In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 9, No. 34 ( 2021), p. 18272-18279
Kurzfassung:
P2-layered metal oxide cathodes exhibit great promise for use in sodium ion batteries due to their unique two-dimensional tunnel structure, high energy density and high redox potential, etc. However, the inferior structural stability and irreversible phase change of P2-layered cathodes inhibit their development. The best effective strategies to improve their structural stability and sodium storage properties are via the optimization of the P2-layered tunnel structure and morphology by adjusting the Na + contents, lithium substitution and rational element doping. Herein, the first sub-group element (Cu 2+ , Ag + and Au + ) doped Na 0.5 Li 0.07 Mn 0.61 Co 0.16 Ni 0.16 O 2 cathodes were successfully prepared and systematically studied using operando X-ray powder diffraction (XRD), Rietveld refinement with corresponding Fourier electron cloud maps and the galvanostatic intermittent titration technique (GITT). These data indicate that the lattice parameters ( a / b , c and V ), energy barrier, and Na + diffraction coefficient of sub-group element-doped Na 0.5 Li 0.07 Mn 0.61 Co 0.16 Ni 0.16 O 2 cathodes are gradually improved in line with an increase in the sub-group element radii, which facilitate the kinetics of Na + migration due to the synergistic effect between the valence and radius. Additionally, the structural stability and sodium storage mechanism of the optimized hybrid Na 0.5 Li 0.07 Mn 0.6 Co 0.16 Ni 0.16 Au 0.01 O 2 electrode was revealed via operando XRD.
Materialart:
Online-Ressource
ISSN:
2050-7488
,
2050-7496
Sprache:
Englisch
Verlag:
Royal Society of Chemistry (RSC)
Publikationsdatum:
2021
ZDB Id:
2702232-8
