RT Journal Article
T1 Stable manganese-oxide composites as cathodes for zn-ion batteries: interface activation from In situ layer electrochemical deposition under 2 V
A1 Álvarez Serrano, Inmaculada
A1 Almodóvar Losada, Paloma
A1 Giraldo, David
A1 Llopis, Francisco
A1 Solsona, Benjamin
A1 López García, María Luisa
AB A set of multiphase manganese-oxide composite materials (Mn2O3@Mn3O4 and Mn3O4@Mn5O8), and a birnessite-type KxMnO2 oxide are prepared and evaluated as cathodes for Zn-ion batteries. The species formed when the electrodes are subjected to 2 V in aqueous solutions of MnSO4 and ZnSO4 are analyzed, suggesting an interphase activation leading to enhancement of electrochemical response. For the first time, it is shown that a Zn4(SO4)(OH)6.xH2O phase coats the composite-type electrodes in the charging stage, contributing to extending the lifetime of the batteries. KxMnO2 electrode with layered birnessite structure shows long cycling life at low current densities (122 mAh g−1 at 30 mA g−1 after 50 cycles) and good efficiencies (ca. 99%) in the 0.1 Mn2+ electrolyte. In contrast, in the 0.5 m Mn2+ electrolyte, high values of specific capacity are delivered by the cell at higher rates, that is, 150 mAh g−1 at 600 mA g−1. In Mn5O8@Mn3O4 the good performance is due to the synergistic effect of the two compounds forming the composite. Thus, after more than 100 cycles this composite displays specific capacity values of 175 mAh g−1 at 2150 mA g−1 in the 0.1 m Mn2+/1 m Zn2+ electrolyte.
PB Wiley VCH
YR 2022
FD 2022-01-15
LK https://hdl.handle.net/20.500.14352/113199
UL https://hdl.handle.net/20.500.14352/113199
LA eng
NO I. Álvarez-Serrano, P. Almodóvar, D. A. Giraldo, F. Llopis, B. Solsona, M. L. López, Stable Manganese-Oxide Composites as Cathodes for Zn-Ion Batteries: Interface Activation from In Situ Layer Electrochemical Deposition under 2 V. Adv. Mater. Interfaces 2022, 9, 2101924. https://doi.org/10.1002/admi.202101924
NO Ministerio de Economía, Comercio y Empresa
DS Docta Complutense
RD 6 abr 2025