Patent 11756745 was granted and assigned to Fastcap Systems Corporation on September, 2023 by the United States Patent and Trademark Office.
A solid state polymer electrolyte is disclosed for use in an ultracapacitor. The electrolyte includes an ionic liquid and a polymer and may include other additives, wherein an ultracapacitor that utilizes the solid state electrolyte is configured to output electrical energy at temperatures between about −40° C. and about 250° C. or more.