Synthesis, Structure, and Electrochemical Properties of LiFeV2O7
| Autor: | Yasmine Benabed, Mickaël Dollé, Nicolas Penin, Jacques Darriet, Laurent Castro |
|---|---|
| Přispěvatelé: | Laboratory of Chemistry and Electrochemistry of Solids, Université de Montréal (UdeM), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB), Y.B. and M.D. acknowledge the financial support from Natural Sciences and Engineering Research Council of Canada (NSERC) through a Discovery grant. |
| Rok vydání: | 2017 |
| Předmět: |
Diffraction
Materials science General Chemical Engineering Vanadium chemistry.chemical_element [CHIM.MATE]Chemical Sciences/Material chemistry 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences Ion Crystallography chemistry Group (periodic table) Phase (matter) Materials Chemistry Perpendicular 0210 nano-technology Monoclinic crystal system |
| Zdroj: | Chemistry of Materials Chemistry of Materials, American Chemical Society, 2017, 29 (21), pp.9292-9299. ⟨10.1021/acs.chemmater.7b03271⟩ |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/acs.chemmater.7b03271 |
| Popis: | International audience; The structure of a novel compound, LiFeV2O7, has been determined from single-crystal X-ray diffraction data. The phase crystallizes in the non-centrosymmetric monoclinic Cc space group. The structure can be described as a layered type compound alternating (Li,Fe)–O sheets and V–O chains that are perpendicular to the [101] direction. Within the (Li,Fe)–O sheets, “hexagonal” holes are formed and assembled into tunnels running parallel to the [201] direction and hosting the vanadium atoms. Original (V4O14)8– strings are observed within the structure in association with well-known (V2O7)4– pyrovanadate units. Both units alternate parallel to the [−101] direction. LiFeV2O7 displays a reversible insertion–deinsertion mechanism for Li+ ions. The theoretical capacity for the insertion of one Li+ into LiFeV2O7 reaches 97 mAh/g. When the compound is cycled between 3.50 and 2.35 V versus Li+/Li, the electrochemical curve displays an initial capacity of 100 mAh/g, with 85% of this capacity retained after 60 cycles. No evidence of the formation of Fe4+ upon oxidation to a high voltage was observed. LiFeV2O7 represents the first reported phase in the Li2O–Fe2O3–V2O5 ternary diagram with electrochemical activities. |
| Databáze: | OpenAIRE |
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