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Cryptomelane K1.33Mn8O16 as a cathode for rechargeable aqueous zinc-ion batteries

Sada, K and Senthilkumar, B and Barpanda, P (2019) Cryptomelane K1.33Mn8O16 as a cathode for rechargeable aqueous zinc-ion batteries. In: Journal of Materials Chemistry A, 7 (41). pp. 23981-23988.

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Official URL: https://doi.org/10.1039/c9ta05836b


Aqueous rechargeable zinc-ion batteries have immense commercial potential in the primary battery market, which is largely occupied by alkaline zinc/manganese oxide batteries. These storage systems are desirable for large-scale applications due to their superior safety, high capacity, fast ionic conductivity and low cost. Pursuing new Mn-based cathodes for Zn-ion batteries, cryptomelane with a specific chemical composition of K1.33Mn8O16 was synthesized using a simple sonochemical technique. The formation of phase pure tetragonal K1.33Mn8O16 with I4/m symmetry was confirmed by X-ray diffraction. When tested as a cathode for Zn-ion batteries, cryptomelane K1.33Mn8O16 demonstrated a high reversible capacity of 312 mA h g-1 at a rate of C/10. Robust cycling stability was observed retaining more than 80% of initial capacity after 650 cycles with ∼99% coulombic efficiency. The intercalation chemistry of Zn-MnO2 systems is very rich involving polymorphism and phase transformations during charge/discharge cycles. Synergizing ex situ X-ray diffraction and spectroscopy with the electrochemical titration technique, we have examined the detailed mechanism of (de)intercalation of Zn2+ into cryptomelane K1.33Mn8O16, which is proposed as a potential cathode for Zn-ion batteries.

Item Type: Journal Article
Publication: Journal of Materials Chemistry A
Publisher: Royal Society of Chemistry
Additional Information: The copyright for this article belongs to the Royal Society of Chemistry.
Keywords: Alkalinity; Cathodes; Chromium compounds; Intercalation; Iodine compounds; Ions; Manganese oxide; Secondary batteries; X ray diffraction, Charge/discharge cycle; Chemical compositions; Commercial potential; Coulombic efficiency; High reversible capacities; Intercalation chemistry; Large-scale applications; Sonochemical techniques, Potassium compounds
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 06 Dec 2022 05:58
Last Modified: 06 Dec 2022 05:58
URI: https://eprints.iisc.ac.in/id/eprint/78263

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