Stability enhancing additive for electrochemical devices

摘要

Embodiments described herein relate generally to electric double layer capacitors having an electrolyte formulation that includes a quantity of a stabilizing additive such that the electrochemical double layer capacitors retain cell capacitance for longer periods of time, generate less gas during operation, and experience less long term ESR. In some embodiments, an electrolyte formulation includes an ionic species, a solvent, and a stabilizer. In some embodiments the stabilizer contains a moiety that promotes adsorption to a surface, such as a carbon surface, and a moiety that promotes polarity of the stabilizer. In some embodiments, the solvent can be a nitrile compound and the stabilizer can be a compound of the formula I:;
Such that R is H, saturated or unsaturated, linear or branched, acyclic carbon group, OH, halogen NH2, NO2, S(O)2CF3, or monocyclic or polycyclic aryl, and n is an integer from 0 to 5.

主权项

1. An electrolyte formulation suitable for use in an energy storage device, said formulation comprising an ionic species, a solvent including a nitrile compound, and a stabilizer comprising a compound of formula I: wherein: R is H, a saturated or unsaturated, a linear or branched, acyclic carbon group, OH, a halogen, NH2, NO2, S(O)2CF3, or a monocyclic or polycyclic aryl, and n is an integer from 0 to 5.