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Comparative study on lithium borates as corrosion inhibitors of aluminum current collector in. lithium bis(fluorosulfonyl)imide electrolytes
- Comparative study on lithium borates as corrosion inhibitors of aluminum current collector in. lithium bis(fluorosulfonyl)imide electrolytes
- Park, K[Park, Kisung]; Yu, S[Yu, Sunghun]; Lee, C[Lee, Chulhaeng]; Lee, H[Lee, Hochun]
- DGIST Authors
- Park, K[Park, Kisung]; Lee, H[Lee, Hochun]
- Issue Date
- Journal of Power Sources, 296, 197-203
- Article Type
- Aluminum; Aluminum Current Collector; Bis(Fluorosulfonyl)Imide; Comparative Studies; Corrosion; Corrosion Inhibitor; Corrosion Inhibitors; Current Collector; Electric Current Collectors; Electrolytes; Ethylene; Ethylene Carbonate; Lithium; Lithium-Ion Batteries; Lithium Alloys; Lithium Bis(Fluorosulfonyl)Imide; Lithium Bis(Oxalato)Borate; Lithium Compounds; Lithium Difluoro(Oxalato)Borate; Lithium Hexafluorophosphate; Lithium Ion Batteries; Lithium Tetrafluoroborate; Oxalato; X Ray Photoelectron Spectroscopy
- Abstract Lithium bis(fluorosulfonyl)imide (LiFSI) is a promising salt that can possibly overcome the limitations of lithium hexafluorophosphate (LiPF6) in current Li-ion batteries (LIBs). Aluminum (Al) corrosion issue, however, is a major bottleneck for the wide use of LiFSI. This study investigates lithium borate salts as Al corrosion inhibitors in LiFSI electrolytes. Through a systematic comparison among lithium tetrafluoroborate (LiBF4), lithium bis(oxalato)borate (LiBOB), and lithium difluoro(oxalato)borate (LiDFOB), and LiPF6, the inhibition ability of the additives is revealed to be in the following order: LiDFOB > LiBF4 ≈ LiPF6 > LiBOB. In particular, the inhibition effect of LiDFOB is outstanding; the anodic behavior of Al in 0.8 M LiFSI + 0.2 M LiDFOB ethylene carbonate (EC)-based electrolyte is comparable to that of corrosion-free 1 M LiPF6 solution. The superior inhibition ability of LiDFOB is attributed to the formation of a passive layer composed of Al-F, Al2O3, and B-O species, as evidenced by X-ray photoelectron spectroscopy (XPS) measurements. A LiCoO2/graphite cell with 0.8 M LiFSI + 0.2 M LiDFOB electrolyte exhibits a rate capability comparable to a cell with 1 M LiPF6 solution, whereas a cell with 0.8 M LiFSI solution without LiDFOB suffers from poor power performance resulting from severe Al corrosion. © 2015 Elsevier B.V.
- Elsevier B.V.
- Related Researcher
Electrochemistry Laboratory for Sustainable Energy(ELSE)
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- Department of Energy Science and EngineeringElectrochemistry Laboratory for Sustainable Energy(ELSE)1. Journal Articles
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