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Oxygen Redox Activity through a Reductive Coupling Mechanism in the P3-Type Nickel-Doped Sodium Manganese Oxide
Univ St Andrews, Sch Chem, St Andrews KY16 9ST, Fife, Scotland;ALISTORE ERI, F-80039 Amiens, France.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.ORCID iD: 0000-0001-8471-0955
Univ Kent, Sch Phys Sci, Canterbury CT2 7NH, Kent, England.
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2020 (English)In: ACS APPLIED ENERGY MATERIALS, ISSN 2574-0962, Vol. 3, no 1, p. 184-191Article in journal (Refereed) Published
Abstract [en]

Increasing dependence on rechargeable batteries for energy storage calls for the improvement of energy density of batteries. Toward this goal, introduction of positive electrode materials with high voltage and/or high capacity is in high demand. The use of oxygen chemistry in lithium and sodium layered oxides has been of interest to achieve high capacity. Nevertheless, a complete understanding of oxygen-based redox processes remains elusive especially in sodium ion batteries. Herein, a novel P3-type Na0.67Ni0.2Mn0.8O2, synthesized at low temperature, exhibits oxygen redox activity in high potentials. Characterization using a range of spectroscopic techniques reveals the anionic redox activity is stabilized by the reduction of Ni, because of the strong Ni 3d-O 2p hybridization states created during charge. This observation suggests that different route of oxygen redox processes occur in P3 structure materials, which can lead to the exploration of oxygen redox chemistry for further development in rechargeable batteries.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2020. Vol. 3, no 1, p. 184-191
Keywords [en]
sodium ion batteries, layered oxides, anion redox, P3 structure, reductive coupling mechanism, resonant inelastic X-ray scattering
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-407185DOI: 10.1021/acsaem.9b02171ISI: 000510104700024OAI: oai:DiVA.org:uu-407185DiVA, id: diva2:1416068
Available from: 2020-03-20 Created: 2020-03-20 Last updated: 2020-03-20Bibliographically approved

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Ma, Le AnhDuda, LaurentYounesi, Reza

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