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Structural and electrochemical studies of novel Na7V3Al(P2O7)(4)(PO4) and Na7V2Al2(P2O7)(4)(PO4) high-voltage cathode materials for Na-ion batteries

Abstract : A series of Na7V4-x3+Alx(P2O7)(4)(PO4) (x = 0, 1, 2, and 4) materials were synthesized by flux crystal growth. Novel Na7V4-xAlx(P2O7)(4)(PO4) (x = 1 and 2) compositions were structurally characterized by single crystal and powder X-ray diffraction analyses using laboratory and high-resolution synchrotron X-ray sources. The investigation of the electrochemical behavior of two new mixed V/Al phases as positive electrodes in Na-based batteries was performed using charge-discharge galvanostatic tests and operando X-ray diffraction experiments. It is demonstrated that the substitution of a part of vanadium with aluminum in Na7V4(P2O7)(4)(PO4) significantly increases the gravimetric capacity of these materials: from 70.9 mA h g(-1) to 113.1 mA h g(-1) and from 48.1 mA h g(-1) to 92.7 mA h g(-1) in Na7V3Al(P2O7)(4)(PO4) and Na(7)V(2)A(2)l(P2O7)(4)(PO4), respectively thanks to the activation of the V4+/V5+ redox couple. Different degrees of reversibility of the electrochemical reactions operating on the V3+/V4+ and V4+/V5+ redox couples in Na7V3Al(P2O7)(4)(PO4) are discussed from the analysis of operando X-ray diffraction.
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https://hal-u-picardie.archives-ouvertes.fr/hal-03611099
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Soumis le : mercredi 16 mars 2022 - 18:57:23
Dernière modification le : mercredi 27 avril 2022 - 03:57:51

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Vadim M. Kovrugin, Jean-Noel Chotard, Francois Fauth, Arash Jamali, Renald David, et al.. Structural and electrochemical studies of novel Na7V3Al(P2O7)(4)(PO4) and Na7V2Al2(P2O7)(4)(PO4) high-voltage cathode materials for Na-ion batteries. Journal of Materials Chemistry A, 2017, 5 (27), pp.14365-14376. ⟨10.1039/c7ta03687f⟩. ⟨hal-03611099⟩

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