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Corrosion suppression of aluminium current collectors within Li-ion cells using 3-methoxypropionitrile-based electrolytes

Electrolytes containing lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) as the conductive salt generally possess the high moisture tolerance and innate HF-free generation in moisture environments in comparison with those containing lithium hexafluorophosphate (LiPF6). However, severe corrosion of...

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Bibliographic Details
Published in:Electrochimica acta 2022-11, Vol.431, p.141105, Article 141105
Main Authors: Yen, Chih-Han, Neale, Alex R., Lim, Jungwoo, Bresser, Dominic, Hardwick, Laurence J., Hu, Chi-Chang
Format: Article
Language:English
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Summary:Electrolytes containing lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) as the conductive salt generally possess the high moisture tolerance and innate HF-free generation in moisture environments in comparison with those containing lithium hexafluorophosphate (LiPF6). However, severe corrosion of the aluminium current collector presently hinders the use of LiTFSI within Li-ion cells. Here 3-methoxypropionitrile (MPN) is introduced as an alternative, non-toxic solvent into the electrolyte formulation to explore the effects on Al corrosion. The MPN-containing electrolytes can suppress Al corrosion via the generation of an aluminium nitride dominated protection layer during charge-discharge cycling, as confirmed by X-ray photoelectron spectroscopy. For the cycling performance of Li||LiNi0.6Mn0.2Co0.2O2 half cells, the increasing addition of MPN solvent improves capacity retention and suppresses the corrosion of Al current collectors in LiTFSI containing electrolytes.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2022.141105