Lattice Engineered P2-Type Cathodes with Enhanced Phase-Transition Reversibility and Diffusion Kinetics for High-Power Na-Ion Batteries
ACS Sustainable Chemistry and Engineering, cilt.14, sa.3, ss.1275-1283, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 14 Sayı: 3
- Basım Tarihi: 2026
- Doi Numarası: 10.1021/acssuschemeng.5c09047
- Dergi Adı: ACS Sustainable Chemistry and Engineering
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Compendex
- Sayfa Sayıları: ss.1275-1283
- Anahtar Kelimeler: P2-type cathode, Ni-Mn based layered oxides, doping modification, high-power, Na-ion batteries
- Boğaziçi Üniversitesi Adresli: Hayır
Özet
P2-type Na0.67Ni0.33Mn0.67O2 has emerged as a promising cathode material for sodium-ion batteries (SIBs) owing to its high operating voltage (>3.5 V) and considerable theoretical capacity (∼173 mAh g-1). Nevertheless, its practical performance is largely hindered by sluggish Na+ kinetics, primarily originating from Na+/vacancy ordering and an irreversible P2-O2 phase transition upon deep desodiation. In this work, a dual-doping strategy is employed to develop Na0.67Mg0.05Ni0.28Mn0.57Ti0.1O2 (TiMg-P2O), in which Ti4+ substitution in the transition metal layer stabilizes the oxygen sublattice via strong Ti-O covalent bonding, effectively suppressing lattice oxygen instability and Na+/vacancy rearrangement. Meanwhile, the incorporation of Mg2+ in both the transition metal (TM) and sodium (Na) layers, with Mg in the sodium layer acting as a structural “pillar”, maintains the interlayer spacing and preserves the stability of fast Na+ diffusion pathways even in a deeply desodiated state. As a result, the TiMg-P2O cathode delivers a reversible capacity of 107 mAh g-1 at 1C and retains 97 mAh g-1 at 5C, significantly outperforming the pristine P2O cathode (76 mAh g-1 and 22 mAh g-1). This study highlights a practical and scalable codoping strategy to engineer robust P2-type layered oxides with enhanced electrochemical performance for next-generation SIBs.