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Flexible carbon fiber based structural supercapacitor composites with solvate ionic liquid-epoxy solid electrolyte
journal contribution
posted on 2023-02-06, 01:29 authored by B Dharmasiri, Filip Stojcevski, Ken Aldren UsmanKen Aldren Usman, Alex QinAlex Qin, Joselito RazalJoselito Razal, Egan DoevenEgan Doeven, Paul FrancisPaul Francis, Tim ConnellTim Connell, Y Yin, GG Andersson, Ameya Anil Borkar, Luke HendersonLuke HendersonThe “mass-less” energy storage technology based on the concept of multifunctional structural energy storage composites has the potential to revolutionize the design and performance of electric vehicles in the future. This work presents the fabrication process and properties of a structural supercapacitor laminate made of surface functionalized carbon fiber (CF), glass fiber separator and an epoxy-solvate ionic liquid bi-continuous electrolyte. CF surface has been electrochemically functionalized with a covalently grafted layer of redox-active poly(o-phenylenediamine) significantly improving the pseudocapcitance. The bi-continuous electrolyte contains 70% (w/w) lithium-triethylene glycol dimethyl ether bis(trifluoromethanesulfonyl)imide [Li-G3]TFSI in RIM935/RIMH936 epoxy resin. This fabricated supercapacitor device demonstrated a specific capacitance of 909 mF/g at 0.5 mA g−1, a 45-fold improvement compared to a device made with unfunctionalized CF. The device showed a maximum energy density of 181.79 mW h kg−1 at 0.5 mA g−1 and power density of 6.18 W kg−1 at 2.5 mA g−1, while maintaining excellent thermal stability, and possesses a multifunctional index of 1.01. They also possess a capacitance retention of 77.4% and coulombic efficiency of 90.9% after 10 000 charge–discharge cycles. Most notably, we show that the capacitance of the composite can be improved simply by bending the device at different angles, effecting a 3-fold increase when bent at 90° and 135°. This is the first time that the geometry of a composite has been shown to influence the electrochemical performance of a capacitor device and opens new avenues of investigation into structural energy optimization.
History
Journal
Chemical Engineering JournalVolume
455Article number
140778Pagination
1-13Location
Amsterdam, The NetherlandsPublisher DOI
ISSN
1385-8947eISSN
1873-3212Language
EnglishPublication classification
C1 Refereed article in a scholarly journalIssue
Part 2Publisher
ElsevierUsage metrics
Categories
Keywords
?Mass-less ? energy storageCarbon fiber surface functionalizationCHALLENGESCHEMICAL ACTIVATIONDESIGNEngineeringEngineering, ChemicalEngineering, EnvironmentalENHANCEEpoxy-ionic liquid bi-continuous electrolyteFlexible structural supercapacitorsHYBRIDPAPERPERFORMANCEPOLYANILINEScience & TechnologyTechnology7 Affordable and Clean EnergySchool of Life and Environmental SciencesInstitute for Frontier MaterialsFaculty of Science Engineering and Built EnvironmentEnvironmental Engineering not elsewhere classifiedChemical Engineering not elsewhere classifiedCivil Engineering not elsewhere classified
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