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High Potassium Storage Capability of H2V3O8 in a Non-Aqueous Electrolyte

Title
High Potassium Storage Capability of H2V3O8 in a Non-Aqueous Electrolyte
Authors
Rastgoo-Deylami, MohadeseHeo, Jongwook W.Hong, Seung-Tae
DGIST Authors
Hong, Seung-Tae
Issue Date
2019-10
Citation
ChemistrySelect, 4(40), 11711-11717
Type
Article
Article Type
Article
Author Keywords
Cathode materialHydrated vanadium oxideIntercalationLayered compoundPotassium-ion battery
Keywords
SODIUM-ION BATTERIESCATHODE MATERIALSHIGH-CAPACITYK-IONVANADIUM-OXIDESENERGY-STORAGEINTERCALATIONGRAPHENELINA
ISSN
2365-6549
Abstract
Potassium-ion batteries (KIBs) are one of the potential candidates for large-scale energy storage devices with low cost due to the abundance of potassium resources. However, the development of cathode materials with high capacity and structural stability has been a challenge due to the difficulties of intercalation of the large size of K-ions into host materials. In this work, H2V3O8 (or V3O7⋅H2O) is reported as a new cathode material for KIBs. It shows reversible potassium-intercalation behavior with the first discharge capacity of 168 mAh g−1 at 5 mA g−1 and an average discharge voltage of ∼2.5 V (vs. K/K+) in 0.5 M KPF6 in EC/DEC (1:1 v/v). The specific capacity increases up to 181 mAh g−1 for the third cycle and gradually decreases with 75% of the capacity retention after 100 cycles. The chemical formula of the potassiated phase is K1.77H2V3O8. However, scan-rate dependent cyclic voltammetry and elemental analyses suggest that ∼28% of the capacity comes from the surface K ions on the H2V3O8 particles; thus, the bulk-intercalated phase can be formulated as K1.27H2V3O8. The crystal structure is stable during the electrochemical cycling, keeping the structural water, confirming that H2V3O8 can be considered as one of the high-capacity cathode materials for KIBs. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
URI
http://hdl.handle.net/20.500.11750/10954
DOI
10.1002/slct.201900618
Publisher
Wiley-VCH Verlag GmbH
Related Researcher
  • Author Hong, Seung-Tae Battery Materials Discovery Laboratory
  • Research Interests Magnesium, calcium, and zinc ion batteries; lithium all-solid-state batteries, New inorganic materials discovery; Solid state chemistry; Crystallography; Mg, Ca, Zn 이온 이차전지; 리튬 전고체전지; 신 무기재료 합성; 고체화학; 결정화학
Files:
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Collection:
Department of Energy Science and EngineeringBattery Materials Discovery Laboratory1. Journal Articles


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