Stabilization of Multicationic Redox Chemistry in Polyanionic Cathode by Increasing Entropy
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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Detail(s)
Original language | English |
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Article number | 2202082 |
Journal / Publication | Advanced Science |
Volume | 9 |
Issue number | 25 |
Online published | 1 Jul 2022 |
Publication status | Published - 5 Sept 2022 |
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DOI | DOI |
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Link to Scopus | https://www.scopus.com/record/display.uri?eid=2-s2.0-85133158860&origin=recordpage |
Permanent Link | https://scholars.cityu.edu.hk/en/publications/publication(e0cfebba-0ee9-4761-9ced-ab88e2e70df6).html |
Abstract
Polyanionic compounds have large compositional flexibility, which creates a growing interest in exploring the property limits of electrode materials of rechargeable batteries. The realization of multisodium storage in the polyanionic electrodes can significantly improve capacity of the materials, but it often causes irreversible capacity loss and crystal phase evolution, especially under high-voltage operation, which remain important challenges for their application. Herein, it is shown that the multisodium storage in the polyanionic cathode can be enhanced and stabilized by increasing the entropy of the polyanionic host structure. The obtained polyanionic Na3.4Fe0.4Mn0.4V0.4Cr0.4Ti0.4(PO4)3 cathode exhibits multicationic redox property to achieve high capacity with good reversibility under the high voltage of 4.5 V (vs Na/Na+). Exploring the underlying mechanism through operando characterizations, a stable trigonal phase with reduced volume change during the multisodium storage process is disclosed. Besides, the enhanced performance of the HE material also derives from the synergistic effect of the diverse TM species with suitable molarity. These results reveal the effectiveness of high-entropy concept in expediting high-performance polyanionic cathodes discovery.
Research Area(s)
- cathode materials, high entropy, multiple redox reactions, polyanionic materials, sodium-ion batteries
Citation Format(s)
Stabilization of Multicationic Redox Chemistry in Polyanionic Cathode by Increasing Entropy. / Li, Huangxu; Xu, Ming; Long, Huiwu et al.
In: Advanced Science, Vol. 9, No. 25, 2202082, 05.09.2022.
In: Advanced Science, Vol. 9, No. 25, 2202082, 05.09.2022.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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