Open AccessIonothermal Synthesis of Polyanionic Electrode Material Na3V2(PO4)2FO2 through a Topotactic Reaction
Author(s) -
Jacob Olchowka,
Long H. B. Nguyen,
Emmanuel Petit,
Paula Sanz Camacho,
Christian Masquelier,
Dany Carlier,
Laurence Croguennec
Publication year - 2020
Publication title -
inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 233
eISSN - 1520-510X
pISSN - 0020-1669
DOI - 10.1021/acs.inorgchem.0c02546
Subject(s) - chemistry , ionic liquid , electrochemistry , stoichiometry , scanning electron microscope , imide , reaction mechanism , electrode , solid state , crystallography , chemical engineering , inorganic chemistry , nuclear chemistry , polymer chemistry , organic chemistry , catalysis , physics , quantum mechanics , engineering
Polyanionic Na 3 V 2 (PO 4 ) 2 FO 2 has been successfully prepared for the first time by ionothermal reaction in 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIM TFSI) ionic liquid. Its structure and elemental stoichiometry are confirmed by X-ray diffraction, NMR spectroscopy, and ICP-OES, respectively. Furthermore, the scanning electron microscopy reveals that the as-obtained material possesses an original platelet-like morphology. A topochemical reaction mechanism is proposed to explain the formation of the 3D framework of Na 3 V 2 (PO 4 ) 2 FO 2 from layered compound α-VOPO 4 ·2H 2 O. Galvanostatic electrochemical tests indicate a modification of the desodiation and sodiation mechanism of the as-prepared Na 3 V 2 (PO 4 ) 2 FO 2 compared to those synthesized by conventional solid-state approaches. Furthermore, the electrochemical performance of Na 3 V 2 (PO 4 ) 2 FO 2 obtained at different cycling rates is also discussed.
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