A 4 Farad high energy electrochemical double layer capacitor prototype operating at 3.2 V (IES prototype)

• Published in: Journal of power sources Vol. 326; pp. 162 - 169
• Main Authors: Varzi, A., Schütter, C., Krummacher, J., Raccichini, R., Wolff, C., Kim, G.-T., Rösler, S., Blumenröder, B., Schubert, T., Passerini, S., Balducci, A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.09.2016
• Subjects: Activated carbons; Electrochemical double layer capacitors; High voltage; Ionic liquids; Prototype; Electrochemical double layer capacitors; Ionic liquids; Prototype; High voltage; Activated carbons
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2016.06.123

In this manuscript we report about the realization and testing of a high-voltage electrochemical double layer capacitor (EDLC) prototype (IES prototype), which has been assembled using innovative electrode and electrolyte components. The IES prototype displays a nominal capacitance of 4 F, a maximum voltage of 3.2 V and its maximal energy and power are in the order of 37 Wh kg−1 and 65 kW kg−1, respectively. Furthermore, it also displays good cycling stability, high capacitance retention after 80 h float test and acceptable self-discharge. Taking into account substantial improvements of the cell design and assembly procedure, the performance of the IES prototype indicates that the components utilized in this device might be suitable alternatives to the state-of-the-art materials used in high energy EDLCs. •An innovative high energy EDLC prototype is reported as result of the IES project.•The prototype has nominal capacitance of 4 F and operative voltage of 3.2 V.•Maximum specific energy and power of 37 Wh kg−1 and 65 kW kg−1 are achieved.•Promising electrochemical stability is observed upon cycling and floating tests.•The IES components are suitable alternative to the state-of-the-art materials.