Isothermal calorimetry investigation of Li1+xMn2-yAlzO4 spinel

W. Lu, I. Belharouak, S. H. Park, Y. K. Sun, K. Amine

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Abstract

The heat generation of LiMn2O4, Li1.156Mn1.844O4, and Li1.06Mn1.89Al0.05O4 spinel cathode materials in a half-cell system was investigated by isothermal micro-calorimetry (IMC). The heat variations of the Li/LiMn2O4 cell during charging were attributed to the LiMn2O4 phase transition and order/disorder changes. This heat variation was largely suppressed when the stoichiometric spinel was doped with excess lithium or lithium and aluminum. The calculated entropy change (dE/dT) from the IMC confirmed that the order/disorder change of LiMn2O4, which occurs in the middle of the charge, was largely suppressed with lithium or lithium and aluminum doping. The dE/dT values obtained did not agree between the charge and the discharge at room temperature (25 °C), which was attributed to cell self-discharge. This discrepancy was not observed at low temperature (10 °C). Differential scanning calorimeter (DSC) results showed that the fully charged spinel with lithium doping has better thermal stability.

Original languageEnglish
Pages (from-to)5837-5842
Number of pages6
JournalElectrochimica Acta
Volume52
Issue number19
DOIs
Publication statusPublished - 25 May 2007

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Keywords

  • Calorimetry
  • Doping
  • Entropy change
  • Lithium ion batteries
  • Manganese spinel
  • Thermal safety

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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