Liquid Nonaqueous Electrolytes

Conductivities and Electrochemical Stabilities of Lithium Salts of Polyfluoroalkoxyaluminate Superweak Anions

“…One of the two Li-F͑Al͒ bonds is 1.821͑8͒ Å, shorter than any of the Li-O͑Al͒ bonds in either structure, which range from 1.978͑8͒ to 2.017͑8͒ Å. Therefore, the presence of the Al-F bond in the AlF͑HFPP) 3 Ϫ anion renders this anion much more strongly coordinating ͑and, presumably, more strongly ion-pairing͒ than the Al͑HFPP) 4 Ϫ anion. This explains why the conductivity of LiAlF͑HFPP) 3 in DME is so much lower than that of LiAl͑HFPP) 4 , despite the fact that the AlF͑HFPP) 3 Ϫ anion is smaller than Al͑HFPP) 4 Ϫ .…”

“…Therefore, the presence of the Al-F bond in the AlF͑HFPP) 3 Ϫ anion renders this anion much more strongly coordinating ͑and, presumably, more strongly ion-pairing͒ than the Al͑HFPP) 4 Ϫ anion. This explains why the conductivity of LiAlF͑HFPP) 3 in DME is so much lower than that of LiAl͑HFPP) 4 , despite the fact that the AlF͑HFPP) 3 Ϫ anion is smaller than Al͑HFPP) 4 Ϫ . Consistent with this, max for LiAlF͑HFPP) 3 , while lower than max for LiAl͑HFPP) 4 , occurs at a higher concentration than for LiAl͑HFPP) 4 .…”

Characterisation and properties of new ionic liquids with the difluoromono[1,2-oxalato(2-)-O,O′]borate anion

“…The conductivity of a pure ionic liquid mainly depends on its viscosity, ion sizes of anions and cations, and the ion-ion interaction [20]. Similar to the influence on the viscosity of the ionic liquid, the length of the alkyl group in the 1-alkyl-3-methylimidazolium cation also influences the conductivity.…”

Electrochemical characterization of electrolytes for lithium-ion batteries based on lithium difluoromono(oxalato)borate

“…Therefore, several years ago, we started the synthesis of lithium chelatoborates [8] and showed what kind of ligands can be used to join the boron atom. The most promising member of the class of lithium salts is lithium bis(oxalato)borate (LiBOB) [9].…”