Crystal-Water-Free Potassium Vanadium Bronze (K0.5V2O5) as a Cathode Material for Ca-Ion Batteries

Meladia E. Purbarani, Jooeun Hyoung, Seung Tae Hong

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32 Scopus citations

Abstract

The research to discover a suitable cathode material for calcium-ion batteries (CIBs) remains challenging, despite their potential advantages of high energy density and cost-effectiveness. Herein, we report K0.5V2O5 as a cathode material for CIBs. During the initial charging of the electrode, potassium ions were replaced with 0.12 Ca. The calcium-exchanged electrode exhibited a reversible discharge capacity of â 100 mAh g-1 at 0.1 C rate at room temperature with an average voltage of â 3.0 V (vs Ca/Ca2+). The reversible capacity is higher than any reported cathode materials without crystal water, demonstrating the feasibility of further development of high-capacity crystal-water-free CIB cathode materials.

Original languageEnglish
Pages (from-to)7487-7491
Number of pages5
JournalACS Applied Energy Materials
Volume4
Issue number8
DOIs
StatePublished - 23 Aug 2021

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Keywords

  • calcium vanadium bronze
  • calcium-ion batteries
  • cathode material
  • intercalation
  • potassium vanadium bronze

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