Regulation Engineering of Alkali Metal Interlayer Pillar in P2-Type Cathode for Ultra-High Rate and Long-Term Cycling Sodium-Ion Batteries.

ABSTRACT: Layered oxides have attracted significant attention as cathodes for sodium-ion batteries (SIBs) due to their compositional versatility and tuneable electrochemical performance. However, these materials still face challenges such as structural phase transitions, Na⁺/vacancy ordering, and Jahn-Teller distortion effect, resulting in severe capacity decay and sluggish ion kinetics. We develop a novel Cu/Y dual-doping strategy that leads to the formation of "Na-Y" interlayer aggregates, which act as structural pillars within alkali metal layers, enhancing structural stability and disrupting the ordered arrangement of Na⁺/vacancies. This disruption leads to a unique coexistence of ordered and disordered Na⁺/vacancy states with near-zero strain, which significantl

SUBMITTER: Wang X 

PROVIDER: S-EPMC12779844 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature