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Development of silica based coatings on zinc particles for improved oxidation behavior in battery applications

Titelangaben

Schmid, Manuela ; Schadeck, Ulrich ; Willert-Porada, Monika:
Development of silica based coatings on zinc particles for improved oxidation behavior in battery applications.
In: Surface and Coatings Technology. Bd. 310 (2017) . - S. 51-58.
ISSN 0257-8972
DOI: 10.1016/j.surfcoat.2016.12.044

Angaben zu Projekten

Projekttitel:
Offizieller ProjekttitelProjekt-ID
Zink-Luft-Batterien als stationäre EnergiespeicherOhne Angabe

Projektfinanzierung: Andere
Bayerische Forschungsstiftung (Grant No. 1025-12)
Technologie-Allianz Oberfranken

Abstract

ZnO and Zn(OH)2 layers formed on zinc metal upon contact with aqueous media, like 6 M KOH electrolyte used in zinc air batteries, do not provide sufficient protection against further zinc oxidation leading to hydrogen evolution as well as self-discharge of the battery itself. In this work, the syntheses of artificial coatings based on silica, SiO2, were investigated, which should improve zinc metal oxidation stability to reduce aqueous corrosion of battery grade zinc particles. For synthesis of silica coatings the precursor tetraethyl orthosilicate (TEOS) was used. Chemical vapor deposition (CVD) in synthetic air and chemical solution deposition (CSD) under argon in polyol media were used for synthesis of these coatings on zinc under different thermal conditions. Zinc silicate formation was observed upon CVD while silica was formed upon CSD. The capability of the silicate based coatings to enhance oxidation resistance of zinc was analyzed via volumetric measurement of hydrogen evolution upon wet corrosion in 6 M KOH. Thermodynamic calculations were used to analyze the composition of the synthesized coatings and their compositional changes in concentrated KOH. As a result, silicate based coatings are able to reduce zinc corrosion by almost 40% by formation of protective layers in 6 M KOH. These results were confirmed by hot air corrosion tests.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: Coating of battery grade zinc; Silicate based coatings; Chemical vapor deposition; Chemical solution deposition; Wet corrosion; Thermodynamic calculations
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften > Ehemalige Professoren > Lehrstuhl Werkstoffverarbeitung - Univ.-Prof. Dr. Monika Willert-Porada
Forschungseinrichtungen > Forschungsstellen > ZET - Zentrum für Energietechnik
Fakultäten
Fakultäten > Fakultät für Ingenieurwissenschaften
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Werkstoffverarbeitung
Forschungseinrichtungen
Forschungseinrichtungen > Forschungsstellen
Fakultäten > Fakultät für Ingenieurwissenschaften > Ehemalige Professoren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 02 Jan 2017 14:29
Letzte Änderung: 02 Jan 2017 14:29
URI: https://eref.uni-bayreuth.de/id/eprint/35608