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On the use of guanidine hydrochloride soft template in the synthesis of Na2/3Ni1/3Mn2/3O2 cathodes for sodium-ion batteries

Aragón, M.J. ; Ortiz, G.F. ; Lavela, P. ; Tirado, J.L. ; Oliveira, J.D.C. ; Motta, F.V. ; Bomio, M.R.D.

Journal of alloys and compounds, 2019-06, Vol.789, p.1035-1045 [Periódico revisado por pares]

Lausanne: Elsevier B.V

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  • Título:
    On the use of guanidine hydrochloride soft template in the synthesis of Na2/3Ni1/3Mn2/3O2 cathodes for sodium-ion batteries
  • Autor: Aragón, M.J. ; Ortiz, G.F. ; Lavela, P. ; Tirado, J.L. ; Oliveira, J.D.C. ; Motta, F.V. ; Bomio, M.R.D.
  • Assuntos: Cathode ; Crystallites ; Diffraction patterns ; Electrodes ; Electrolytes ; Electrolytic cells ; Guanidine hydrochloride ; Layered oxides ; Morphology ; Phase transitions ; Rechargeable batteries ; Sodium-ion batteries ; X-ray diffraction
  • É parte de: Journal of alloys and compounds, 2019-06, Vol.789, p.1035-1045
  • Descrição: Several P2-Na2/3Ni1/3Mn2/3O2 layered oxides have been prepared by a modified synthesis procedure using guanidine hydrochloride as a soft template. X-ray diffraction patterns will reveal a decrease of both crystallite size and strain for guanidine hydrochloride treated samples, favoring sodium accessibility at the electrode/electrolyte interface. Also, guanidine hydrochloride promotes anisotropic particles for intermediate amounts. This specific morphology may contribute to a partial suppression of the P2-O2 phase transition. Galvanostatic tests at different rates and potential windows will evidence better capacity retention and low charge-discharge hysteresis for NaNMO-2% in close relationship with the low internal resistance values at the electrode-electrolyte interphase and apparent diffusion coefficients determined by impedance spectroscopy. A performing full sodium-ion cell will demonstrate the reliability of this material as an electrode for Na-ion cells. [Display omitted] •P2-Na2/3Ni1/3Mn2/3O2 was prepared using guanidine hydrochloride as a soft template.•Samples with intermediate guanidine content feature better capacity retention.•Their kinetic improvement is due to low impedances and high diffusion coefficient.•A full cell delivered an energy density of 210 W h kg−1 after discharging at C/20.
  • Editor: Lausanne: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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