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Issue 5, 2018
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Manganese pyrosilicates as novel positive electrode materials for Na-ion batteries

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Abstract

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.

Graphical abstract: Manganese pyrosilicates as novel positive electrode materials for Na-ion batteries

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Publication details

The article was received on 07 Dec 2017, accepted on 13 Mar 2018 and first published on 13 Mar 2018


Article type: Communication
DOI: 10.1039/C7SE00587C
Citation: Sustainable Energy Fuels, 2018,2, 941-945
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    Manganese pyrosilicates as novel positive electrode materials for Na-ion batteries

    V. Renman, M. Valvo, C. Tai, C. P. Gómez, K. Edström and A. Liivat, Sustainable Energy Fuels, 2018, 2, 941
    DOI: 10.1039/C7SE00587C

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