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Pseudocapacitive charge storage properties of Na2/3Co2/3Mn2/9Ni1/9O2 in Na-ion batteries
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
Univ Cadi Ayyad, FST Marrakech, LCME, Av A Khattabi,BP 549, Marrakech 40000, Morocco.
Univ Cadi Ayyad, FST Marrakech, LCME, Av A Khattabi,BP 549, Marrakech 40000, Morocco;Mohamed VI Polytech Univ, Mat Sci & Nanoengn Dept, Lot 660 Hay Moulay Rachid, Benguerir 43150, Morocco.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.ORCID iD: 0000-0003-4440-2952
2018 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 276, p. 142-152Article in journal (Refereed) Published
Abstract [en]

The behaviour of Na2/3Co2/3Mn2/9Ni1/9O2 in composite electrodes is studied via Na half-cells utilizing a dedicated cyclic voltammetry approach. The application of increasing sweep rates enabled a detailed analysis of the red-ox peaks of this material. All peak currents due to cathodic/anodic processes demonstrated clear capacitive properties. This finding widens the picture of classical Na+ insertion/ extraction in this complex oxide, as purely diffusive processes of Na+ through its layers do not fully explain the pseudocapacitance displayed by its red-ox peaks, which are typically linked to concomitant oxidation state changes for its transition metal atoms and/or phase transitions. No phase transition was observed during in operando X-Ray diffraction upon charge to 4.2 V vs. Na+/Na, proving good structural stability for P2-NaxCo2/3Mn2/9Ni1/9O2 upon Na+ removal. The origin of such pseudocapacitive properties is likely nested in strong electrostatic interactions among the metal oxide slabs and a tendency to release Na+ from its crystallites, e.g. to form surface by-products upon air exposure. Such a reactivity induces defects (e.g. vacancies) in its lattice and charge compensation mechanisms are required to maintain an overall charge neutrality, thus ultimately influencing the electrochemical properties. Possible limiting factors for the performances of this compound in composite coatings are also discussed.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2018. Vol. 276, p. 142-152
Keywords [en]
Na-ion batteries, Na2/3Co2/3Mn2/9Ni1/9O2, Layered oxides, Positive electrodes, Pseudocapacitance
National Category
Materials Chemistry Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-356610DOI: 10.1016/j.electacta.2018.04.150ISI: 000433042500016OAI: oai:DiVA.org:uu-356610DiVA, id: diva2:1236656
Funder
Swedish Research Council Formas, 245-2014-668Available from: 2018-08-03 Created: 2018-08-03 Last updated: 2018-08-03Bibliographically approved

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