Design and performance of multifunctional structural composite capacitors

O’Brien, Daniel J.; Baechle, Daniel M.; Wetzel, Eric D.

doi:10.1177/0021998311412207

Cited by 96 publications

(94 citation statements)

References 55 publications

(57 reference statements)

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“…To this end O'Brien [6] has presented an approach to assess as to whether such materials would offer a weight saving: this paper culminates in such an analysis of the materials reported here.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, electrical and microstructural characterisation of multifunctional structural power composites

Greenhalgh

Ankersen

Asp³

et al. 2014

Journal of Composite Materials

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Multifunctional composites which can fulfil more than one role within a system have attracted considerable interest. This work focusses on structural supercapacitors which simultaneously carry mechanical load whilst storing/delivering electrical energy.Critical mechanical properties (in-plane shear and in-plane compression performance) of two monofunctional and four multifunctional materials were characterised, which gave an insight into the relationships between these properties, the microstructures and 2 fracture processes. The reinforcements included baseline T300 fabric, which was then either grafted or sized with carbon nanotubes, whilst the baseline matrix was MTM57, which was blended with ionic liquid and lithium salt (two concentrations) to imbue multifunctionality. The resulting composites exhibited a high degree of matrix heterogeneity, with the ionic liquid phase preferentially forming at the fibres, resulting in poor matrix dominated properties. However, fibre dominated properties were not depressed. Thus it was demonstrated that these materials can now offer weight savings over conventional monofunctional systems when under modest loading.

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Section: Introductionmentioning

confidence: 99%

Mechanical, electrical and microstructural characterisation of multifunctional structural power composites

Greenhalgh

Ankersen

Asp³

et al. 2014

Journal of Composite Materials

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show abstract

“…2a and 3a [15]. A range of processing conditions and laminate constructions, outlined in Table 1, were used in order to study their effects on capacitor performance.…”

Section: Methodsmentioning

confidence: 99%

“…The table also includes values for each set's volume-and mass-normalized energy densities calculated from for the 1st and 50th clearing events. Volume-normalized energy density is traditionally used to compare dielectric capacitors although, for achieving mass-savings via multifunctionality, the mass-normalized energy density is more relevant [15]. A small number of samples, approximately 12%, did not reach the 50th clearing event before failure.…”

Section: Testingmentioning

confidence: 99%

“…Despite this compromise, the multifunctional approach can lead to overall volume or mass savings because the same mass and volume elements are performing energy storage and mechanical functions simultaneously. The performance thresholds necessary to achieve mass or volume savings have been derived and expressed in terms of a minimum multifunctional performance metric [15].…”

Section: Introductionmentioning

confidence: 99%

“…Earlier contributions demonstrated the feasibility of achieving system-level weight [15] and volume [16] savings with a structural capacitor made from a continuous glass fiber reinforced epoxy dielectric, sandwiched between metallized polymer film electrodes (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

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Effect of processing conditions and electrode characteristics on the electrical properties of structural composite capacitors

O’Brien

Baechle

Yurchak

et al. 2015

Composites Part A: Applied Science and Manufacturing

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a b s t r a c tStructural capacitors are manufactured from glass fabric/epoxy prepreg dielectrics and metalized polymer film electrodes. The electrical breakdown strengths of these multifunctional materials are investigated across a wide range of electrode constructions and processing parameters. The results show that electrode selection and materials processing have a significant impact on the energy that the device can store. Also, this careful consideration of processing parameters and electrode construction has led to the development of a structural capacitor with an energy density exceeding 0.90 J/cm 3 , the highest yet reported.Published by Elsevier Ltd.

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Architected Tungsten Carbide Electrodes Using Origami Techniques

2019

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The fabrication of 3D complex shapes of porous tungsten carbide (WC) using an origami‐inspired manufacturing technology is presented. This is the first report of this technology for the fabrication of complex WC structures with density as low as 0.06 g cm−3. The porous WC origami structures are fabricated by heat treatment of folded paper infiltrated with an aqueous solution of ammonium metatungstate (AMT). WC purity up to 96% is achieved when using an AMT concentration of 20%, synthesis temperature of 1300 °C, and heating rate of 2.5 °C min−1. The as‐synthesized WC features a Brunauer–Emmett–Teller (BET) surface area of 102.06 m2 g−1. Beyond obtaining high‐purity WC, the focus is on understanding the effect of the microstructure on the mechanical performance of origami structures. Increasing the purity of WC decreases the elastic modulus and compressive strength of the origami structure, which is attributed to the increasing grain size of the crystalline phase materials and increase of graphitic phases in carbon with increasing temperature. Furthermore, the WC origami structures exhibit good and stable electrical conductivity under compressive stress. These initial results encourage further work on using paper as a scaffold to fabricate origami‐inspired multifunctional structures, for structural energy components.

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Design and performance of multifunctional structural composite capacitors

Cited by 96 publications

References 55 publications

Mechanical, electrical and microstructural characterisation of multifunctional structural power composites

Mechanical, electrical and microstructural characterisation of multifunctional structural power composites

Effect of processing conditions and electrode characteristics on the electrical properties of structural composite capacitors

Architected Tungsten Carbide Electrodes Using Origami Techniques

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