JOURNAL ARTICLE

Advanced K3V2(PO4)2O2F cathode for rechargeable potassium-ion batteries with high energy density.

  • Published In: Applied Physics Letters, 2024, v. 124, n. 18. P. 1 1 of 3

  • Database: Academic Search Ultimate 2 of 3

  • Authored By: Gu, Zhen-Yi; Wang, Xiao-Tong; Zhao, Xin-Xin; Cao, Jun-Ming; Heng, Yong-Li; Zheng, Shuo-Hang; Liu, Yan; Guo, Jin-Zhi; Wang, Si-Ze; Wu, Xing-Long 3 of 3

Abstract

This article focuses on the development and characterization of K3V2(PO4)2O2F (KVPOF), a vanadium-based fluorophosphate cathode material for potassium-ion batteries (PIBs). Prepared via electrochemical ion exchange from its sodium counterpart, KVPOF demonstrates a high specific capacity of 116.3 mAh/g at 20 mA/g and an average operating voltage of about 3.5 V versus K+/K, resulting in an energy density of approximately 410 Wh/kg. In situ X-ray diffraction confirms the material's highly reversible crystal structure during potassium ion insertion and extraction, while electrochemical tests reveal good rate capability and cycling stability, including 94.8% capacity retention over 500 cycles in full cells paired with graphite anodes. These findings suggest KVPOF's potential as a cost-effective and stable cathode for advanced PIBs, addressing challenges related to large potassium ion size and structural stability in energy storage applications.

Additional Information

  • Source:Applied Physics Letters. 2024/04, Vol. 124, Issue 18, p1
  • Document Type:Article
  • Subject Area:Chemistry
  • Publication Date:2024
  • ISSN:0003-6951
  • DOI:10.1063/5.0197194
  • Accession Number:177039211
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