High-Entropy NASICON Phosphates (Na.sub.3./sub.M.sub.2./sub.(PO.sub.4./sub.).sub.3./sub. and NaMPO.sub.4./sub.O.sub.x./sub., M = Ti, V, Mn, Cr, and Zr) for Sodium Electrochemistry

0557580 - ÚJF 2023 RIV US eng J - Journal Article
Wu, B. - Hou, G. - Kovalska, E. - Mazánek, V. - Marvan, P. - Liao, L. - Děkanovský, L. - Sedmidubský, D. - Marek, I. - Hervoches, Charles - Sofer, Z.
High-Entropy NASICON Phosphates (Na₃M₂(PO₄)₃ and NaMPO₄O_x, M = Ti, V, Mn, Cr, and Zr) for Sodium Electrochemistry.
Inorganic Chemistry. Roč. 61, č. 9 (2022), s. 4092-4101. ISSN 0020-1669. E-ISSN 1520-510X
Research Infrastructure: Reactors LVR-15 and LR-0 II - 90120; CANAM II - 90056
Institutional support: RVO:61389005
Keywords : batteries * diffractions * transition metals
OECD category: Inorganic and nuclear chemistry
Impact factor: 4.6, year: 2022
Method of publishing: Limited access
https://doi.org/10.1021/acs.inorgchem.1c03861

High-entropy materials, with complex compositions and unique cocktail characteristics, have recently drawn significant attention. Additionally, a family of sodium super ion conductors (NASICONs)-structured phosphates in energy storage areas shows a comprehensive application for traditional alkaline ion batteries and, in particular, solid-state electrolytes. However, there is no precedent in fabricating this kind of NASICON-type high-entropy phase. Here, we report the successful fabrication of two well-crystallized high-entropy phosphates, namely, Na-3(Ti0.2V0.2Mn0.2Cr0.2Zr0.2)(2)(PO4)(3) (HE-N3M2P3) and Na(Ti0.2V0.2Mn0.2Cr0.2Zr0.2)(2)PO4Ox (HE-NMP). The prepared materials in which the transition metals (TMs) of Ti, V, Mn, Cr, and Zr occupy the same 12c Wykoff position can form a structure analogous to R (3) over barc Na3V2(PO4)(3) that is carefully determined by X-ray diffraction, neutron diffraction, and transmission electron microscopy. Further, their performance for sodium ion batteries and sodium-based solid-state electrolytes was evaluated. The HE-N3M2P3 might exhibit a promising electrochemical performance for sodium storage in terms of its structure resembling that of Na3V2(PO4)(3). Meanwhile, the HE-NMP shows considerable electrochemical activity with numerous broad redox ranges during extraction and insertion of Na+, related to the coexistence of several TM elements. The evaluated temperature-dependent ionic conductivity for HE-NMP solid electrolyte varies from 10(-6) to 10(-5) S cm(-1) from room temperature to 398.15 K, offering high potential for energy storage applications as a new high-entropy system.
Permanent Link: http://hdl.handle.net/11104/0331541


Research data: Cambridge Structural Database