Patent ID: 9715970
Date: 2017-07-25
CPC Classifications: H01G,Y02E

Claim:
1. An ultracapacitor, comprising: a first current collector and a second current collector; a positive electrode electrically coupled to the first current collector; a negative electrode electrically coupled to the second current collector; a separator positioned between the positive electrode and the negative electrode; an electrolyte comprising a quaternary ammonium salt in ionic contact with the positive electrode and the negative electrode, wherein the electrolyte comprises less than 1M salt; and a housing component to retain the positive electrode, the negative electrode, the separator and the electrolyte, wherein the ultracapacitor is configured to operate between about 2.8 volts to about 3 volts, and wherein the ultracapacitor is further configured to operate at 65° C. with a cycle life of greater than 500k cycles.