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: a tridimensional Na-Ion insertion material with a redox active oxygen network
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| Abstract |
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| The revival of the Na-ion battery concept has prompted an intense search for new high capacity Na-based positive electrodes. Recently, emphasis has been placed on manipulating Na-based layered compounds to trigger the participation of the anionic network. We further explored this direction and show the feasibility of achieving anionic-redox activity in three-dimensional Nabased compounds. A new 3D beta-Na1.7IrO3 phase was synthesized in a two-step process, which involves first the electrochemical removal of Li from beta-Li2IrO3 to produce beta-IrO3, which is subsequently reduced by electrochemical Na insertion. We show that beta-Na1.7IrO3 can reversibly uptake nearly 1.3 Na+ per formula unit through an uneven voltage profile characterized by the presence of four plateaus related to structural transitions. Surprisingly, the beta-Na1.7IrO3 phase was found to be stable up to 600 degrees C, while it could not be directly synthesized via conventional synthetic methods. Although these Na-based iridate phases are of limited practical interest, they help to understand how introducing highly polarizable guest ions (Na+) into host rocksalt-derived oxide structures affects the anionic redox mechanism. |
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English
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| Source (journal) |
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Chemistry of materials / American Chemical Society. - Washington, D.C., 1989, currens |
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Washington, D.C. : 2018
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0897-4756 [print]
1520-5002 [online]
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30:10(2018), p. 3285-3293
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000433403800014
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| Full text (open access) |
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| Full text (publisher's version - intranet only) |
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