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Investigation of the water-stimulated Mg2+ insertion mechanism in an electrodeposited MnO2 cathode using X-ray photoelectron spectroscopy.
Phys Chem Chem Phys. 2018 Jan 24; 20(4):2517-2526.PC

Abstract

Batteries based on magnesium chemistry are being widely investigated as an alternative energy storage system to replace lithium-ion batteries. Mg batteries have multiple challenges, especially on the cathode side. The divalent Mg ion has slow insertion kinetics in many metal oxide cathodes conventionally used in Li-ion batteries. One solution that has been explored is adding water molecules into an organic electrolyte, which has been shown to aid in Mg insertion and improve performance of manganese oxide (MnO2) cathodes. While there have been studies on Mg insertion mechanisms into MnO2 in solely aqueous or organic electrolytes for some crystalline MnO2 polymorphs, our work is focused on water-containing organic electrolyte, where an H2O to Mg ratio of 6 : 1 is present. In this study, we report results based on ex situ XPS experiments, including both angle resolved and depth profiling studies to assess the surface reactions and determine the mechanism of Mg insertion into an amorphous, electrodeposited MnO2 cathode. We propose that in this mixed electrolyte system, there is a combined insertion/conversion reaction mechanism whereby Mg and H2O molecules co-insert into the MnO2 structure and a reaction between H2O and Mg creates an observable Mg(OH)2 layer at the surface of the MnO2. A more full understanding of the role of the water molecules is important to aid in the future design of cathode materials, especially when determining potential ways to integrate metal oxides in Mg batteries.

Authors+Show Affiliations

Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA. slee@umd.edu.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29313861

Citation

Sahadeo, Emily, et al. "Investigation of the Water-stimulated Mg2+ Insertion Mechanism in an Electrodeposited MnO2 Cathode Using X-ray Photoelectron Spectroscopy." Physical Chemistry Chemical Physics : PCCP, vol. 20, no. 4, 2018, pp. 2517-2526.
Sahadeo E, Song J, Gaskell K, et al. Investigation of the water-stimulated Mg2+ insertion mechanism in an electrodeposited MnO2 cathode using X-ray photoelectron spectroscopy. Phys Chem Chem Phys. 2018;20(4):2517-2526.
Sahadeo, E., Song, J., Gaskell, K., Kim, N., Rubloff, G., & Lee, S. B. (2018). Investigation of the water-stimulated Mg2+ insertion mechanism in an electrodeposited MnO2 cathode using X-ray photoelectron spectroscopy. Physical Chemistry Chemical Physics : PCCP, 20(4), 2517-2526. https://doi.org/10.1039/c7cp06312a
Sahadeo E, et al. Investigation of the Water-stimulated Mg2+ Insertion Mechanism in an Electrodeposited MnO2 Cathode Using X-ray Photoelectron Spectroscopy. Phys Chem Chem Phys. 2018 Jan 24;20(4):2517-2526. PubMed PMID: 29313861.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Investigation of the water-stimulated Mg2+ insertion mechanism in an electrodeposited MnO2 cathode using X-ray photoelectron spectroscopy. AU - Sahadeo,Emily, AU - Song,Jaehee, AU - Gaskell,Karen, AU - Kim,Nam, AU - Rubloff,Gary, AU - Lee,Sang Bok, PY - 2018/1/10/pubmed PY - 2018/1/10/medline PY - 2018/1/10/entrez SP - 2517 EP - 2526 JF - Physical chemistry chemical physics : PCCP JO - Phys Chem Chem Phys VL - 20 IS - 4 N2 - Batteries based on magnesium chemistry are being widely investigated as an alternative energy storage system to replace lithium-ion batteries. Mg batteries have multiple challenges, especially on the cathode side. The divalent Mg ion has slow insertion kinetics in many metal oxide cathodes conventionally used in Li-ion batteries. One solution that has been explored is adding water molecules into an organic electrolyte, which has been shown to aid in Mg insertion and improve performance of manganese oxide (MnO2) cathodes. While there have been studies on Mg insertion mechanisms into MnO2 in solely aqueous or organic electrolytes for some crystalline MnO2 polymorphs, our work is focused on water-containing organic electrolyte, where an H2O to Mg ratio of 6 : 1 is present. In this study, we report results based on ex situ XPS experiments, including both angle resolved and depth profiling studies to assess the surface reactions and determine the mechanism of Mg insertion into an amorphous, electrodeposited MnO2 cathode. We propose that in this mixed electrolyte system, there is a combined insertion/conversion reaction mechanism whereby Mg and H2O molecules co-insert into the MnO2 structure and a reaction between H2O and Mg creates an observable Mg(OH)2 layer at the surface of the MnO2. A more full understanding of the role of the water molecules is important to aid in the future design of cathode materials, especially when determining potential ways to integrate metal oxides in Mg batteries. SN - 1463-9084 UR - https://www.unboundmedicine.com/medline/citation/29313861/Investigation_of_the_water_stimulated_Mg2+_insertion_mechanism_in_an_electrodeposited_MnO2_cathode_using_X_ray_photoelectron_spectroscopy_ L2 - https://doi.org/10.1039/c7cp06312a DB - PRIME DP - Unbound Medicine ER -
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