Reduction of porous carbon/Al contact resistance for an electric double-layer capacitor (EDLC)

Lei, Chunhong; Markoulidis, Foivos; Ashitaka, Z.; Lekakou, Constantina

doi:10.1016/j.electacta.2012.12.092

Cited by 203 publications

(134 citation statements)

References 23 publications

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“…On the surface of the foil is a thin carbon black-coated layer held by Al 4 C 3 nano whiskers [11]. The Al 4 C 3 nanometer scale whiskers were grown from underneath the Al oxide layer, and hence, they can not only provide electric conducting channels across the oxide layer, but also serve as mechanical lockers to hold carbon particles to the Al surface.…”

Section: Ac Cloth/toyal-carbo Electrodementioning

confidence: 99%

“…In order to reduce the carbon/Al contact resistance, a certain modification to the Al current collector is necessary, either through chemical change of Al surface, or introducing a conductive interlayer between the carbon cloth and the Al foil which binds the two components together. In this study, a modified Al foil, Toyal-Carbo Ò , with carbon black coated on the surface, was used for current collector, following our previous study [11]. Secondly, a conducting polymer, poly (3,4-ethylenedioxythiophene):polystyrene sulphonate (PED-OT:PSS), was used as a interlayer in this study.…”

Section: Introductionmentioning

confidence: 99%

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Phenolic carbon cloth-based electric double-layer capacitors with conductive interlayers and graphene coating

et al. 2015

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Phenolic resin-derived activated carbon (AC) cloths are used as electrodes for large-scale electric doublelayer capacitors or supercapacitors. To increase the energy and power density of the supercapacitor, the contact resistance between the carbon cloth and the aluminium foil current collector is reduced by modifying the Al current collectors. Different modified Al current collectors, including Toyal-Carbo Ò (surface-modified Al), DAG Ò (deflocculated Acheson TM graphite) coating and poly(3,4-ethylenedioxythiophene) (PEDOT) coating, have been tested and compared. The use of modified Al current collectors are shown to greatly reduce the contact resistance between the AC cloth and the Al foil. Another solution investigated in this study is to coat AC cloth with graphene through electrophoretic deposition (EPD). The graphene coated AC cloth is shown increased the capacitance and greatly reduced internal resistance.Graphical Abstract

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Section: Ac Cloth/toyal-carbo Electrodementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phenolic carbon cloth-based electric double-layer capacitors with conductive interlayers and graphene coating

et al. 2015

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“…6, ESR can be estimated for each EDLC from the intersection between the low frequency and more straight section of the Nyquist plot and the X-axis [35]. The height of the 3D printed layer is 0.6 mm for AC electrodes and generally showed a weak adhesive force between electrodes and current collector resulting in poor cycle stability and high ESR.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

A study of 3D printed flexible supercapacitors onto silicone rubber substrates

Areir

Harrison

et al. 2017

J Mater Sci: Mater Electron

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carbon-based materials have long been used as electrodes for EDLCs. Activated carbon (AC) is one of the most important commercial carbon materials being used as electrodes of EDLCs [2]. It is useful because of its high specific surface area, low-cost, an excellent synergy effect with additive materials and is easy to process. Recently, some attempts have been made to fabricate multiple material layers of the EDLC in one rapid and accurate deposition process [3]. Several fabrication processes have been used to fabricate flexible EDLCs and micro supercapacitors and reported in the literature including photolithography and an electrochemical deposition, a micro extrusion, coating, roll-to-roll printing, etc [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Compared to the method described here, other 3D printing methods are usually costly or not able to process all the materials necessary for making EDLCs, such as 3D selective laser melting machine [21]. 3D printing based on paste extrusion has been adopted for this study because it allows EDLCs to be fabricated in one single process including package sealing with various types of materials. In addition, EDLCs have been studied and manufactured by 3D direct-ink writing process, but the viscosity of the AC and silicone materials makes them unsuitable for this approach [22]. An important requirement of an EDLC nowadays is its ability to be highly flexible to meet the requirement for numerous applications. It is clear that some of these processes add little to the capacitance behaviour. Some need pre-treatment, e.g. the spray coating technique has a number of drawbacks like unevenness and a wide spread due to a high treatment temperature. The cost of fabrication is high and time-consuming when using the photolithography process. Limited electrode thicknesses and substrate are provided with the DVD burner process. Hence, these processes may not suit flexible EDLCs with a variety of material substrates, AC electrodes and gel electrolyte patterns and thicknesses. However, one of the major challenges of component Abstract The rapid development of flexible energy storage devices is crucial for various electronics industries. Highly flexible electrochemical double layer capacitors (EDLCs) can be manufactured by 3D printing technology. It was a great challenge to fabricate multiple material layers of the EDLC in one rapid and accurate deposition event. The fabricated structures were composed of twelve electrodes which could be configured in a number of different ways in one block module. This work aims to investigate the performance of the flexible EDLCs manufactured by 3D printing in a honeycomb pattern. The EDLC cells were fabricated using a slurry made from commercial activated carbon (AC) and a gel electrolyte deposited on a transparent silicone substrate. The flexible EDLCs structures can be used in flexible electronics with different patterns and sizes using 3D printer and can be applied to many applications such as wearable technology.

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“…In detail, micropores (<2 nm) enhance surface area and provide more active sites for adsorption of electrolyte, while mesopores (2-50 nm) improve penetration of electrolyte in the carbon structure for high power density. [33][34][35] In addition, macropores (>50 nm) are important to electrolyte transportation into the carbon electrode and ratio enhancement of electrode utilization. 36,37 Therefore, hierarchical porous carbon nanobers with micro-/mesopores are needed in SC electrode.…”

Section: -29mentioning

confidence: 99%

Electrospun three-layered polymer nanofiber-based porous carbon nanotubes for high-capacity energy storage

et al. 2017

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Recently, carbon nanomaterials are attractive for various applications owing to the benefits derived from their high electrical conductivity, chemical stability and large surface to volume ratio. However, the fabrication process of carbon nanomaterials is complicated and exhibits low productivity. Here we report the facile one-pot synthesis of highly porous 1D carbon nanotubes based on three-layered polymer nanofibers by using a dual-nozzle co-electrospinning technique to apply to an energy storage device.Specific capacitance (C G ) of the porous carbon nanotube-based electrode is 401 F g À1 , which is larger than that of the other carbon nanomaterials. Furthermore, the porous carbon nanotube exhibits excellent rate capability and cycle stability due to micro-/mesopores in the carbon structure enhancing the active surface area between carbon and the ions of the electrolytes. This unique fabrication technique is an effective approach for forming large scale highly porous carbon nanomaterials for diverse electrochemical applications.

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Reduction of porous carbon/Al contact resistance for an electric double-layer capacitor (EDLC)

Cited by 203 publications

References 23 publications

Phenolic carbon cloth-based electric double-layer capacitors with conductive interlayers and graphene coating

Phenolic carbon cloth-based electric double-layer capacitors with conductive interlayers and graphene coating

A study of 3D printed flexible supercapacitors onto silicone rubber substrates

Electrospun three-layered polymer nanofiber-based porous carbon nanotubes for high-capacity energy storage

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