Influence of MnO2-Birnessite Microstructure on the Electrochemical Performance of Aqueous Zinc Ion Batteries



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López García, María Luisa and Álvarez Serrano, Inmaculada and Giraldo, David Agustin and Almodóvar, Paloma and Rodríguez Aguado, Elena and Rodríguez Castellón, Enrique (2022) Influence of MnO2-Birnessite Microstructure on the Electrochemical Performance of Aqueous Zinc Ion Batteries. Applied Sciences, 12 (3). p. 1176. ISSN 2076-3417

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KxMnO2 materials with birnessite-type structure are synthetized by two different methods which make it possible to obtain manganese oxides with different degrees of crystallinity. The XPS results indicate that the sample obtained at high temperature (KMn8) exhibits a lower oxidation state for manganese ions as well as a denser morphology. Both characteristics could explain the lower capacity value obtained for this electrode. In contrast, the sample obtained at low temperature (KMn4) or by hydrothermal method presents a manganese oxidation state close to 4 and a more porous morphology. Indeed, in this case higher capacity values are obtained. At current density of 30 mA g−1, the KMn8, KMn4, and HKMn samples display a capacity retention of 88, 82, and 68%, respectively. The higher capacity loss obtained for the HKMn compound could be explained considering that the incorporation of Zn2+ in the structure gives rise to the stabilization of a ZnMn2O4 spinel-type phase. This compound is obtained in the discharge process but remains in the charge stage. Thus, when this spinel-type phase is obtained the capacity loss increases. Moreover, the stabilization of this phase is more favorable at low current rates where 100% of retention for all samples, before 50 cycles, was observed.

Item Type:Article
Uncontrolled Keywords:zinc-ion batteries (ZIBs); aqueous electrolyte; manganese oxide cathodes
Subjects:Sciences > Chemistry > Chemistry, Inorganic
ID Code:74843
Deposited On:03 Oct 2022 12:57
Last Modified:03 Oct 2022 14:00

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