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Manganese pyrosilicates as novel positive electrode materials for Na-ion batteries
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström. (Ångström Advanced Battery Centre (ÅABC))
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström. (Ångström Advanced Battery Centre (ÅABC))
Stockholm Univ, Dept Mat & Environm Chem, Stockholm, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström. (Ångström Advanced Battery Centre (ÅABC))
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2018 (English)In: SUSTAINABLE ENERGY & FUELS, ISSN 2398-4902, Vol. 2, no 5, p. 941-945Article in journal (Refereed) Published
Abstract [en]

A carbon-coated pyrosilicate, Na2Mn2Si2O7/C, was synthesized and characterized for use as a new positive-electrode material for sodium ion batteries. The material consists of 20–80 nm primary particles embedded in a ≈10 nm-thick conductive carbon matrix. Reversible insertion of Na+ ions is clearly demonstrated with ≈25% of its theoretical capacity (165 mA h g−1) being accessible at room temperature at a low cycling rate. The material yields an average potential of 3.3 V vs. Na+/Na on charge and 2.2 V on discharge. DFT calculations predict an equilibrium potential for Na2Mn2Si2O7 in the range of 2.8–3.0 V vs. Na+/Na, with a possibility of a complete flip in the connectivity of neighboring Mn-polyhedra – from edge-sharing to disconnected and vice versa. This significant rearrangement in Mn coordination (≈2 Å) and large volume contraction (>10%) could explain our inability to fully desodiate the material, and illustrates well the need for a new electrode design strategy beyond the conventional “down-sizing/coating” procedure.

Place, publisher, year, edition, pages
2018. Vol. 2, no 5, p. 941-945
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Inorganic Chemistry Materials Chemistry
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URN: urn:nbn:se:uu:diva-356076DOI: 10.1039/c7se00587cISI: 000431422700003OAI: oai:DiVA.org:uu-356076DiVA, id: diva2:1232947
Funder
Swedish Research Council, 2011-6512Swedish Research Council, 2010-4824Swedish Research Council Formas, 245-2014-668Knut and Alice Wallenberg FoundationStandUpAvailable from: 2018-07-13 Created: 2018-07-13 Last updated: 2018-07-13Bibliographically approved

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Renman, ViktorValvo, MarioGómez, Cesar PayEdström, KristinaLiivat, Anti
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