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Achieving a high-performance sodium-ion pouch cell by regulating intergrowth structures in a layered oxide cathode with anionic redox

Title data

Wang, Xiaotong ; Zhang, Qinghua ; Zhao, Chen ; Li, Haifeng ; Zhang, Baodan ; Zeng, Guifan ; Tang, Yonglin ; Huang, Zhongyuan ; Hwang, Inhui ; Zhang, Haitang ; Zhou, Shiyuan ; Qiu, Yongfu ; Xiao, Yinguo ; Cabana, Jordi ; Sun, Cheng-Jun ; Amine, Khalil ; Sun, Yang ; Wang, Qingsong ; Xu, Gui-Liang ; Gu, Lin ; Qiao, Yu ; Sun, Shi-Gang:
Achieving a high-performance sodium-ion pouch cell by regulating intergrowth structures in a layered oxide cathode with anionic redox.
In: Nature Energy. Vol. 9 (2024) Issue 2 . - pp. 184-196.
ISSN 2058-7546
DOI: https://doi.org/10.1038/s41560-023-01425-2

Official URL: Volltext

Abstract in another language

In P2-type layered transition metal (TM) oxides, which are typical cathode materials for Na-ion batteries, the presence of Li within the TM layer could lead to the formation of specific Na–O–Li configurations that trigger additional oxygen redox at high charging voltages. However, the prismatic-type (P-type) to octahedral-type (O-type) phase transition and irreversible TM migration could be simultaneously aggravated in high state of charge, resulting in structural distortion. Here we demonstrate that excessive desodiation of P2-Na0.67Li0.1Fe0.37Mn0.53O2 (NLFMO) induces the formation of neighbouring O-type stacking faults with an intergrowth structure (that is, interlacing of O- and P-type layers), which leads to out-of-lattice Li migration and irreversible oxygen loss. We show that, by controlling the depth of charge to tailor the intergrowth structure, a P-type stacking state can be uniformly interspersed between the O-type stacking state, thereby avoiding neighbouring O-type stacking faults. Adjusting the O/P intergrowth structure leads to both reversible migration of Li/TM ions and reversible anionic redox in the NLFMO cathode. We thereby achieve a high-performance pouch cell (with an energy density of 165 W h kg−1 based on the entire weight of the cell) with both cationic and anionic redox activities.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Lehrstuhl Anorganische Aktivmaterialien für elektrochemische Energiespeicher
Research Institutions > Central research institutes > Bayerisches Zentrum für Batterietechnik - BayBatt
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 500 Natural sciences
500 Science > 540 Chemistry
Date Deposited: 18 Jun 2024 08:37
Last Modified: 18 Jun 2024 08:37
URI: https://eref.uni-bayreuth.de/id/eprint/89780