Topic
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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TL;DR: A flexible and wearable aqueous symmetrical lithium-ion battery is developed using a single LiVPO4 F material as both cathode and anode in a "water-in-salt" gel polymer electrolyte, due to the formation of a robust solid electrolyte interphase consisting of Li2 CO3 -LiF, which enables fast Li-ion transport.
Abstract: A flexible and wearable aqueous symmetrical lithium-ion battery is developed using a single LiVPO4 F material as both cathode and anode in a "water-in-salt" gel polymer electrolyte. The symmetric lithium-ion chemistry exhibits high energy and power density and long cycle life, due to the formation of a robust solid electrolyte interphase consisting of Li2 CO3 -LiF, which enables fast Li-ion transport. Energy densities of 141 Wh kg-1 , power densities of 20 600 W kg-1 , and output voltage of 2.4 V can be delivered during >4000 cycles, which is far superior to reported aqueous energy storage devices at the same power level. Moreover, the full cell shows unprecedented tolerance to mechanical stress such as bending and cutting, where it not only does not catastrophically fail, as most nonaqueous cells would, but also maintains cell performance and continues to operate in ambient environment, a unique feature apparently derived from the high stability of the "water-in-salt" gel polymer electrolyte.
168 citations
TL;DR: In this article, the authors used ternary nickel cobalt selenides as positive and negative electrodes for asymmetric supercapacitors with high energy and power densities.
168 citations
TL;DR: A thin-film three-dimensional SOFC architecture achieving a peak power density of 1.3 W/cm(2) obtained at 450 °C is reported, made possible by nanostructuring of the ultrathin (60 nm) electrolyte interposed with a nanogranular catalytic interlayer at the cathode/electrolyte interface.
Abstract: Obtaining high power density at low operating temperatures has been an ongoing challenge in solid oxide fuel cells (SOFC), which are efficient engines to generate electrical energy from fuels. Here we report successful demonstration of a thin-film three-dimensional (3-D) SOFC architecture achieving a peak power density of 1.3 W/cm2 obtained at 450 °C. This is made possible by nanostructuring of the ultrathin (60 nm) electrolyte interposed with a nanogranular catalytic interlayer at the cathode/electrolyte interface. We attribute the superior cell performance to significant reduction in both the ohmic and the polarization losses due to the combined effects of employing an ultrathin film electrolyte, enhancement of effective area by 3-D architecture, and superior catalytic activity by the ceria-based interlayer at the cathode. These insights will help design high-efficiency SOFCs that operate at low temperatures with power densities that are of practical significance.
168 citations
TL;DR: In this article, anion exchange membrane fuel cells (AEMFCs) have seen a significant growth in research and practical interest as the achievable current density, peak power density, and longevity of state...
Abstract: Recently, anion exchange membrane fuel cells (AEMFCs) have seen a significant growth in research and practical interest as the achievable current density, peak power density, and longevity of state...
166 citations
TL;DR: In this article, a flexible three-dimensional porous graphene foam-based supercapacitor (GFSC) was presented for energy storage applications, which exhibited excellent performance with areal capacitance (38 mF cm −2 ) about three times higher than the values reported for flexible carbon-based SCs.
165 citations