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1‐Ethyl‐3‐Methyl‐Imidazolium Bis (Trifluoromethane‐ sulfonyl) Imide as an Electrolyte Additive in LiFePO 4 ‐ Based Batteries for Suppressing Aluminum Corrosion
Author(s) -
Shangguan Xuehui,
Jia Guofeng,
Li Faqiang,
Liu Suqin,
Yang Guowei,
Wu Kang,
Wu Zhijian
Publication year - 2018
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201700833
Subject(s) - electrolyte , ionic liquid , imide , lithium (medication) , inorganic chemistry , materials science , x ray photoelectron spectroscopy , corrosion , cyclic voltammetry , electrochemistry , sulfonyl , chemical engineering , chemistry , alkyl , organic chemistry , polymer chemistry , metallurgy , catalysis , electrode , medicine , engineering , endocrinology
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 (LiFePO 4 ) 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 LiFePO 4 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.