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Reversible Sodium and Lithium Insertion in Iron Fluoride Perovskites
Author(s) -
Martin Andréa,
Doublet MarieLiesse,
Kemnitz Erhard,
Pinicola
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201802057
Subject(s) - materials science , ion , electrochemistry , sodium , lithium (medication) , rutile , fluoride , nanoparticle , chemical engineering , inorganic chemistry , nanotechnology , electrode , chemistry , organic chemistry , medicine , engineering , metallurgy , endocrinology
Li‐ion batteries are omnipresent in consumer electronics and are seen as the most promising technology for electric vehicles. Na‐ion batteries have emerged as viable and cheaper alternatives for stationary applications where Li‐ion batteries are too expensive. However, the larger size of sodium ion compared to lithium makes traditional positive materials for Li‐ion batteries not always suitable for the reversible insertion of sodium ions. Herein, a microwave‐assisted solution synthesis of NaFeF 3 perovskite nanoparticles from presynthesized rutile FeF 2 colloidal particles, sodium ethoxide, and ammonium fluoride is presented. This NaFeF 3 material shows a reversible electrochemical activity of 1Na or 1Li per iron with low polarization and excellent capacity retention after 100 cycles. The unexpected reversible insertion of both sodium and lithium ions, herein studied through ex situ and operando X‐ray diffraction measurements, is attributed to a kinetic stabilization of corner‐shared cubic A x FeF 3 (A = Li, Na) frameworks along the cycles involving low volume change without high thermodynamic cost as supported by a polymorphism theoretical analysis.