Journal Article

FZJ-2020-02943

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Influence of LiPF 6 on the Aluminum Current Collector Dissolution in High Voltage Lithium Ion Batteries after Long-Term Charge/Discharge Experiments

Streipert, B. ; Röser, S. ; Kasnatscheew, J.FZJ* ; Janßen, P. ; Cao, X. ; Wagner, R. ; Cekic-Laskovic, I.FZJ* ; Winter, M. (Corresponding author)FZJ*

2017
IOP Publishing Bristol

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Please use a persistent id in citations: doi:10.1149/2.0671707jes

Abstract: The long-term influence of the most commonly used conducting salt in electrolyte formulations, lithium hexafluorophosphate, on the aluminum current collector stability in high voltage lithium ion batteries was investigated. By means of different surface sensitive techniques (scanning electron microscopy, atomic force microscopy and X-ray photoelectron spectroscopy), after 1003 simulated charge/discharge cycles, anodic aluminum dissolution was found to take place at elevated potential (4.95 V vs. Li/Li+) but only to a minor extent. Pitting of the Al collector could be assessed in the nanometer range. Furthermore, it could be revealed that local pit formation is related to local "native" grooves on the aluminum foil, which develop during the production process of the aluminum foil. The obtained results were evaluated and compared to a reference electrolyte containing the alternative conducting salt lithium bis(trifluoromethanesulfonyl)imide. Our findings imply two possible mechanisms for the occurring Al dissolution behavior at elevated potentials. Either, an accelerated aluminum dissolution process, or a continuous passivation/LiPF6-decomposition process.

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Contributing Institute(s):

1. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IEK-12)

Research Program(s):

1. 131 - Electrochemical Storage (POF3-131) (POF3-131)

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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