A Conformal Protective Skin Producing Stable Cathode-Electrolyte Interface for Long-Life Potassium-Ion Batteries

Yan Huang, Xinyuan Zhang, Nan Chen, Ruiyuan Tian, Yi Zeng, Fei Du

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The development of K-based layered oxide cathodes is essential for boosting the competitiveness of potassium-ion batteries (PIBs) in grid-scale energy storage. However, their service life is dramatically limited by interfacial instability issues, which is still poorly understood. In this work, amorphous FePO4 (a-FP) is built on K0.5Ni0.1Mn0.9O2 (KNMO) as the protective skin, whose elasticity for strain relaxation and the K-conducting nature guarantee its integrity during fast and constant K-ion insertion/extraction. The conformal coating leads to a robust interphase on the cathode surface, which qualifies excellent K-transport ability and significantly suppresses the mechanical cracking and transition metal dissolution. Breakthrough in cycle life of the K-based layered cathodes is therefore achieved, which of the amorphous FePO4 coated K0.5Ni0.1Mn0.9O2 (KNMO@a-FP) reaches 2500 cycles. The insights gained from the surface protection layer construction and the in-depth analysis of its working mechanism pave the way for further development of K-based layered cathodes with both bulk structural and interfacial stability.

Original languageEnglish
Article number2302841
JournalSmall
Volume19
Issue number40
Early online date1 Jun 2023
DOIs
StatePublished - 4 Oct 2023
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2023 Wiley-VCH GmbH.

Keywords

  • K-ion batteries
  • cathode-electrolyte interface
  • conformal surface protection
  • cycling stability
  • layered cathode materials

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