Isothermal calorimetry investigation of Li1+xMn2-yAlzO4 spinel

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

Research output: Contribution to journalArticle

39 Citations (Scopus)

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
Externally publishedYes

Fingerprint

Calorimetry
Lithium
Order disorder transitions
Aluminum
Doping (additives)
Heat generation
Calorimeters
Cathodes
Thermodynamic stability
Entropy
Phase transitions
spinell
Scanning
Temperature
lithium manganese oxide
Hot Temperature

Keywords

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

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

Cite this

Isothermal calorimetry investigation of Li1+xMn2-yAlzO4 spinel. / Lu, W.; Belharouak, I.; Park, S. H.; Sun, Y. K.; Amine, K.

In: Electrochimica Acta, Vol. 52, No. 19, 25.05.2007, p. 5837-5842.

Research output: Contribution to journalArticle

Lu, W. ; Belharouak, I. ; Park, S. H. ; Sun, Y. K. ; Amine, K. / Isothermal calorimetry investigation of Li1+xMn2-yAlzO4 spinel. In: Electrochimica Acta. 2007 ; Vol. 52, No. 19. pp. 5837-5842.
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