by Li-Fe composites for rechargeable lithium ion batteries

Jin Yi Shi, Cheol Woo Yi, Lianhua Liang, Keon Kim

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The surface modified Mn2O4 materials with Li-Fe composites were prepared by a sol-gel method to improve the electrochemical performance of Mn2O4 and were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), and transmission electron microscopy (TEM)-EDS. XRD results indicate that all the samples (modified and pristine samples) have cubic spinel structures, and XRD, XPS, and TEM-EDS data reveal the formation of Li(LixFexMn2-2x)O4 solid solution on the surface of particles. For the electrochemical properties, the modified material demonstrated dramatically enhanced reversibility and stability even at elevated temperature. These improvements are attributed to the formation of the solid solution, and thus-formed solid solution phase on the surface of Mn2O4 particle reduces the dissolution of Mn ion and suppresses the Jahn-Teller effect.

Original languageEnglish
Pages (from-to)309-314
Number of pages6
JournalBulletin of the Korean Chemical Society
Volume31
Issue number2
DOIs
Publication statusPublished - 2010 Feb

Keywords

  • Lithium ion batteries
  • Lithium manganese oxide
  • Solid solution
  • Spinel
  • Surface modification

ASJC Scopus subject areas

  • Chemistry(all)

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