TY  - JOUR
AU  - Ghoshal, Amit
AU  - Thakur, Vikas Singh
AU  - Pramanik, Susmita
AU  - Mehta, Vanshika
AU  - Meena, Sher Singh
AU  - Hirsbrunner, Moritz
AU  - Kaushik, S. D.
AU  - Dan, Tinku
AU  - Törnblom, Pontus
AU  - Duda, Laurent
AU  - Ghosh, Anirudha
AU  - Såthe, Conny
AU  - Tokushima, Takashi
AU  - Ghosh, Subham
AU  - Banerjee, Swastika
AU  - Maitra, Urmimala
TI  - Unlocking high performance in a Na–Fe–Mn–O cathode through phase-transition-free cycling
JO  - EES batteries
VL  - 1
IS  - 5
SN  - 3033-4071
CY  - Washington DC
PB  - Royal Society of Chemistry
M1  - PUBDB-2025-04562
SP  - 1255 - 1266
PY  - 2025
AB  - Fe–Mn-based Na-layered oxide cathodes suffer from severe phase transitions at high states of charge, accompanied by transition metal migration and large-volume collapse. We propose the incorporation of a small amount of Li+ into the transition metal layer to enable phase-transition-free cycling across a wide state-of-charge (SOC) range. In contrast to the previously studied undoped or Li/Mg/Ni doped P2-type Na–Fe–Mn–O cathodes, our P2-Na0.7Li0.127Fe0.127Mn0.746O2 (NLFM) cathode, which has optimized Li, Fe and Mn contents and a disordered transition-metal layer, exhibits the remarkable property of complete suppression of O-type layer formation up to the highest charge voltage of 4.5 V. The cathode demonstrates reversible high-voltage Fe and O redox reactions without any phase transition. The P to O phase transition, accompanied by transition-metal-migration and □–O–□ (□ = vacancy) formation, is essential for the activation of O-redox in undoped Fe–Mn cathodes. The highly ionic character of Li–O bonds in NLFM increases the electron density over the O orbitals, making O-redox feasible in the P2-phase even in the absence of □–O–□. By retaining its P2 phase at the highest state of charge, the cathode shows a negligible volume change of less than 1.8
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1039/D5EB00106D
UR  - https://bib-pubdb1.desy.de/record/639476
ER  -