K3V2(PO4)2F3as a robust cathode for potassium-ion batteries

Xiuyi Lin, Jiaqiang Huang, Hong Tan, Jianqiu Huang, Biao Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

146 Citations (Scopus)


Potassium-ion batteries have emerged as promising candidates for low-cost and sustainable energy storage systems. The development of potassium-ion batteries is relatively slow due to the large size of potassium ions, rendering great difficulty in designing appropriate host materials. Herein, a K 3V 2(PO 4) 2F 3 cathode is inherited from Na 3V 2(PO 4) 2F 3 analog. The crystallographic structure and phase transformations are unveiled through in-situ X-ray diffraction, which shows only minor volume change of 6.2% during potassium ions insertion/extraction. Nearly two potassium ions could be provided by the electrode, delivering a capacity of over 100 mA h g −1 with a high average potential of ~3.7 V vs. K +/K. An energy density of around 400 W h kg −1 together with a respectable rate capability have been obtained. Coupling with a graphite anode, a 3.4 V-Class battery has been demonstrated, making potassium-ion batteries promising contenders to sodium ion batteries in large-scale energy storage. This discovery also sheds insights into the quest for potential electrodes from the analogs in Li/Na-ion batteries.

Original languageEnglish
Pages (from-to)97-101
Number of pages5
JournalEnergy Storage Materials
Publication statusPublished - 1 Jan 2019


  • Cathodes
  • Full cells
  • In-situ X-ray diffraction
  • Potassium-ion batteries

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science
  • Energy Engineering and Power Technology


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