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

DOI: 10.1016/j.jpowsour.2021.230104 DOI Help

Authors: Nuria Tapia-Ruiz (University of Oxford; Lancaster University; The Faraday Institution) , Cindy Soares (Lancaster University) , James W. Somerville (University of Oxford) , Robert A. House (University of Oxford; The Faraday Institution) , Juliette Billaud (Paul Scherrer Institut (PSI)) , Matthew R. Roberts (University of Oxford) , Peter G. Bruce (University of Oxford; The Faraday Institution)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Power Sources , VOL 506

State: Published (Approved)
Published: September 2021

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.

Diamond Keywords: Batteries; Sodium-ion

Subject Areas: Materials, Chemistry

Instruments: B18-Core EXAFS

Discipline Tags:

Energy Storage Energy Physical Chemistry Energy Materials Chemistry Material Sciences

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) X-ray Absorption Near Edge Structure (XANES)