Stability enhancing additive for electrochemical devices
US9536678B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2014 |
| Grant date | Jan 3, 2017 |
| Priority date | — |
| Expiry date | Sep 25, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/70
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.