Studies on chromium/aluminium-doped manganese spinel as cathode materials for lithium-ion batteries-A novel chelated sol-gel synthesis

R. Thirunakaran, A. Sivashanmugam, S. Gopukumar, Charles W. Dunnill, Duncan H. Gregory

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Nanoparticles of LiMn2O4, LiCrxMn2-xO4 and LiAlxMn2-xO4 (x = 0.0-0.4) have been synthesized using either phthalic acid or fumaric acid as chelating agents, for the first time, through sol-gel method. These materials were characterized by thermo gravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Electrochemical performance of these materials was assessed to use as cathode material for lithium-ion batteries. XRD patterns ascertain the formation of the phase pure compounds. SEM images indicate the nanosized nature of the particles with uniform morphology and texture. Doping of Cr/Al with the spinel resulted to increased agglomeration. Cr-doped spinel delivers 138 mAh/g while Al-doped spinel exhibit 139 mAh/g at the first cycle reversible capacity. Doping of 0.1 Al spinel cells shows superior performance over the tested 10 cycles in terms of low capacity fading. Co-doped Li3-xCoxN (x = 0.40) has also been synthesized by solid-state method to use as anode material for lithium-ion batteries. Cells were assembled with the synthesized spinel cathodes and these cells delivered stable specific capacity with high columbic efficiency. Cyclic voltammograms of both spinels exhibit good oxidation and reduction peaks for Mn3+/Mn4+, Cr3+/Cr4+ and Al+/Al3+.

Original languageEnglish
Pages (from-to)520-531
Number of pages12
JournalJournal of Materials Processing Technology
Volume208
Issue number1-3
DOIs
Publication statusPublished - Nov 21 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Computer Science Applications
  • Metals and Alloys
  • Industrial and Manufacturing Engineering

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