Strong Anionic Repulsion for Fast Na Kinetics in P2-Type Layered Oxides.

ABSTRACT: An intriguing mechanism for enabling fast Na kinetics during oxygen redox (OR) is proposed to produce high-power-density cathodes for sodium-ion batteries (SIBs) based on the P2-type oxide models, Na_2/3 [Mn_6/9 Ni_3/9 ]O₂ (NMNO) and Na_2/3 [Ti_1/9 Mn_5/9 Ni_3/9 ]O₂ (NTMNO) using the "potential pillar" effect. The critical structural parameter of NTMNO lowers the Na migration barrier in the desodiated state because the electrostatic repulsion of O(2p)O(2p) that occurs between transition metal layers is combined with the chemically stiff Ti⁴⁺ (3d)O(2p) bond to locally retain the strong repulsion effect. The NTMNO interlayer distance moderately decreases upon charging with oxygen oxidatio

SUBMITTER: Kwon D 

PROVIDER: S-EPMC10074072 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature