Abstract: Electrolytes that include one or more salts, one or more acetamide-based solvents, and optionally, one or more non-acetamide-based solvents. In some embodiments, disclosed electrolytes can be used in electrochemical devices, such as alkaline-metal-based (e.g., lithium-based) secondary battery cells, among others. Also disclosed are electrochemical devices that incorporate disclosed electrolytes.

Abstract: Sulfonyl-based solvent systems for electrolytes used in electro-chemical devices, such as secondary batteries. In some embodiments, a solvent system of the disclosure includes a sulfonyl (—SO2—)-based solvent optionally in combination with one or more different sulfonyl-based solvents and/or one or more non-sulfonyl-based solvents. Five example chemical structures for a sulfonyl-based solvent usable in a sulfonyl-based solvent system of this disclosure are disclosed. Also disclosed are electrolytes that include one or more salts, such as one or more alkali-metal salts, dissolved in a sulfonyl-based solvent system of the present disclosure. Proper formulation of a disclosed electrolyte can lead to one or more benefits, including but not limited to, improved cycle life, improved low-temperature operation, and reduced flammability.