Carbon-Based Fibrous EDLC Capacitors and Supercapacitors

Lekakou, Constantina; Moudam, O.; Markoulidis, Foivos; Andrews, T.; Watts, John F.; Reed, Graham T.

doi:10.1155/2011/409382

Cited by 62 publications

(58 citation statements)

References 26 publications

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“…Lekakou et al . used aligned CNT electrodes perpendicularly to the current collector and reported a power rating of 1.5 kW kg −1 . They pointed out that a typical C s of CNTs is from 15 to 80 F g −1 .…”

Section: Ecsmentioning

confidence: 99%

“…This implies device architectures, as well as type of electrode material, are crucial components of ECs that need careful designing. In addition, connecting N capacitors of capacitance (C) with a cell resistance (R), then the total capacitance (C) is given by equation :

normalC = \frac{C}{N} .

…”

Section: Tailoring Nanomaterials Properties Towards High Supercapacitancementioning

confidence: 99%

“…CNTs have been widely applied as an additive rather than being the main component [45] of EC devices. Lekakou et al [81] used aligned CNT electrodes perpendicularly to the current collector and reported a power rating of 1.5 kW kg À1 . They pointed out that a typical C s of CNTs is from 15 to 80 F g À1 [37].…”

Section: Carbon Nanotubesmentioning

confidence: 99%

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A review on the use of carbon nanostructured materials in electrochemical capacitors

Mombeshora

Nyamori

2015

Int. J. Energy Res.

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SUMMARYSustainable and renewable energy resources, as well as energy storage systems (ESSs), are amongst the current and critical global requirements. A comparative discussion on batteries, fuel cells and electrochemical capacitors (ECs) is presented. The mechanisms involved in various classes of ECs are also elaborated. Additionally, a historical background highlighting some of the major steps associated with EC development over the years is discussed in this review. In particular, carbon nanostructured materials have high potential in the development of ESSs, and hence this review presents an insight on the current ESSs with a strong bias towards these materials as ECs. The current status of carbon nanomaterials, such as carbon nanotubes, nanofibers, nano-onions, nanorods, fullerenes and graphene nanosheets, in ECs is reviewed. The associated effects of nanostructural parameters, such as pore sizes and specific electro-active areas, amongst others, in terms of energy storage capabilities are also discussed. Typical physicochemical characterisation techniques, which enrich understanding of their characteristics, are also reviewed. The discussion views set platforms for a variety of unique carbon nanomaterial designs with high prospective specific capacitance. Key porosity tailoring protocols, such as chemical activation, introduction of heteroatoms in carbon nanostructures and template synthesis methods, are also reviewed. The effects of other device components, such as electrolyte ion size and solvent system, electrode design and use of binders, to the overall capability of EC, are also discussed.

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Section: Ecsmentioning

confidence: 99%

normalC = \frac{C}{N} .

…”

Section: Tailoring Nanomaterials Properties Towards High Supercapacitancementioning

confidence: 99%

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A review on the use of carbon nanostructured materials in electrochemical capacitors

Mombeshora

Nyamori

2015

Int. J. Energy Res.

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“…Lekakou et al 7 fabricated potentially wearable supercapacitors using carbon nanotubes and hybrid carbon fiber as electrodes, glass microfiber and Supor poly separators, and a PEO based gel electrolyte. The supercapacitors made with hybrid carbon fiber electrodes and glass microfiber separator exhibited 0.08 F/cm 2 specific capacitance at a charging rate of 0.15V/s and 0.20 J/cm 2 energy per unit area at the same charging rate.…”

Section: Introductionmentioning

confidence: 99%

Electro-mechanical characterization of structural supercapacitors

et al. 2012

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The paper presents electrical and mechanical properties of structural supercapacitors and discusses limitations associated with the approach taken for the electrical properties evaluation. The structural supercapacitors characterized in this work had the electrodes made of carbon fiber weave, separator made of several cellulose based products, and the solid electrolyte made as PEGDGE based polymer blend. The reported electrical properties include capacitance and leakage resistance; the former was measured using cyclic voltammetry. Mechanical properties have been evaluated thorough tensile and three point bending tests performed on structural supercapacitor coupons.The results indicate that the separator material plays an important role on the electrical as well as mechanical properties of the structural capacitor, and that Celgard 3501 used as separator leads to most benefits for both mechanical and electrical properties. Specific capacitance and leakage resistance as high as 1.4kF/m 3 and 380kΩ, respectively, were achieved. Two types of solid polymer electrolytes were used in fabrication, with one leading to higher and more consistent leakage resistance values at the expense of a slight decrease in specific capacitance when compared to the other SPE formulation. The ultimate tensile strength and modulus of elasticity of the developed power storage composite were evaluated at 466MPa and 18.9MPa, respectively. These values are 58% and 69% of the tensile strength and modulus of elasticity values measured for a single layer composite material made with the same type of carbon fiber and with a West System 105 epoxy instead of solid polymer electrolyte.

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“…Among the optimized properties are specific capacitance, power density, energy density, and long operation cycles. Supercapacitors require electrodes with large surface area, which can be obtained by means of sets of carbon nanotubes operating as electrical conductive networks (Lekakou et al, 2011). These electrodes must be capable of supporting high power and energy density, with reduced internal electrical resistance and produced with lower cost.…”

mentioning

confidence: 99%