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Power density

About: Power density is a research topic. Over the lifetime, 9534 publications have been published within this topic receiving 197264 citations. The topic is also known as: volumic power & volume power density.


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Journal ArticleDOI
TL;DR: In conjunction with environmentally benign ionic liquid electrolytes, vertically-aligned carbon nanotubes sheathed with and without a coaxial layer of vanadium oxide (V(2)O(5)) were used as both cathode and anode to develop high-performance and high-safety lithium-ion batteries.
Abstract: In conjunction with environmentally benign ionic liquid electrolytes, vertically-aligned carbon nanotubes (VA-CNTs) sheathed with and without a coaxial layer of vanadium oxide (V2O5) were used as both cathode and anode, respectively, to develop high-performance and high-safety lithium-ion batteries. The VA-CNT anode and V2O5–VA-CNT cathode showed a high capacity (600 mAh g−1 and 368 mAh g−1, respectively) with a high rate capability. This led to potential to achieve a high energy density (297 Wh kg−1) and power density (12 kW kg−1) for the prototype batteries to significantly outperform the current state-of-the-art Li-ion batteries.

69 citations

Journal ArticleDOI
TL;DR: The design and testing of a 10-kV SiC mosfet power module that switches at a record 250 V/ns without compromising the signal and ground integrity due to an integrated screen reduces the common-mode current by ten times and increases the partial discharge inception voltage by more than 50%.
Abstract: The advancement of silicon carbide (SiC) power devices with voltage ratings exceeding 10 kV is expected to revolutionize medium- and high-voltage systems. However, present power module packages are limiting the performance of these unique switches. The objective of this research is to push the boundaries of high-density, high-speed, 10-kV power module packaging. The proposed package addresses the well-known electromagnetic and thermal challenges, as well as the prominent electrostatic and electromagnetic interference (EMI) issues associated with high-speed, 10-kV devices. The high-speed switching and high voltage rating of these devices causes significant EMI and high electric fields. Existing power module packages are unable to address these challenges, resulting in detrimental EMI and partial discharge that limit the converter operation. This article presents the design and testing of a 10-kV SiC mosfet power module that switches at a record 250 V/ns without compromising the signal and ground integrity due to an integrated screen reduces the common-mode current by ten times. This screen connection simultaneously increases the partial discharge inception voltage by more than 50%. With the integrated cooling system, the power module prototype achieves a power density of 4 W/mm3.

69 citations

Proceedings ArticleDOI
TL;DR: In this article, the authors investigated the reliability of a single broad area diode laser diode with stripe widths in the 90-100 μm range and showed that it is possible to operate at 20W per emitter for over 4000 hours without failure, with 60μm stripe devices operating reliably at 10W per stripe.
Abstract: High power broad area diode lasers provide the optical energy for all high performance solid state and fiber laser systems. The maximum achievable power density from such systems is limited at source by the performance of the diode lasers. A crucial metric is the reliable continuous wave optical output power from a single broad area laser diode, typically for stripe widths in the 90-100 μm range, which is especially important for users relying on fibered multi-mode pumps. We present the results of a study investigating the reliable power limits of such 980nm sources. We find that 96μm stripe single emitters lasers at 20°C operate under continuous wave power of 20W per emitter for over 4000 hours (to date) without failure, with 60μm stripe devices operating reliably at 10W per stripe. Maximum power testing under 10Hz, 200μs QCW drive conditions shows that 96μm stripes reach 30W and 60μm stripes 21W per emitter, significantly above the reliable operation point. Results are also presented on step-stress-studies, where the current is step-wise increased until failure is observed, in order to clarify the remaining reliability limits. Finally, we detail the barriers to increased peak power and discuss how these can be overcome.

69 citations

Journal ArticleDOI
Ester Tee1, Indrek Tallo1, Heisi Kurig1, Thomas Thomberg1, Alar Jänes1, Enn Lust1 
TL;DR: In this paper, Nanostructured carbide-derived carbons (CDC) were synthesized from SiC powders (SiC-CDC) via gas phase chlorination within the temperature range from 1000°C to 1100°C.

69 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated semiconductor mineral (natural rutile) as a novel cathodic catalyst for microbial fuel cells (MFCs) under light irradiation, much higher than that of 7.64 W/m3 in the dark.
Abstract: This study investigated semiconductor mineral (natural rutile) as a novel cathodic catalyst for microbial fuel cells (MFCs). Under the experimental conditions, MFCs installed with a natural rutile-coated cathode produced a maximal power density of 12.03 W/m3 under light irradiation, much higher than that of 7.64 W/m3 in the dark. The open circuit voltage (VOCV) of the MFC was 519 mV when irradiated with visible light, the short-circuit photocurrent density (ISC) was 50.91 A/m3, and the fill factor (FF) was 45.44%. In a separate unoptimized MFC device with a switchable cathode, the maximum power density achieved with natural rutile and platinum (Pt) as a cathode catalyst was comparably at 2.7 and 3.6 W/m3, respectively. The low “incident monochromatic photon to current conversion efficiency” (IPCE) (0.13% at 420 nm) of rutile used in this study indicates a potential for further material and system improvement. Results from this study demonstrate that natural rutile, and other expected semiconductor materia...

69 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023652
20221,294
2021519
2020594
2019595
2018600