4.6 Article

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

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ELECTROCHIMICA ACTA
卷 431, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2022.141105

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资金

  1. EPSRC [EP/R020744/1, PR16195]
  2. Faraday Institution Project CATMAT [EP/S003053/1, FIRG016]
  3. Ministry of Science and Technology (MOST) of Taiwan [MOST 109-2923-E-007-005, 110-2923-E-007-011]
  4. German Ministry of Education and Research (BMBF) [03XP0306C]

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The addition of 3-methoxypropionitrile (MPN) to electrolytes containing lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) can effectively suppress aluminum corrosion and improve the cycling performance of lithium-ion batteries.
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||LiNi0.6Mn0.2-Co0.2O2 half cells, the increasing addition of MPN solvent improves capacity retention and suppresses the corrosion of Al current collectors in LiTFSI containing electrolytes.

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