A non-aqueous electrolyte for an electric current producing electrochemical cell is provided comprising an ionically conductive salt and an additional ionically conducting salt in a non-aqueous medium, the additional ionically conducting salt corresponding to the formula M+(Z*(J*)j)−, wherein: M is a lithium atom, Z* is an anion group containing two or more Lewis basic sites and comprising less than 50 atoms not including hydrogen atoms, J* independently each occurrence is a Lewis acid coordinated to at least one Lewis basic site of Z*, and optionally two or more such J* groups may be joined together in a moiety having multiple Lewis acidic functionality, and j is an integer from 2 to 12. The addition of these ionically conducting salts to electrolyte solutions containing LiPF6 (and/or other lithium compounds) improves the stability of the electrolyte solution.