A 3.2Â V Binary Layered Oxide Cathode for Potassium-Ion Batteries

Jha, PK and Parate, SK and Sada, K and Yoshii, K and Masese, T and Nukala, P and Sai Gautam, G and Pralong, V and Fichtner, M and Barpanda, P (2024) A 3.2Â V Binary Layered Oxide Cathode for Potassium-Ion Batteries. In: Small .

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Abstract

Potassium-ion batteries (KIBs) can offer high energy density, cyclability, and operational safety while being economical due to the natural abundance of potassium. Utilizing graphite as an anode, suitable cathodes can realize full cells. Searching for potential cathodes, this work introduces P3-type K0.5Ni1/3Mn2/3O2 layered oxide as a potential candidate synthesized by a simple solid-state method. The material works as a 3.2 V cathode combining Ni redox at high voltage and Mn redox at low voltage and exhibits highly reversible K+ ion (de)insertion at ambient and elevated (40�50 °C) temperatures. First-principles calculations suggest the ground state in-plane Mn�Ni ordering in the MO2 sheets is strongly correlated to the K-content in the framework, leading to an interwoven and alternative row ordering of Ni�Mn in K0.5Ni1/3Mn2/3O2. Postmortem and electrochemical titration reveal the occurrence of a solid solution mechanism during K+ (de)insertion. The findings suggest that the Ni addition can effectively tune the electronic and structural properties of the cathode, leading to improved electrochemical performance. This work provides new insights in the quest to develop potential low-cost Co-free KIB cathodes for practical applications in stationary energy storage. © 2024 Wiley-VCH GmbH.

Item Type:	Journal Article
Publication:	Small
Publisher:	John Wiley and Sons Inc
Additional Information:	The copyright for this article belongs to John Wiley and Sons Inc
Keywords:	Electric batteries; Energy storage; Ground state; Ions; Nickel; Potassium, Cyclability; De-insertion; Higher energy density; Ion batteries; Layered oxide cathodes; Layered oxides; Operational safety; P3-type layered oxide; Potassium ions; Potassium-ion battery, Cathodes
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	29 Jul 2024 09:08
Last Modified:	29 Jul 2024 09:08
URI:	http://eprints.iisc.ac.in/id/eprint/85207

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