Abnormal operando structural behavior of sodium battery material

Influence of dynamic on phase diagram of NaxFePO4

J. Gaubicher, F. Boucher, P. Moreau, Marine Cuisinier, P. Soudan, E. Elkaim, D. Guyomard

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

This study conveys striking findings regarding the operando structural behavior of the Na/FePO4 system during a charge and discharge cycle. From Rietveld refinements of synchrotron operando X-ray diffraction data, it appears that the active material presents large, non-stoichiometric domains while undergoing structural phase transformation. The corresponding extended limits of solubility are characterized by continuous variations in the metrics that mirror the entry of Na occupancy values into thermodynamically forbidden regions. A major consequence of this smoothed phase transformation is a significant decrease in the lattice volume mismatch, which could well compensate for the less efficient Na-based systems with respect to SEI and adverse effect of cation size in comparison to Li batteries. Comparison of the lattice volume mismatch on charge and discharge revealed an explanation for the asymmetry of the electrochemical curve.

Original languageEnglish
Pages (from-to)104-106
Number of pages3
JournalElectrochemistry Communications
Volume38
DOIs
Publication statusPublished - Jan 2014
Externally publishedYes

Fingerprint

Phase diagrams
Phase transitions
Sodium
Rietveld refinement
Synchrotrons
Cations
Mirrors
Solubility
Positive ions
X ray diffraction
ferric phosphate

Keywords

  • Na-ion battery
  • NaFePO
  • Olivine
  • Operando XRD

ASJC Scopus subject areas

  • Electrochemistry

Cite this

Abnormal operando structural behavior of sodium battery material : Influence of dynamic on phase diagram of NaxFePO4. / Gaubicher, J.; Boucher, F.; Moreau, P.; Cuisinier, Marine; Soudan, P.; Elkaim, E.; Guyomard, D.

In: Electrochemistry Communications, Vol. 38, 01.2014, p. 104-106.

Research output: Contribution to journalArticle

Gaubicher, J. ; Boucher, F. ; Moreau, P. ; Cuisinier, Marine ; Soudan, P. ; Elkaim, E. ; Guyomard, D. / Abnormal operando structural behavior of sodium battery material : Influence of dynamic on phase diagram of NaxFePO4. In: Electrochemistry Communications. 2014 ; Vol. 38. pp. 104-106.
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