Suppression of Structural Fatigue by Doping in Spinel Electrode Probed by In Situ Bending Beam Method

Kyung Yoon Chung, Won Sub Yoon, Kwang Bum Kim, Xiao Qing Yang, Seung Mo Oh

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The onset of a Jahn-Teller effect at the surface of LiMn2O 4 particles during cycling in the 4 V range was previously reported to be one of the causes for the capacity fading. Furthermore, it has been reported that the Jahn-Teller effect in the 4 V range may be suppressed by the substitution of the Mn ions by either Li or other transition metal ions. However, no direct evidence has yet been reported. This study provides evidence for the onset of a Jahn-Teller effect in thin film 4 V LiMn2O 4 and its suppression caused by substituting the Mn ions with Co 3+ and Ni2+ ions using in situ bending beam method (BBM). The deflectograms are measured simultaneously with galvanostatic charge/discharge or cyclic voltammograms, and the onset of the Jahn-Teller effect is investigated by means of the differential strain peak which is observed at around 3.90-3.95 V during cyclic voltammetry, and the slope variation observed in the strain curves during galvanostatic charge/discharge. The suppression of the Jahn-Teller effect in the doped spinel leads to the magnitude of the differential strain peak resulting from the Jahn-Teller effect being reduced in comparison with the other two pairs of peaks, which correspond to the current peaks of the cyclic voltammogram.

Original languageEnglish
Pages (from-to)A484-A492
JournalJournal of the Electrochemical Society
Volume151
Issue number3
DOIs
Publication statusPublished - 2004 Apr 14

Fingerprint

fatigue (materials)
Jahn-Teller effect
spinel
Doping (additives)
retarding
Fatigue of materials
Electrodes
electrodes
Ions
ions
fading
Cyclic voltammetry
Transition metals
Metal ions
spinell
metal ions
Substitution reactions
transition metals
substitutes
slopes

All Science Journal Classification (ASJC) codes

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

Cite this

Chung, Kyung Yoon ; Yoon, Won Sub ; Kim, Kwang Bum ; Yang, Xiao Qing ; Oh, Seung Mo. / Suppression of Structural Fatigue by Doping in Spinel Electrode Probed by In Situ Bending Beam Method. In: Journal of the Electrochemical Society. 2004 ; Vol. 151, No. 3. pp. A484-A492.
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Suppression of Structural Fatigue by Doping in Spinel Electrode Probed by In Situ Bending Beam Method. / Chung, Kyung Yoon; Yoon, Won Sub; Kim, Kwang Bum; Yang, Xiao Qing; Oh, Seung Mo.

In: Journal of the Electrochemical Society, Vol. 151, No. 3, 14.04.2004, p. A484-A492.

Research output: Contribution to journalArticle

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