Corrosion/passivation of aluminum current collector in bis(fluorosulfonyl) imide-based ionic liquid for lithium-ion batteries
- Authors
- Cho, Erang; Mun, Junyoung; Chae, Oh B.; Kwon, Oh Min; Kim, Hyung-Tae; Ryu, Ji Heon; Kim, Young Gyu; Oh, Seung M.
- Issue Date
- Aug-2012
- Publisher
- ELSEVIER SCIENCE INC
- Keywords
- Lithium-ion batteries; Ionic liquids; Aluminum current collector; Corrosion; Passivation layer
- Citation
- ELECTROCHEMISTRY COMMUNICATIONS, v.22, pp.1 - 3
- Journal Title
- ELECTROCHEMISTRY COMMUNICATIONS
- Volume
- 22
- Start Page
- 1
- End Page
- 3
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/87357
- DOI
- 10.1016/j.elecom.2012.05.018
- ISSN
- 1388-2481
- Abstract
- The corrosion behavior of aluminum foil that is used as the positive current collector for lithium-ion batteries is studied in N-methyl-N-propyl-pyrrolidinium bis(fluorosulfonyl)imide (PMPyr-FSI), which is considered as a highly attractive solvent due to a very low viscosity. This work reports that FSI anion is corrosive for aluminum foil upon anodic polarization (>4.0 V vs. Li/Li+). The pitting corrosion is, however, greatly reduced by adding lithium hexafluorophosphate (LiPF6). The anion of the salt is known to be a corrosion inhibitor for aluminum. It likely reacts to generate hydrofluoric acid that then attacks the native aluminum oxide (Al2O3) to produce a strong passivation layer comprising aluminum fluoride (AlF3). Resultantly, the high rate capability, which is the potential merit achievable by using the FSI-containing ionic liquid solvent, can be implemented with a LiCoO2 positive electrode. (C) 2012 Elsevier B.V. All rights reserved.
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