Improved pulse power sources with high-energy density capacitor

Lee, H.-L.; Bullard, G.L.; Mason, George E.; Kern, K.

doi:10.1109/20.22558

Cited by 12 publications

(3 citation statements)

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“…Such features allow EDLCs to bridge the gap between the performance of batteries, typically delivering low maximum specific power (<10 3 W kg −1 ), and the one of conventional capacitors, storing limited specific energy density (<0.1 Wh kg −1 ) . Consequently, EDLCs suit for several applications, including electric hybrid vehicles, pulse laser technologies, memory back‐up in electronic devices and communication systems, and burst‐mode power delivery . Furthermore, the fabrication of flexible electrodes with high areal capacitance (C areal ), i. e ., high energy density, is of paramount importance for applications with limited usable area, including portable wearable electronics (available space in the human body is ∼1.5 m 2 ) as well as micro‐electronics …”

Section: Introductionmentioning

confidence: 99%

“…[2,4,5] Consequently, EDLCs suit for several applications, including electric hybrid vehicles, pulse laser technologies, memory back-up in electronic devices [6] and communication systems, [7] and burst-mode power delivery. [5,[8][9][10][11][12][13] Furthermore, the fabrication of flexible electrodes with high areal capacitance (C areal ), i. e., high energy density, is of paramount importance for applications with limited usable area, including portable wearable electronics (available space in the human body is~1.5 m 2 ) [14][15][16][17][18][19][20] as well as micro-electronics. [21][22][23] In this context, nanostructured allotropes of carbon, including activated carbons (ACs) [24,25] carbide-derived carbon, [26,27] graphene, [28,29] carbon nanotubes (CNTs), [30][31][32] are intensively investigated as EDLC active materials.…”

Section: Introductionmentioning

confidence: 99%

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Flexible Graphene/Carbon Nanotube Electrochemical Double‐Layer Capacitors with Ultrahigh Areal Performance

et al. 2019

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The fabrication of electrochemical double‐layer capacitors (EDLCs) with high areal capacitance relies on the use of elevated mass loadings of highly porous active materials. Herein, we demonstrate a high‐throughput manufacturing of graphene/carbon nanotubes hybrid EDLCs. The wet‐jet milling (WJM) method is exploited to exfoliate the graphite into single‐few‐layer graphene flakes (WJM‐G) in industrial volumes (production rate ca. 0.5 kg/day). Commercial single‐/double‐walled carbon nanotubes (SDWCNTs) are mixed with graphene flakes in order to act as spacers between the flakes during their film formation. The WJM‐G/SDWCNTs films are obtained by one‐step vacuum filtration of the material dispersions, resulting in self‐standing, metal‐ and binder‐free flexible EDLC electrodes with high active material mass loadings up to around 30 mg cm−2. The corresponding symmetric WJM‐G/SDWCNTs EDLCs exhibit electrode energy densities of 539 μWh cm−2 at 1.3 mW cm−2 and operating power densities up to 532 mW cm−2 (outperforming most of the reported EDLC technologies). The EDCLs show excellent cycling stability and outstanding flexibility even in highly folded states (up to 180°).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flexible Graphene/Carbon Nanotube Electrochemical Double‐Layer Capacitors with Ultrahigh Areal Performance

et al. 2019

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“…Research on hybrid power sources [3]- [7] demonstrates that the combination of ultracapacitors and batteries achieves a longer run-time and a higher power capability compared to a battery-alone under a pulsed load condition. A major characteristic of the hybrid power sources described in these prior studies is the direct connection of the battery and ultracapacitor in parallel, as shown in Fig.…”

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confidence: 99%

Power Enhancement of an Actively Controlled Battery/Ultracapacitor Hybrid

Gao

Dougal

2005

IEEE Trans. Power Electron.

386

175

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Abstract-An actively controlled battery/ultracapacitor hybrid has broad applications in pulse-operated power systems. A converter is used to actively control the power flow from a battery, to couple the battery to an ultracapacitor for power enhancement, and to deliver the power to a load efficiently. The experimental and simulation results show that the hybrid can achieve much greater specific power while reducing battery current and its internal loss. A specific example of the hybrid built from two size 18650 lithium-ion cells and two 100-F ultracapacitors achieved a peak power of 132 W which is a three-times improvement in peak power compared to the passive hybrid power source (hybrid without a converter), and a seven times improvement as compared to the lithium-ion cells alone. The design presented here can be scaled to larger or smaller power capacities for a variety of applications.Index Terms-Hybrid power source, lithium-ion battery, peak power enhancement, power converter, ultracapacitor.

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History of Electrochemistry | Supercapacitors

Kurzweil

2025

Encyclopedia of Electrochemical Power Sources

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Improved pulse power sources with high-energy density capacitor

Cited by 12 publications

References 1 publication

Flexible Graphene/Carbon Nanotube Electrochemical Double‐Layer Capacitors with Ultrahigh Areal Performance

Flexible Graphene/Carbon Nanotube Electrochemical Double‐Layer Capacitors with Ultrahigh Areal Performance

Power Enhancement of an Actively Controlled Battery/Ultracapacitor Hybrid

History of Electrochemistry | Supercapacitors

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