Synthesis of novel lithium salts with doubly charged anions for secondary batteries; Synthese von Lithiumsalzen mit zweifach geladenen Anionen fuer Sekundaerbatterien

Lithium salts with doubly charged anions have been prepared from {alpha},{omega}-perfluoro alkanebis(sulfonylfluorides), bis(trifluoromethylsulfonyl)methane, and sodium trifluoromethylsulfonyl(trimethylsilyl) amide; Li{sub 2}[R-(CF{sub 2}){sub n}-R`] with R = SO{sub 2}O, R` = SO{sub 2}NSO{sub 2}CF{sub 3} for 6a (n = 1), R = R` = SO{sub 2}NSO{sub 2}CF{sub 3} 5a (n = 1), R = SO{sub 2}NSO{sub 2}CF{sub 3}, R` = SO{sub 2}C(SO{sub 2}CF{sub 3}){sub 2} for 7a (n = 1) and R = R` = SO{sub 2}C(SO{sub 2}CF{sub 3}){sub 2} for 8a, c (n = 1, 3). The formation and physical properties (conductivity and {sup 19}F NMR) of these compounds are discussed. An X-ray structure analysis (T = 293 K) was performed for the di-caesium hexafluoropropanyl-1,3-bis[sulfonyl-b is(trifluoromethylsulfonyl)methanide] (15c). (orig.) 26 refs.