WINDMÜLLER, Anna; RENZI, Tatiana; KUNGL, Hans; TARANENKO, Svitlana; SUARD, Emmanuelle; FAUTH, François; DUTTINE, Mathieu; TSAI, Chih-Long; SUN, Ruoheng; DURMUS, Yasin Emre; TEMPEL, Hermann; JAKES, Peter; MASQUELIER, Christian; EICHEL, Rüdiger-A.; CROGUENNEC, Laurence; EHRENBERG, Helmut

doi:10.1149/1945-7111/ac7ef8

Metadatos

Licencia de uso del documento

WINDMÜLLER, Anna
Institute of Energy and Climate Research - Fundamental Electrochemistry [ IEK-9]

RENZI, Tatiana
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Laboratoire réactivité et chimie des solides - UMR CNRS 7314 UPJV [LRCS]
Institut Laue-Langevin [ILL]

KUNGL, Hans
Institute of Energy and Climate Research - Fundamental Electrochemistry [ IEK-9]

Idioma

Article de revue

Este ítem está publicado en

Journal of The Electrochemical Society. 2022-07-15, vol. 169, n° 7, p. 070518 (11 p.)

Electrochemical Society

Resumen en inglés

Positive electrodes with high energy densities for Lithium-ion batteries (LIB) almost exclusively rely on toxic and costly transition metals. Iron based high voltage spinels can be feasible alternatives, but the phase stabilities and optimal chemistries for LIB applications are not fully understood yet. In this study, LiFe x Mn 2-x O 4 spinels with x = 0.2 to 0.9 were synthesized by solid-state reaction at 800 °C. High-resolution diffraction methods reveal gradual increasing partial spinel inversion as a function of x and early secondary phase formation. Mössbauer spectroscopy was used to identify the Fe valences, spin states and coordination. The unexpected increasing lattice parameters with Fe substitution for Mn was explained considering the anion-cation average bond lengths determined by Rietveld analysis and Mn 3+ overstoichiometries revealed by cyclic voltammetry. Finally, galvanostatic cycling of Li-Fe-Mn-spinels shows that the capacity fading is correlated to increased cell polarization for higher upper charging cut-off voltage, Fe-content and C-rate. The electrolyte may also contribute significantly to the cycling limitations.< Leer menos

DOI

http://dx.doi.org/10.1149/1945-7111/ac7ef8

Proyecto ANR

Laboratory of excellency for electrochemical energy storage

Orígen

Importado de Hal

Centros de investigación

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026