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.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, LiMn2O4 (LMO) and LiNixCoyMn1-x-yO2 (NCM) cathodes have been developed for automotive and stationary power applications.
182 citations
TL;DR: In this paper, a thermomechanical actuator was fabricated using ferromagnetic material, which converted thermal energy into mechanical energy, which can be converted into electrical energy using piezoelectric materials.
Abstract: A unique concept for harvesting electrical energy from thermal energy is presented A thermomechanical actuator was fabricated using ferromagnetic material The device converts thermal energy into mechanical energy, which can be converted into electrical energy using piezoelectric materials Magnetic force and operating frequency were measured on the device Results show that the current power density at ΔT=50K is between 185 and 361mW∕cm2 A thermal finite element analysis model is also presented to understand the influence of thermal interface, suggesting that increases of 185mW∕cm2 or higher are achievable
181 citations
TL;DR: In this paper, a hybrid Li-ion capacitor with a bulk graphdiyne (GDY) anode and an activated carbon (AC) cathode was constructed, achieving an initial specific energy as high as 112.2 Wh−h−kg−1 at a power density of 400.
181 citations
TL;DR: In this article, a vibration-based electromagnetic energy harvester using a mechanical frequency up-conversion method for harvesting energy from external low-frequency vibrations within a range of 1-10 Hz was presented.
Abstract: This paper presents a new vibration-based electromagnetic energy harvester using a mechanical frequency up-conversion method for harvesting energy from external low-frequency vibrations within a range of 1-10 Hz. The structure consists of a magnet placed on a diaphragm, a polystyrene cantilever carrying a pick-up coil, and a mechanical barrier which converts low-frequency vibrations to a higher frequency, hence increasing the efficiency of the system. The tested structure proved to generate 88.6 mV and 544.7 μW rms power output by up-converting 10-Hz external vibration to 394 Hz. The obtained power density is 184 μW/cm3, with a device volume of 2.96 cm3. An analytical model is developed to analyze the behavior of the energy harvester prototypes with various dimensions. The model predicts the performance parameters of the structures within 5% error range. The effect of scaling down the device dimensions is investigated through the developed model and fabricated prototypes. It is shown that the power density of the energy harvester is increased as its dimensions are scaled down, proving that the proposed structure is a good candidate to be used in low-power wireless microsystems operating at low-frequency vibrations.
179 citations
TL;DR: In this article, a novel strategy for the synthesis of functional pillared graphene frameworks, in which graphene fragments in-between graphene sheets, through simple thermal-treatment of ozone (O3)-treated graphene oxide at very low temperature of 200 °C is reported.
Abstract: Supercapacitors, also known as electrochemical capacitors, can provide much faster charge–discharge, greater power density, and cyclability than batteries, but they are still limited by lower energy densities (or the amount of energy stored per unit volume). Here, a novel strategy for the synthesis of functional pillared graphene frameworks, in which graphene fragments in-between graphene sheets, through simple thermal-treatment of ozone (O3)-treated graphene oxide at very low temperature of 200 °C is reported. Due to its high packing density, high content of stable oxygen species, and continues ion transport network in-between graphene sheets, the functional pillared-graphene framework delivers not only high gravimetric capacitance (353 F g−1 based on the mass of the active material) and ultrahigh volumetric capacitance (400 F cm−3 based on total mass of electrode material) in aqueous electrolyte but also excellent cyclic stability with 104% of its initial capacitance retention after 10 000 cycles. Moreover, the assembled symmetric supercapacitor achieves as high as 27 Wh L−1 of volumetric energy density at a power density of 272 W L−1. This novel strategy holds great promise for future design of high volumetric capacitance supercapacitors.
178 citations