Physical and electrochemical properties of lithium bis(oxalate)borate
By Agnieszka Swiderska-Mocek and Dominika Naparstek
Published in Electrochimica Acta
2016
Abstract
A lithium bis(oxalate)borate (LiBOB) salt in many of the common organic solvents (cyclic and linear carbonates, ionic liquid, sulfolane and gamma-butyrolactone) were tested as electrolytes for Li-ion batteries. These electrolytes were obtained by dissolution of LiBOB in sulfolane and in a mixture of propylene carbonate and ethylene carbonate (PC:EC (1:1 wt)); propylene carbonate and dimethyl carbonate (PC:DMC (1:1 wt)); N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulphonyl)imide and \PC\ (MePrPyrNTf2:PC (2:1 wt)); gamma-butyrolactone and vinylene carbonate (GBL:VC (9:1 wt)). Such properties of the novel electrolyte systems as flammability, solubility, conductivity and electrochemical stability were investigated. The resulting electrolytes have good cathode and anode stability, high conductivity (almost 6 mS cm?1 for 0.3 M LiBOB in MePrPyrNTf2:PC (2:1 wt)) and some of them are practically non-flammable (the flash point above 164