Role of Co Content on the Electrode Properties of P3-Type K0.5Mn1-xCoxO2 Potassium Insertion Materials

Jha, PK and Barpanda, P (2023) Role of Co Content on the Electrode Properties of P3-Type K0.5Mn1-xCoxO2 Potassium Insertion Materials. In: Inorganic Chemistry .

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Abstract

Potassium-ion batteries are widely being pursued as potential candidates for stationary (grid) storage, where energy dense K+ insertion cathodes are central to economic and energy efficient operation. To develop robust K-based cathodes, it is key to correlate their underlying electronic states to the final electrochemical performance. Here, we report the synthesis and structure-electrochemical property correlation in P3-type K0.5Mn1-xCoxO2 binary layered oxide cathodes. Spectroscopic analyses revealed a random distribution of Mn and Co in transition metal layers in the oxygen anion framework. In this solid-solution family, Co substitution improved the electronic conductivity and structural stability of P3 phases by minimizing local lattice distortion. Co substitution led to a systematic shift of the Co4+/Co3+ and Mn4+/Mn3+ redox potentials. Galvanostatic cycling showed that the Co substitution reduced the initial capacity while improving the cycling stability. The role of Co on final electrochemical properties of P3-layered oxides has been elucidated as a design tool to develop practical potassium-ion batteries. © 2024 American Chemical Society.

Item Type:	Journal Article
Publication:	Inorganic Chemistry
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society.
Keywords:	Electrochemical properties; Energy efficiency; Ions; Manganese compounds; Potassium; Redox reactions; Spectroscopic analysis; Stability, Co content; CO substitution; Cosubstitution; Electrode properties; Energy; Energy efficient operations; Grid Storage; Insertion materials; Ion batteries; Potassium ions, Cathodes, anion; oxygen; potassium; potassium ion, article; cathode electrode; conductance; controlled study; electrode; oxidation reduction potential; spectroscopy; synthesis
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	24 May 2024 11:07
Last Modified:	24 May 2024 11:07
URI:	https://eprints.iisc.ac.in/id/eprint/84973

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