Insights into the Jahn-Teller effect in layered oxide cathode materials for potassium-ion batteries

Yunshan Zheng, Huixian Xie, Junfeng Li, Kwan San Hui, Zhenjiang Yu, Huifang Xu, Duc Anh Dinh, Zhenqing Ye, Chenyang Zha, Kwun Nam Hui

Research output: Contribution to journalReview articlepeer-review

Abstract

Potassium-ion batteries (PIBs) have attracted increasing interest as promising alternatives to lithium-ion batteries (LIBs) in large-scale electrical energy storage systems due to the potential price advantages, abundant availability of potassium resources, and low standard redox potential of potassium. However, the pursuit of suitable cathode materials that exhibit desirable characteristics such as voltage platforms, high capacity, and long cycling stability is of utmost importance. Recently, layered transition-metal oxides for PIBs offer great potential due to their high theoretical capacity, suitable voltage range, and eco-friendliness. Nevertheless, the progress of KxMO2 cathodes in PIBs faces obstacles due to the detrimental effects of structural disorder and irreversible phase transitions caused by the Jahn-Teller effect. This review provides a brief description of the origin and mechanism of the Jahn-Teller effect, accompanied by the proposed principles to mitigate this phenomenon. In particular, the current status of KxMO2 cathodes for PIBs, is summarized highlighting the challenges posed by the Jahn-Teller effect. Furthermore, promising strategies, such as composition modulation, synthesis approaches, and surface modification, are proposed to alleviate and suppress the Jahn-Teller effect. These strategies offer valuable insights into the prospects of innovative cathode materials and provide a foundation for future research in the field of PIBs.

Original languageEnglish
Article number2400461
JournalAdvanced Energy Materials
Volume14
Issue number14
Early online date23 Feb 2024
DOIs
Publication statusPublished - 12 Apr 2024

Keywords

  • cathode materials
  • Jahn–Teller effect
  • layered oxide
  • potassium-ion battery
  • strategies

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