Corrosion resistance mechanism of chromate conversion coated aluminium current collector in lithium-ion batteries. (September 2019)

• Record Type: Journal Article
• Authors: Piao, Nan; Wang, Li; Anwar, Tauseef; Feng, Xuning; Sheng, Si'e; Tian, Guangyu; Wang, Jianlong; Tang, Yaping; He, Xiangming
• Is Part Of: Corrosion science. Volume 158(2019)
• Publication Date: 2019-09
• Subjects: Aluminum current collector -- Corrosion -- LiTFSI-based electrolytes -- Chromate conversion coating (CCC) -- Imide salts -- Lithium-ion batteries; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2019.108100
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: A facile and economical chromate conversion coating (CCC) is pre-formed on the surface of aluminum current collector. The CCC-Al current collector has good conductivity. This CCC enables the application of LiTFSI-based electrolytes in lithium-ion batteries. Abstract: The chromate conversion coating (CCC) is pretreated on the surface of aluminum current collector to effectively suppress aluminum corrosion in the lithium bis[(trifluoromethyl)sulfonyl] imide (LiTFSI)-based electrolytes. The harsh electrochemical tests show that the corrosion current density of CCC-Al is only about 1% of that of pristine aluminum. In NMC333||Li cells, the capacity retention is over 90% for the cell with CCC-Al current collector, while it is only 12% for the cell with pristine Al. This CCC-Al current collector enables imide salts to be used in LIBs, which paves a way to explore new battery chemistry for the next-generation high-performance battery.