4.7 Article

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

Journal

ACS APPLIED ENERGY MATERIALS
Volume 4, Issue 8, Pages 7487-7491

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c01158

Keywords

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

Funding

  1. Samsung Research Funding & Incubation Center of Samsung Electronics [SRFC-MA1601-04]
  2. Creative Materials Discovery Program through the National Research Foundation of Korea - Ministry of Science, ICT and Future Planning [2015M3D1A1069707]

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The research presents K0.5V2O5 as a cathode material for CIBs, showing a high reversible discharge capacity at room temperature. The findings demonstrate the potential for developing high-capacity crystal-water-free cathode materials for CIBs.
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 similar to 100 mAh g(-1) at 0.1 C rate at room temperature with an average voltage of similar to 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.

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