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A High-Performance Structural Supercapacitor

Reece, Richard, Lekakou, Constantina and Smith, Paul A. (2020) A High-Performance Structural Supercapacitor ACS Applied Materials and Interfaces.

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Abstract

Considering the low specific capacitance of structural solid supercapacitors, which is due to the low ion diffusivity in solid electrolytes and the small specific surface area of some structural electrodes such as carbon fiber fabrics, novel structural supercapacitor designs are proposed and evaluated in this study based on supercapacitor-functional sandwich composite materials. Typical electrochemical double layer capacitors (EDLCs) are proposed with liquid organic electrolyte 1 M TEABF4 in PC (propylene carbonate). In the innovative sandwich structured composites, supercapacitors are embedded in the skins and integrated in the honeycomb core where the aluminium faces of the core constitute the current collectors of the supercapacitor-functional core. The sandwich composite material exhibited a flexural modulus of 5.07 GPa and a flexural strength of 413.9 MPa. The EDLCs embedded in the skins increased the skin flexural modulus and strength by 47% and 56%, respectively, for embedded lateral EDLCs, and by 91% and 106%, respectively, for embedded lateral and longitudinal EDLCs. Compared to typical EDLCs with the same electrolyte, the structural supercapacitors in this study demonstrated superior specific electrode capacitance, Csp,el = 153 F g-1 for the honeycomb supercapacitor and Csp,el = 95.7 F g-1 for the skin supercapacitor, translating to overall structural composite material performance of 0.68 Wh/m2honeycomb and 30.5 W/m2honeycomb for the supercapacitor-functional honeycomb, and 0.02 Wh/m2skin and 5.4 W/m2skin for the supercapacitor-functional skin.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Reece, Richard
Lekakou, ConstantinaC.Lekakou@surrey.ac.uk
Smith, Paul A.
Date : 14 May 2020
Funders : UK Defence Science Technology Laboratory
Grant Title : UK Defence Science Technology Laboratory PhD Studentship
Uncontrolled Keywords : structural supercapacitor; liquid electrolyte; composite sandwich structure; functional materials; power device
Depositing User : James Marshall
Date Deposited : 03 Jun 2020 08:53
Last Modified : 03 Jun 2020 08:53
URI: http://epubs.surrey.ac.uk/id/eprint/857045

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