Ionic liquid prepared through diimine (vikane) and (perfluoroalkglsulfonyl fluorosulfonyl group) imine alkali salt

Abstract

The invention provides an ionic liquid consisting of the anions of diimine (vikane) and (perfluoroalkglsulfonyl fluorosulfonyl group) imine and the cation of sulfonium salt, ammonium salt or phosphor salt, as well as method for preparing the ionic liquid through diimine (vikane) and (perfluoroalkglsulfonyl fluorosulfonyl group) imine alkali salt. The ionic liquid can be used as an electrolyte material and applied on the fields like secondary lithium ion batteries, super capacitors, etc.

Description

technical field [0001] The present invention relates to ionic liquids, in particular to two (fluorosulfonyl) imides (H[N(SO 2 F) 2 ], referred to as H[FSI]) and (perfluoroalkylsulfonylfluorosulfonyl)imine (H[R f SO 2 NSO 2 F]), referred to as H[R f FSI];R f =C m f 2m+1 , m=1-8) anions and sulfonium salts, ammonium salts or phosphonium salt cations, and bis(fluorosulfonyl)imide (H[N(SO 2 f) 2 ]) and (perfluoroalkylsulfonylfluorosulfonyl)imine (H[R f SO 2 NSO 2 F], R f =C m f 2m+1 , m=1-8) alkali metal salt (M[N(SO 2 F) 2 ], M[R f SO 2 NSO 2 F)]; M=Li, Na, K, Rb, Cs) The method for preparing the ionic liquid also relates to the application of the ionic liquid as an electrolyte material in secondary lithium (ion) batteries, supercapacitors and other fields. Background technique [0002] Bis(fluorosulfonyl)imide (H[N(SO 2 F) 2 ], hereinafter referred to as H[FSI]) and (perfluoroalkylsulfonylfluorosulfonyl)imine (H[R f SO 2 NSO 2 F)], R f =C m f 2m+1 ,...

AI Technical Summary

Problems solved by technology

The second and third step reactions of this preparation method have the following obvious disadvantages: 1) use AsF 3 When preparing H[FSI] as a fluorinating agent, there is FSO in the reaction process 3 H (boiling point 165°C) is formed, and its boiling point is very close to that of product H[FSI] (boiling point 170°C) (J.K.Ruff et al, Inorg.Synth.1968, 11, 138); product H[FSI] and by-products POCl 3 Formation of azeotrope (H[FSI].POCl 3 , 1:1) (J.K.Ruff, Inorg.Chem.1967, 6, 2108), and the boiling point and FSO 3 The proximity of H makes the separation and purification of H[FSI] very difficult

due to FSO 2 The use of F gas makes the method reaction condition harsh, complex operation, and the productive rate of product is not high (D.H.Richard et al, US 5874616,1999); 3) by trifluoromethanesulfonyl trichlorophosphazene (CF 3 SO 2 N=PCl 3 ) compound with chlorosulfonic acid (ClSO 3 H) reaction or chlorosulfonyl trichlorophosphazene ((ClSO 2 N=PCl 3 )) and trifluoromethanesulfonic acid (CF 3 SO 3 H) reaction to obtain (trifluoromethylsulfonyl chlorosulfonyl) imide (HN(SO 2 Cl)(SO 2 CF 3 )), the method synthesizes HN(SO 2 Cl)(SO 2 CF 3 ) yield is higher, but HN(SO 2 Cl)(SO 2 CF 3 ) reacts with a fluorinating reagent to carry out fluorination, the same problems as product separation difficulties and low purity will be encountered when the aforementioned preparation of H[FSI] is encountered (K.Xu et al, Inorg.Chem.Commun.1999, 2, 26)

4) from trifluoromethanesulfonamide potassium salt (CF 3 SO 2 NHK) and fluorosulfonic anhydride (FSO 2 ) 2 O) Reaction preparation, but fluorosulfonic anhydride is highly toxic, therefore, it is not suitable for large-scale preparation (S.Maehama et al, JP 2005200359, 2005)

And by H[CF 3 The ionic liquid synthesized by FSI] is rarely reported (S.Maehama et al, JP 2005200359, 2005)

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