FeSi4P4: A novel negative electrode with atypical electrochemical mechanism for Li and Na-ion batteries

Gaël Coquil, Julien Fullenwarth, Gal Grinbom, Moulay Tahar Sougrati, Lorenzo Stievano, David Zitoun, Laure Monconduit

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The electrochemical mechanism and performance of FeSi4P4, vs. Na and Li were studied using a combination of operando X-ray diffraction, 57Fe Mössbauer spectroscopy, and SQUID magnetometry. This silicon- and phosphorous-rich material exhibits a high capacity of 1750 mAh/g, retaining 1120 mAh/g after 40 cycles, and reacts through an original reversible mechanism surprisingly involving only slight changes in the chemical environment of the iron. Magnetic measurements and 57Fe Mössbauer spectroscopy at low temperature reveal the reversible but incomplete change of the magnetic moment upon charge and discharge. Such a mild reversible process without drastic phase transition (with the exception of the crystalline to amorphous transition during the first lithiation) can explain the satisfying capacity retention. The electrochemical mechanism appears thus to be significantly different from the classical conversion or alloying/dealloying mechanisms usually observed in Lithium ion batteries for p-group element based materials. The same iron silicon phosphide electrode shows also interesting but significantly lower performance vs. Na, with a limited capacity retention 350 mAh/g.

Original languageEnglish
Pages (from-to)196-203
Number of pages8
JournalJournal of Power Sources
Volume372
DOIs
StatePublished - 31 Dec 2017

Bibliographical note

Publisher Copyright:
© 2017 Elsevier B.V.

Funding

This work was supported by the High Council for Scientifc and Technological Cooperation between France and Israel ( PRC MoST 264763 ). The RS2E (Réseau sur le Stockage Electrochimique del’Energie) network is acknowledged for the financial support of this work ( ANR-10-LABX-76-01 ).

FundersFunder number
High Council for Scientifc and Technological Cooperation between France and IsraelPRC MoST 264763, ANR-10-LABX-76-01

    Keywords

    • Li-ion batteries
    • Magnetic properties
    • Mechanism
    • Mössbauer spectroscopy
    • Operando measurements
    • Phosphides
    • Silicides
    • X-ray diffraction

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