Influence of Interlayer Cation Ordering on Na Transport in P2-type Na0.67-xLiy Ni0.33-zMn0.67+zO2 for Sodium-Ion Batteries
October 21, 2024
(Top) Intralayer and interlayer ordering in P2-type Na0.67-xLiy Ni0.33-zMn0.67+zO2. (Bottom) Na+ diffusion pathways in the ABCABC and ABAB interlayer transition metal orderings. The darker color of the blue isosurfaces represents a higher density of Na.
Scientific Achievement
Cation interlayer ordering was shown to be tuned through the control of composition, which has an equal or greater impact on Na+ diffusion than the Na+ /vacancy ordering in P2-type layered transition metal oxides.
Significance and Impact
Synthesis methods for controlling interlayer cation ordering in layered oxides can be a valuable direction for developing high-power electrode materials.
Research Details
- Neutron/X-ray diffraction and density functional theory calculations show that Li doping (Na2/3Li0.05 Ni1/3Mn2/3O2, LFN5) promotes ABC-type interplanar Ni/Mn ordering without disrupting the Na+/vacancy ordering and creates low-energy Li-Mn coordinated diffusion pathways.
- Quasielastic neutron scattering reveals that the Na+ diffusivity in LFN5 is enhanced by an order of magnitude over Na2/3Ni1/3Mn2/3O2, increasing its capacity at high current.
“Influence of Interlayer Cation Ordering on Na Transport in P2-Type Na0.67–xLiy Ni0.33–zMn0.67+zO2 for Sodium-Ion Batteries,” Journal of the American Chemical Society, 146(22):15108–15118. (2024)
https://doi.org/10.1021/jacs.4c00869
