Journal
ENERGY TECHNOLOGY
Volume 6, Issue 9, Pages 1667-1674Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ente.201700833
Keywords
Aluminum corrosion; EMITFSI; LiTFSI; Lithium-ion batteries
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Funding
- Natural Science Foundation of China [U1507106, U1507114]
- Key Plan Research and Transformation of Qinghai Province [2016-GX-101]
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Lithium bis (trifluoromethanesulfonyl) imide (LiTFSI) is a potentially useful electrolyte salt for use in Li-ion batteries. LiTFSI, however, is associated with severe corrosion of Al current collectors. This study investigates the ionic liquid 1-ethyl-3-methyl-imidazolium bis (trifluoromethanesulfonyl) imide (EMITFSI) as an Al corrosion inhibitor in LiTFSI electrolytes. Different concentrations of EMITFSI are used as additives in 1 m LiTFSI-based electrolytes to systematically assess the performance of lithium iron phosphate (LiFePO4) cathodes. The results from electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Cyclic voltammetry (CV) indicate that adding EMITFSI into LiTFSI-based electrolytes can effectively prevent severe corrosion of Al caused by LiTFSI-based electrolytes. The LiFePO4 cells that use 1 m LiTFSI + 11% EMITFSI-based electrolytes demonstrate a superior rate capability and cycling stability when compared to cells that use the LiTFSI-based electrolyte.
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