Barruna, Elang Gong, Sang Hyuk Yoo, Yiseul Kwon, Eunji Chung, Kyung Yoon Chun, Dong Won Lee, Kyu Hyoung Yu, Seungho Kim, Hyung-Seok 2026-02-26T05:00:09Z 2026-02-26T05:00:09Z 2026-02-26 2026-04 2211-2855 https://pubs.kist.re.kr/handle/201004/154369 Utilizing oxygen redox in layered oxide cathodes offers a pathway to exceed the capacity limits of conventional cationic redox sodium-ion batteries, yet its poor reversibility and oxygen loss lead to severe capacity fading. Here, we design a Li and F co-doped P2-type cathode, Na0.7Li0.1Mg0.15Mn0.75O1.9F0.1 (NLMMOF), to simultaneously enhance and stabilize oxygen redox activity. Li substitution promotes oxygen redox via the Na–O–Li configuration, while F substitution stabilizes the oxygen redox by strengthening the metal-anion bonding. NLMMOF exhibits a high discharge capacity of 191.96 mAh g⁻¹ at 0.05 C (1.5–4.5 V) and retains 85.1 % of its capacity over 100 cycles at 0.5 C. Multiple analyses confirm that the enhanced electrochemical performance of NLMMOF is due to suppressed P2-O2 phase transition, minimal local structural distortion, and negligible oxygen evolution. DFT calculations further reveal that F substitution raises the Mn migration barrier at deep charge, mitigating Mn in-plane migration and under a coordinated oxygen lattice. This synergistic Li/F co-doping strategy provides a practical design principle for stabilizing oxygen redox in layered oxide cathodes, advancing the development of high-energy, long-life sodium-ion batteries. English Elsevier BV Synergistic enhancement of oxygen redox activity and structural integrity through Li/F doping in layered oxide cathodes for sodium-ion batteries Article 10.1016/j.nanoen.2026.111787 1 Nano Energy, v.150 Nano Energy 150 N scie scopus 001689690100001 2-s2.0-105029572030 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Chemistry Science & Technology - Other Topics Materials Science Physics Article ANIONIC REDOX HIGH-CAPACITY SUBSTITUTION Layered oxide cathodes Sodium-ion batteries Oxygen redox Phase transition Oxygen evolution