Projects per year
Abstract
The passivity of aluminum is detrimental to its performance as an anode in batteries. Soaking of native oxide-covered aluminum in a chloroaluminate deep eutectic solvent gradually activates the electrode surface, which is reflected in a continuously decreasing open circuit potential. The underlying processes were studied by analyzing the 3 to 7 nm thick layer of native oxide after increasing periods of soaking with secondary neutral mass spectrometry, X-ray photoelectron spectroscopy, and energy-dispersive spectroscopy in a transmission electron microscope. They consistently show permeation of electrolyte species into the layer associated with gradual swelling. After extended periods of soaking at open circuit potentials, local deposits of a range of foreign metals have been found in scanning electron microscopy images of the electrode surface. The pitting corrosion is caused by trace metal ion impurities present in the electrolyte and results in highly nonuniform current density distribution during discharge/charge cycling of battery cells as shown by local deposits of aluminum. The processes during soaking at open circuit potentials have been monitored by electrochemical impedance spectroscopy and could be analyzed by fitting an equivalent circuit model for pitting corrosion.
Original language | English |
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Pages (from-to) | 882-892 |
Journal | ACS Applied Materials & Interfaces |
Volume | 15 |
Issue number | 1 |
Early online date | 27 Dec 2022 |
DOIs | |
Publication status | Published - Jan 2023 |
Keywords
- aluminum anode
- aluminum-sulfur battery
- chloroaluminate electrolyte
- corrosion
- local current distribution
- native oxide
- pitting
- trace metal impurities
ASJC Scopus subject areas
- General Materials Science
Fields of Expertise
- Advanced Materials Science
Treatment code (Nähere Zuordnung)
- Basic - Fundamental (Grundlagenforschung)
- Experimental
Fingerprint
Dive into the research topics of 'Corrosion of Passive Aluminum Anodes in a Chloroaluminate Deep Eutectic Solvent for Secondary Batteries: The Bad, the Good, and the Ugly'. Together they form a unique fingerprint.Projects
- 2 Finished
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EU - AMAPOLA - A Marketable Polymer based Al-S battery
Kothleitner, G. (Co-Investigator (CoI)) & Gollas, B. (Co-Investigator (CoI))
1/10/20 → 30/09/22
Project: Research project
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EU - SALBAGE - Sulfur-Aluminium Battery with Advanced Polymeric Gel Electrolytes
Gollas, B. (Co-Investigator (CoI)) & Kothleitner, G. (Co-Investigator (CoI))
1/11/17 → 31/10/21
Project: Research project