Journal
BATTERIES-BASEL
Volume 7, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/batteries7030054
Keywords
calcium-ion battery; cathode material; kazakhstanite; post-lithium-ion battery; layered iron vanadate
Funding
- Samsung Research Funding & Incubation Center of Samsung Electronics [SRFC-MA1601-04]
- Creative Materials Discovery Program through the National Research Foundation of Korea - Ministry of Science, ICT and Future Planning [2015M3D1A1069707]
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The discovery of a high-performance calcium-ion battery cathode material, FeV3O9·1.2H2O, is significant in the development of high energy density calcium-ion batteries.
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 FeV3O9 center dot 1.2H(2)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 similar to 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.
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