Electrochemical and structural study of the 3.3 V reduction step in defective LixMn2O4 and LiMn2O(4-y)Py compounds

M. R. Palacín, G. G. Amatucci, M. Anne, Y. Chabre, L. Seguin, P. Strobel, J. M. Tarascon, G. Vaughan

Research output: Contribution to journalConference article

21 Scopus citations

Abstract

Non-stoichiometric or fluorine-substituted LixMn2O4 are known to present a reversible redox step at 4.5 V as well as a reduction step at 3.3 V appearing to the expense of the usual 4.0-4.15 V. We present results of very slow stepwise potentiodynamic studies which allowed to localise the oxidation step associated to the 3.3 V reduction level close to 3.95 V. We propose the cubic spinel lattice parameter value as the key parameter for knowing a priori if these redox states will be present or not, with 8.215 Å as threshold value. In situ XRD studies performed across the 3.3 ↔ 3.95 V redox step indicate that these additional states are probably associated to structural features.

Original languageEnglish (US)
Pages (from-to)627-631
Number of pages5
JournalJournal of Power Sources
Volume81-82
DOIs
StatePublished - Sep 1999
Externally publishedYes
EventProceedings of the 1998 Ninth International Meeting on Lithium Batteries - Edingburgh, United Kingdom
Duration: Jul 12 1998Jul 17 1998

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Keywords

  • Electrochemical potential spectroscopy
  • In situ XRD
  • LiMnO
  • LiMnOF

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