A non-aqueous electrolyte composition comprising: a) one or more sodium-containing salts selected from the group consisting of sodium tetrafluoroborate (NaBF 4) and sodium hexafluorophosphate (NaPF 6); and b) a solvent system which comprises: i) a first solvent component which comprises one or more organo carbonate-based solvents; and ii) a second solvent component which comprises one or more surfactants in an amount of >0.5 to ≤10% by weight of the solvent system, wherein the one or more surfactants are selected from the group consisting of: • anionic surfactants selected from carboxylates; sulfates; sulfonates selected from docusates and alkyl benzene sulfonates; and phosphate esters; • cationic surfactants selected from RN + H 3 Cl -, RN + (CH 3) 3 Cl -, diotadecyldimethylammonium chloride, cetyl pyridinium chloride, benzalkonium chloride, hexadecyl trimethylammonium chloride (CTAC) and hexadecyl trimethylammonium bromide (CTAB); and • non-ionic surfactants selected from polyol esters, polyoxyethylene esters, and poloxamers. a) one or more sodium-containing salts selected from the group consisting of sodium tetrafluoroborate (NaBF 4) and sodium hexafluorophosphate (NaPF 6); and b) a solvent system which comprises: i) a first solvent component which comprises one or more organo carbonate-based solvents; and ii) a second solvent component which comprises one or more surfactants in an amount of >0.5 to ≤10% by weight of the solvent system, wherein the one or more surfactants are selected from the group consisting of: • anionic surfactants selected from carboxylates; sulfates; sulfonates selected from docusates and alkyl benzene sulfonates; and phosphate esters; • cationic surfactants selected from RN + H 3 Cl -, RN + (CH 3) 3 Cl -, diotadecyldimethylammonium chloride, cetyl pyridinium chloride, benzalkonium chloride, hexadecyl trimethylammonium chloride (CTAC) and hexadecyl trimethylammonium bromide (CTAB); and • non-ionic surfactants selected from polyol esters, polyoxyethylene esters, and poloxamers. i) a first solvent component which comprises one or more organo carbonate-based solvents; and ii) a second solvent component which comprises one or more surfactants in an amount of >0.5 to ≤10% by weight of the solvent system, wherein the one or more surfactants are selected from the group consisting of: • anionic surfactants selected from carboxylates; sulfates; sulfonates selected from docusates and alkyl benzene sulfonates; and phosphate esters; • cationic surfactants selected from RN + H 3 Cl -, RN + (CH 3) 3 Cl -, diotadecyldimethylammonium chloride, cetyl pyridinium chloride, benzalkonium chloride, hexadecyl trimethylammonium chloride (CTAC) and hexadecyl trimethylammonium bromide (CTAB); and • non-ionic surfactants selected from polyol esters, polyoxyethylene esters, and poloxamers. • anionic surfactants selected from carboxylates; sulfates; sulfonates selected from docusates and alkyl benzene sulfonates; and phosphate esters; • cationic surfactants selected from RN + H 3 Cl -, RN + (CH 3) 3 Cl -, diotadecyldimethylammonium chloride, cetyl pyridinium chloride, benzalkonium chloride, hexadecyl trimethylammonium chloride (CTAC) and hexadecyl trimethylammonium bromide (CTAB); and • non-ionic surfactants selected from polyol esters, polyoxyethylene esters, and poloxamers.