Unblocking Oxygen Charge Compensation for Stabilized High-Voltage Structure in P2-Type Sodium-Ion Cathode
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 | 2200498 |
Journal / Publication | Advanced Science |
Volume | 9 |
Issue number | 16 |
Online published | 28 Mar 2022 |
Publication status | Published - 3 Jun 2022 |
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DOI | DOI |
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Link to Scopus | https://www.scopus.com/record/display.uri?eid=2-s2.0-85127299706&origin=recordpage |
Permanent Link | https://scholars.cityu.edu.hk/en/publications/publication(4c7f02f3-74f7-4100-aa9a-dd372e0d8f0b).html |
Abstract
Layered transition-metal (TM) oxides are ideal hosts for Li+ charge carriers largely due to the occurrence of oxygen charge compensation that stabilizes the layered structure at high voltage. Hence, enabling charge compensation in sodium layered oxides is a fascinating task for extending the cycle life of sodium-ion batteries. Herein a Ti/Mg co-doping strategy for a model P2-Na2/3Ni1/3Mn2/3O2 cathode material is put forward to activate charge compensation through highly hybridized O2p-TM3d covalent bonds. In this way, the interlayer O-O electrostatic repulsion is weakened upon deeply charging, which strongly affects the systematic total energy that transforms the striking P2–O2 interlayer contraction into a moderate solid-solution-type evolution. Accordingly, the cycling stability of the codoped cathode material is improved superiorly over the pristine sample. This study starts a perspective way of optimizing the sodium layered cathodes by rational structural design coupling electrochemical reactions, which can be extended to widespread battery researches.
Research Area(s)
- high-voltage structural stability, in situ synchrotron characterizations, layered transition-metal oxide cathodes, oxygen charge compensation, sodium-ion battery
Citation Format(s)
Unblocking Oxygen Charge Compensation for Stabilized High-Voltage Structure in P2-Type Sodium-Ion Cathode. / Zhu, He; Yao, Zhenpeng; Zhu, Hekang et al.
In: Advanced Science, Vol. 9, No. 16, 2200498, 03.06.2022.
In: Advanced Science, Vol. 9, No. 16, 2200498, 03.06.2022.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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