Mitigating the Cooperative Distortion and Phase Transition of P'2 Phase to Prepare Stable Fast-Charghing Layered Cathode.

Authors

Chang Liu, Yingshuang Sun, Ziyi Zhan, Wenhao Qiu, Jiale Cao, Wenhai Ji, Ping Miao, Xinxin Teng, Wujun Peng, Jun Chen, Zijian Wang, Min Chen, Ziwei Chen, Qinghua Zhang

Published in

Small (Weinheim an der Bergstrasse, Germany). Pages e75783. Sep 29, 2026. Epub Sep 29, 2026.

Abstract

Sodium-ion batteries are promising for large-scale energy storage systems, but simultaneously achieving high capacity, super-fast charging, and long-term cycling remains challenging. Here, we report a P'2-type layered oxide cathode Na_0.67Fe_0.2Mn_0.8O₂@Oxygen-Free derived from conventional P2-type Na_0.67Fe_0.2Mn_0.8O₂ via oxygen-free re-sintering treatment, and further introduce trace Cu/Ti into the transition metal layer to obtain Na_0.67Fe_0.2Mn_0.76Cu_0.02Ti_0.02O₂. The co-doping strategy alleviates phase transition and enhances structural stability. As a result, FMOF-CT delivers a high reversible capacity of 197.76 mAh g^{- 1} at 0.2C and retains 99.35% of its initial capacity after 100 cycles at an ultra-high rate of 20C. Combined in situ characterization methods reveal that the superior kinetic performance originates from faster Na⁺ diffusion, smoother P'2-P2-OP4 phase evolution, and mitigated interlayer slip. Subsequently, neutron powder diffraction is performed to reveal the structure-activity relationship. This work demonstrates an effective structural design for achieving super-fast charging and stable cycling in layered oxide cathodes for sodium-ion batteries.

PMID:
42808751
Bibliographic data and abstract were imported from PubMed on 29 Sep 2026.

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