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Guest water hinders sodium-ion diffusion in low-defect Berlin green cathode material
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.ORCID iD: 0000-0001-9304-8975
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics. Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics. Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
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2022 (English)In: Dalton Transactions, ISSN 1477-9226, E-ISSN 1477-9234, Vol. 51, no 38, p. 14712-14720Article in journal (Refereed) Published
Abstract [en]

Among Prussian blue analogues (PBAs), NaxFe[Fe(CN)(6)](1-y)center dot nH(2)O is a highly attractive cathode material for sodium-ion batteries due to its high theoretical capacity of similar to 170 mA h g(-1) and inexpensive raw materials. However, concerns remain over its long-term electrochemical performance and structural factors which impact sources of resistance in the material and subsequently rate performance. Refined control of the [Fe(CN)(6)] vacancies and water content could help in realizing its market potential. In this context, we have studied a low-defect Berlin green (BG) Na0.30(5)Fe[Fe(CN)(6)](0.94(2))center dot nH(2)O with varied water content corresponding to 10, 8, 6, and 2 wt%. The impact of water on the electrochemical properties of BG was systematically investigated. The electrodes were cycled within a narrow voltage window of 3.15-3.8 V vs. Na/Na+ to avoid undesired phase transitions and side reactions while preserving the cubic structure. We demonstrate that thermal dehydration leads to a significantly improved cycling stability of over 300 cycles at 15 mA g(-1) with coulombic efficiency of >99.9%. In particular, the electrode with the lowest water content exhibited the fastest Na+-ion insertion/extraction as evidenced by the larger CV peak currents during successive scans compared to hydrated samples. The results provide fundamental insight for designing PBAs as electrode materials with enhanced electrochemical performance in energy storage applications.

Place, publisher, year, edition, pages
Royal Society of Chemistry (RSC) , 2022. Vol. 51, no 38, p. 14712-14720
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Inorganic Chemistry Materials Chemistry
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URN: urn:nbn:se:uu:diva-490828DOI: 10.1039/d2dt02384aISI: 000853592800001PubMedID: 36102869OAI: oai:DiVA.org:uu-490828DiVA, id: diva2:1719368
Funder
Swedish Energy Agency, 45517-1Available from: 2022-12-15 Created: 2022-12-15 Last updated: 2022-12-15Bibliographically approved

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Ojwang, Dickson O.Häggström, LennartEricsson, ToreMogensen, RonnieBrant, William

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Ojwang, Dickson O.Häggström, LennartEricsson, ToreMogensen, RonnieBrant, William
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Structural ChemistryMaterials PhysicsDepartment of Chemistry - Ångström
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