Electrochemical Study of Polymorphic MnO2 in Rechargeable Aqueous Zinc Batteries

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Abstract

Manganese dioxide is regarded as a promising energy functional material due to its open tunnel structure with enormous applications in energy storage and catalysis. In this paper, α-MnO2 with a 2 × 2 tunnel structure and β-MnO2 with a 1 × 1 tunnel structure were hydrothermally synthesized, which possess characteristic tunnel structures formed by the interconnected unit structure of [MnO6] octahedrons. With regards to their different tunnel dimensions, the specific mechanism of ion intercalation in these two phases and the effect on their performance as aqueous Zn-MnO2 battery cathodes are explored and compared. Comprehensive analyses illustrate that both α-MnO2 and β-MnO2 provide decent capacity in the aqueous battery system, but their intrinsic stability is poor due to the structural instability upon cycling. At the same time, experiments show that α-MnO2 has a better rate performance than β-MnO2 under larger currents, thus implying that the former has a broader application in this aqueous battery system.

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You, K., Yuan, Y., Liao, X., Song, W., He, X., Jin, H., & Wang, S. (2022). Electrochemical Study of Polymorphic MnO2 in Rechargeable Aqueous Zinc Batteries. Crystals, 12(11). https://doi.org/10.3390/cryst12111600

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