Effect of structure on the Fe3+/Fe2+ redox couple in iron phosphates

A. K. Padhi; K. S. Nanjundaswamy; C. Masquelier; S. Okada; J. B. Goodenough

doi:10.1149/1.1837649

Effect of structure on the Fe³⁺/Fe²⁺ redox couple in iron phosphates

A. K. Padhi, K. S. Nanjundaswamy, C. Masquelier, S. Okada, J. B. Goodenough

Research output: Contribution to journal › Article › peer-review

1196 Citations (Scopus)

Abstract

To understand the role of structure on the position of the octahedral Fe³⁺/Fe²⁺ redox couple in compounds having the same polyanions, four iron phosphates: Li₃Fe₂(PO₄)₃, LiFeP₂O₇, Fe₄(P₂O₇)₃, and LiFePO₄ were investigated. They vary in structure as well as in the manner in which the octahedral iron atoms are linked to each other. The Fe³⁺/Fe²⁺ redox couple in the above compounds lies at 2.8, 2.9, 3.1, and 3.5 eV, respectively, below the Fermi level of lithium. The reason for the difference in the position of the redox couples is related to changes in the P-O bond lengths as well as to changes in the crystalline electric field at the iron sites.

Original language	English
Pages (from-to)	1609-1613
Number of pages	5
Journal	Journal of the Electrochemical Society
Volume	144
Issue number	5
DOIs	https://doi.org/10.1149/1.1837649
Publication status	Published - May 1997
Externally published	Yes

All Science Journal Classification (ASJC) codes

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

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1149/1.1837649

Cite this

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title = "Effect of structure on the Fe3+/Fe2+ redox couple in iron phosphates",

abstract = "To understand the role of structure on the position of the octahedral Fe3+/Fe2+ redox couple in compounds having the same polyanions, four iron phosphates: Li3Fe2(PO4)3, LiFeP2O7, Fe4(P2O7)3, and LiFePO4 were investigated. They vary in structure as well as in the manner in which the octahedral iron atoms are linked to each other. The Fe3+/Fe2+ redox couple in the above compounds lies at 2.8, 2.9, 3.1, and 3.5 eV, respectively, below the Fermi level of lithium. The reason for the difference in the position of the redox couples is related to changes in the P-O bond lengths as well as to changes in the crystalline electric field at the iron sites.",

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T1 - Effect of structure on the Fe3+/Fe2+ redox couple in iron phosphates

AU - Padhi, A. K.

AU - Nanjundaswamy, K. S.

AU - Masquelier, C.

AU - Okada, S.

AU - Goodenough, J. B.

PY - 1997/5

Y1 - 1997/5

N2 - To understand the role of structure on the position of the octahedral Fe3+/Fe2+ redox couple in compounds having the same polyanions, four iron phosphates: Li3Fe2(PO4)3, LiFeP2O7, Fe4(P2O7)3, and LiFePO4 were investigated. They vary in structure as well as in the manner in which the octahedral iron atoms are linked to each other. The Fe3+/Fe2+ redox couple in the above compounds lies at 2.8, 2.9, 3.1, and 3.5 eV, respectively, below the Fermi level of lithium. The reason for the difference in the position of the redox couples is related to changes in the P-O bond lengths as well as to changes in the crystalline electric field at the iron sites.

AB - To understand the role of structure on the position of the octahedral Fe3+/Fe2+ redox couple in compounds having the same polyanions, four iron phosphates: Li3Fe2(PO4)3, LiFeP2O7, Fe4(P2O7)3, and LiFePO4 were investigated. They vary in structure as well as in the manner in which the octahedral iron atoms are linked to each other. The Fe3+/Fe2+ redox couple in the above compounds lies at 2.8, 2.9, 3.1, and 3.5 eV, respectively, below the Fermi level of lithium. The reason for the difference in the position of the redox couples is related to changes in the P-O bond lengths as well as to changes in the crystalline electric field at the iron sites.

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