Ionic Conductivity Studies of LiBOB-doped Silyl Solvent Blend Electrolytes for Lithium-Ion Battery Applications

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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 C to 50 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 s0, T0, and Ea, which correspond closely to conductivity and viscosity. All the electrolytes produced conductivities above the 1.0 mS cm1 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 s25 at 1.99 ± 0.02 mS cm1.