ELECTROLYTE COMPOSITION FOR LITHIUM-ION CELLS WITH SILICON ELECTRODES

An electrolyte composition for use in a battery system including a silicon-based negative electrode having active material particles is provided. The electrolyte composition includes a polar solvent selected from the group consisting of ethylene carbonate, propylene carbonate, sulfolane, γ-butyrolactone, and combinations thereof and at least one lithium salt dissolved in the polar solvent at a concentration of at least 2 moles of the at least one lithium salt per 1 liter of the polar solvent. The at least one lithium salt and the polar solvent add dipoles to the electrolyte composition configured for reducing an electric field present at a surface of each of the active material particles in the silicon-based negative electrode of the battery system.