Journal of Power Sources, Vol.272, 190-195, 2014
Ionic conductivity studies of LiBOB-doped silyl solvent blend electrolytes for lithium-ion battery applications
The ionic conductivity of LiBOB-doped electrolytes containing two silyl solvents, bis[2-(2-methoxyethoxy)ethoxy] dimethylsilane, 1, and [2-(2-methoxyethoxy)ethoxy] trimethylsilane,2, was measured from -10 degrees C to 50 degrees C using AC impedance spectroscopy to assess their potential use in commercial Li-ion cells. The effects of salt concentration, solvent composition, and temperature on the conductivity of the electrolytes are reported. In addition, conductivity data were fit using the Vogel-Tamman-Fulcher (VTF) equation to obtain the parameters sigma(0), T-0, and E-a, which correspond closely to conductivity and viscosity. All the electrolytes produced conductivities above the 1.0 mS cm(-1) threshold required for commercial application. The 1:1 (vl) solvent composition possesses the highest conductivity, with the optimal 0.8 M salt-loading yielding the highest sigma(25) at 1.99 +/- 0.02 mS cm(-1). (C) 2014 Elsevier B.V. All rights reserved.
Keywords:Lithium-ion batteries;Lithium bis(oxalato)borate;Organosilicon electrolyte;Electrolyte solvent blend