X inyin Cai , Nan Wang, Xun-Lu Li, et al. Fast oxygen redox enabled by flexible Al–O bonds in P2-type layered oxides for sodium batteries. p670‒680
This research article focuses on enhancing the oxygen redox kinetics of sodium-ion battery cathodes by engineering flexible Al−O bonds in P2-type layered oxides. The cover features the fast transport of Na ions within an Al-doped P2-type layered oxide cathode, where oxygen redox chemistry is active. Green spheres denote Al atoms covalently bonded to oxygen atoms (red spheres), highlighting the critical role of Al-doping in transition metal layered structures, mitigating local structural distortions of MnO 6 octahedrons (blue octahedron) via Al−O bond shrinking and suppresses O-type stacking phase transitions. Yellow spheres represent sodium ions, reflecting their fast diffusion through the layered framework, while the “e − ” label near oxygen atoms signifies the oxygen redox process. Specifically, oxygen loses electron during charge/discharge, which contributes to the battery’s enhanced energy density.
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