Unblocking Oxygen Charge Compensation for Stabilized High-Voltage Structure in P2-Type Sodium-Ion Cathode

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • He Zhu
  • Zhenpeng Yao
  • Jian Zhang
  • Cheng Chao Li
  • Kamila M. Wiaderek
  • Cheng-Jun Sun
  • Hua Zhou
  • Longlong Fan
  • Yanan Chen
  • Hui Xia
  • Lin Gu
  • Si Lan

Detail(s)

Original languageEnglish
Article number2200498
Journal / PublicationAdvanced Science
Volume9
Issue number16
Online published28 Mar 2022
Publication statusPublished - 3 Jun 2022

Link(s)

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.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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