Layered iron vanadate as a high-capacity cathode material for nonaqueous calcium-ion batteries

Munseok S. Chae, Dedy Setiawan, Hyojeong J. Kim, Seung Tae Hong

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Calcium-ion batteries represent a promising alternative to the current lithium-ion batteries. Nevertheless, calcium-ion intercalating materials in nonaqueous electrolytes are scarce, probably due to the difficulties in finding suitable host materials. Considering that research into calcium-ion batteries is in its infancy, discovering and characterizing new host materials would be critical to further development. Here, we demonstrate FeV3 O9·1.2H2 O as a high-performance calcium-ion battery cathode material that delivers a reversible discharge capacity of 303 mAh g−1 with a good cycling stability and an average discharge voltage of ~2.6 V (vs. Ca/Ca2+ ). The material was synthesized via a facile co-precipitation method. Its reversible capacity is the highest among calcium-ion battery materials, and it is the first example of a material with a capacity much larger than that of conventional lithium-ion battery cathode materials. Bulk intercalation of calcium into the host lattice contributed predominantly to the total capacity at a lower rate, but became comparable to that due to surface adsorption at a higher rate. This stimulating discovery will lead to the development of new strategies for obtaining high energy density calcium-ion batteries.

Original languageEnglish
Article number54
JournalBatteries
Volume7
Issue number3
DOIs
StatePublished - Sep 2021
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

  • Calcium-ion battery
  • Cathode material
  • Kazakhstanite
  • Layered iron vanadate
  • Post-lithium-ion battery

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