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Electrochemical behavior of zinc particles with silica based coatings as anode material for zinc air batteries with improved discharge capacity

Title data

Schmid, Manuela ; Willert-Porada, Monika:
Electrochemical behavior of zinc particles with silica based coatings as anode material for zinc air batteries with improved discharge capacity.
In: Journal of Power Sources. Vol. 351 (March 2017) . - pp. 115-122.
ISSN 0378-7753
DOI: https://doi.org/10.1016/j.jpowsour.2017.03.096

Project information

Project title:
Project's official titleProject's id
Zink-Luft-Batterien als stationärer Energiespeicher Grant No. 1025-12No information

Project financing: 7. Forschungsrahmenprogramm für Forschung, technologische Entwicklung und Demonstration der Europäischen Union
Bayerische Forschungsstiftung

Abstract in another language

Silica coatings on zinc particles as anode material for alkaline zinc air batteries are expected to reduce
early formation of irreversible ZnO passivation layers during discharge by controlling zinc dissolution
and precipitation of supersaturated zincates, Zn(OH)4
2-. Zinc particles were coated with SiO2 (thickness:
15 nm) by chemical solution deposition and with Zn2SiO4 (thickness: 20 nm) by chemical vapor deposition.
These coatings formed a Si(OH)4 gel in aqueous KOH and retarded hydrogen evolution by 40%. By
treatment in aqueous KOH and drying afterwards, the silica coatings were changed into ZnO-K2O$SiO2
layers. In this work, the electrochemical performance of such coated zinc particles is investigated by
different electrochemical methods in order to gain a deeper understanding of the mechanisms of the
coatings, which reduce zinc passivation. In particular, zinc utilization and changes in internal resistance
are investigated. Moreover, methods for determination of diffusion coefficients, charge carrier numbers
and activation energies for electrochemical oxidation are determined. SiO2-coated zinc particles show
improved discharge capacity (CVD-coated zinc: 69% zinc utilization, CSD-coated zinc: 62% zinc utilization)
as compared to as-received zinc (57% zinc utilization) at C/20 rate, by reducing supersaturation of
zincates. Additionally, KOH-modified SiO2-coated zinc particles enhance rechargeability after 100%
depth-of-discharge.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Zinc anode; Silica coatings; Electrochemical oxidation behavior; Discharge capacity; Charge carrier numbers; Electrochemical activation energies
Institutions of the University: Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Materials Processing
Faculties > Faculty of Engineering Science > Ehemalige Professoren > Chair Materials Processing - Univ.-Prof. Dr. Monika Willert-Porada
Faculties > Faculty of Engineering Science > Ehemalige Professoren
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 500 Natural sciences
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 31 Mar 2017 05:59
Last Modified: 14 Mar 2019 07:17
URI: https://eref.uni-bayreuth.de/id/eprint/36706