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@ARTICLE{Aslanbas:848383,
author = {Aslanbas, Özgür and Durmus, Yasin Emre and Tempel,
Hermann and Hausen, Florian and Ein-Eli, Yair and Eichel,
Rüdiger-A. and Kungl, Hans},
title = {{E}lectrochemical analysis and mixed potentials theory of
ionic liquid based {M}etal–{A}ir batteries with {A}l/{S}i
alloy anodes},
journal = {Electrochimica acta},
volume = {276},
issn = {0013-4686},
address = {New York, NY [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2018-03624},
pages = {399 - 411},
year = {2018},
abstract = {Aluminium and silicon, when coupled with an air cathode in
an electrochemical cell may provide theoretical specific
energies of up to 8146 mWh/g and 8470 mWh/g. Proof of
concept for the discharge in cells with ionic liquid
EMIm(HF)2.3F electrolyte had been established in 2009 for
silicon and in 2015 for aluminium. The objective of the
present work is the investigation of discharge behavior and
corrosion in this type of cell using binary Al/Si alloys as
anodes. Al/Si alloys with nine different compositions were
prepared by an arc melting process and shaped to anodes.
Microstructure of the anodes in the initial state was
evaluated with respect to the fractions of its constituents.
Al/Si–air primary full cells were investigated with
respect to voltages during OCV and discharge during
intermediate term (20 h) runs under current densities of
250 μA/cm2. Voltages decrease with Si-content in the
alloys following trends with quantitatively different
characteristics for the hypoeutectic, intermediate
hypereutectic and the alloys with high Si content. SEM
analysis of surface morphology of the anodes after discharge
experiments indicates that for all alloys the discharge
capacity results mostly from the oxidation of the aluminium.
Potentiodynamic polarization measurements were conducted in
order to determine corrosion potentials for the alloys and
analyzed with approaches based on mixed potential theory
including galvanic coupling. The results are discussed in
terms of Evans diagrams; thereby approaches based on
alternative scenarios for the galvanic coupling are
examined.},
cin = {IEK-9},
ddc = {540},
cid = {I:(DE-Juel1)IEK-9-20110218},
pnm = {131 - Electrochemical Storage (POF3-131) / HITEC -
Helmholtz Interdisciplinary Doctoral Training in Energy and
Climate Research (HITEC) (HITEC-20170406)},
pid = {G:(DE-HGF)POF3-131 / G:(DE-Juel1)HITEC-20170406},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000433042500043},
doi = {10.1016/j.electacta.2018.04.176},
url = {https://juser.fz-juelich.de/record/848383},
}