Electrochemical and thermal investigation of Li4/3 Ti 5/3O4 spinel

W. Lu, I. Belharouak, J. Liu, K. Amine

Research output: Contribution to journalArticle

88 Citations (Scopus)

Abstract

We have studied the electrochemical and thermal properties of Li43 Ti53 O4 spinel as a promising anode material for lithium ion batteries. The spinel/rock-salt two-phase transition process was interpreted using a core-shell model, which provided a good explanation of the different area-specific impedance behaviors during the charge and discharge processes. The constant dE/dT during the spinel/rock-salt phase transition was calculated from the heat-flow profile by isothermal microcalorimeter results and found to be around -0.04 mVK. This very low and constant entropy change indicates that Li43 Ti53 O4 is a good anode material in terms of thermal stability. Also, we propose that there is a new phase generation when more than one lithium atom is inserted into Li43 Ti53 O4. According to the discontinuity of dE/dT results, the order/disorder transition at the low-voltage region (around 0.6 V vs Li) occurs during further lithium insertion.

Original languageEnglish
Pages (from-to)A114-A118
JournalJournal of the Electrochemical Society
Volume154
Issue number2
DOIs
Publication statusPublished - 19 Jan 2007

    Fingerprint

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this