P2–Na2/3Mg1/4Mn7/12Co1/6O2 cathode material based on oxygen redox activity with improved first-cycle voltage hysteresis

Tapia-Ruiz, N. and Soares, C. and Somerville, J.W. and House, R.A. and Billaud, J. and Roberts, M.R. and Bruce, P.G. (2021) P2–Na2/3Mg1/4Mn7/12Co1/6O2 cathode material based on oxygen redox activity with improved first-cycle voltage hysteresis. Journal of Power Sources, 506. ISSN 0378-7753

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Abstract

The recent report of P2–Na2/3Mg0.28Mn0.72O2 (P2-NMM) demonstrated the possibility of utilizing the oxygen redox couple in a layered oxide cathode without the need for alkali ions or vacancies in the transition metal layer. In this work, we report the synthesis of a new P2-type compound, Na2/3Mg1/4Mn7/12Co1/6O2 (P2-NMMC), which exhibits reversible specific capacities as high as 173 mAh g−1 and an improvement of the first cycle voltage hysteresis over P2-NMM. The material was characterised using a combination of ex-situ and operando techniques including X-ray diffraction (XRD), differential electrochemical mass spectrometry (DEMS) and X-ray spectroscopy (XAS) to identify potential sources for this improvement.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Power Sources
Additional Information:
This is the author’s version of a work that was accepted for publication in Journal of Power Sources. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Power Sources, 506, 2021 DOI: 10.1016/j.jpowsour.2021.230104
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2100/2105
Subjects:
ID Code:
157323
Deposited By:
Deposited On:
15 Jul 2021 14:45
Refereed?:
Yes
Published?:
Published
Last Modified:
06 Oct 2021 08:19