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Comparative study on lithium borates as corrosion inhibitors of aluminum current collector in. lithium bis(fluorosulfonyl)imide electrolytes

Title
Comparative study on lithium borates as corrosion inhibitors of aluminum current collector in. lithium bis(fluorosulfonyl)imide electrolytes
Authors
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
2015-11-20
Citation
Journal of Power Sources, 296, 197-203
Type
Article
Article Type
Article
Keywords
AluminumAluminum Current CollectorBis(Fluorosulfonyl)ImideComparative StudiesCorrosionCorrosion InhibitorCorrosion InhibitorsCurrent CollectorElectric Current CollectorsElectrolytesEthyleneEthylene CarbonateLithiumLithium-Ion BatteriesLithium AlloysLithium Bis(Fluorosulfonyl)ImideLithium Bis(Oxalato)BorateLithium CompoundsLithium Difluoro(Oxalato)BorateLithium HexafluorophosphateLithium Ion BatteriesLithium TetrafluoroborateOxalatoX Ray Photoelectron Spectroscopy
ISSN
0378-7753
Abstract
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.
URI
http://hdl.handle.net/20.500.11750/2576
DOI
10.1016/j.jpowsour.2015.07.052
Publisher
Elsevier B.V.
Related Researcher
  • Author Lee, Ho Chun Electrochemistry Laboratory for Sustainable Energy(ELSE)
  • Research Interests Lithium-ion batteries; Novel Materials for rechargeable batteries; Novel energy conversion;storage systems; Electrochemistry; 리튬이차전지; 이차전지용 신규 전극 및 전해액; 신규 에너지변환 및 저장 시스템; 전기화학
Files:
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Collection:
Energy Science and EngineeringElectrochemistry Laboratory for Sustainable Energy(ELSE)1. Journal Articles


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