A New Tunnel-Type V4O9 Cathode for High Power Density Aqueous Zinc Ion Batteries

2021 ◽  
Author(s):  
Qiaoran Wang ◽  
Tianjiang Sun ◽  
Shibing Zheng ◽  
Lin Li ◽  
Tao Ma ◽  
...  
Keyword(s):  
Power Density ◽  
Vanadium Pentoxide ◽  
High Power ◽  
Room Temperature ◽  
Zinc Ion ◽  
High Power Density ◽  
Tunnel Structure

The mixed valences V4O9 with tunnel structure and room temperature metallic properties are prepared via partially reducing vanadium pentoxide. The unique tunnel structure and metallic characteristics are beneficial to the...

scholarly journals Aqueous Lithium--Air Batteries with High Power Density at Room Temperature under Air Atmosphere

2021 ◽  
Vol 03 (03) ◽  
pp. 1-1
Author(s):  
Hironari Minami ◽  
◽  
Hiroaki Izumi ◽  
Takumi Hasegawa ◽  
Fan Bai ◽  
...  
Keyword(s):  
Solid Electrolyte ◽  
Power Density ◽  
High Power ◽  
Room Temperature ◽  
Lithium Ion ◽  
High Power Density ◽  
Lithium Anode ◽  
Air Atmosphere ◽  
Air Battery ◽  
Lithium Air Batteries

Rechargeable batteries with higher energy and power density exceeding the performance of the currently available lithium-ion batteries are suitable for application as the power source in electric vehicles (EVs). Aqueous lithium-air batteries are candidates for various EV applications due to their high energy density of 1910 Wh kg-1. The present study reports a rechargeable aqueous lithium-air battery with high power density at room temperature. The battery cell comprised a lithium anode, a non-aqueous anode electrolyte, a water-stable lithium-ion-conducting NASICON type separator, an aqueous catholyte, and an air electrode. The non-aqueous electrolyte served as an interlayer between the lithium anode and the solid electrolyte because the solid electrolyte in contact with lithium was unstable. The mixed separator comprised a Kimwipe paper and a Celgard polypropylene membrane for the interlayer electrolyte, which was used for preventing the formation of lithium dendrites at a high current density. The proposed aqueous lithium-air battery was successfully cycled at 2 mA cm-2 for 6 h at room temperature under an air atmosphere.

Welding with high brilliance lasers and high power density

2010 ◽  
Author(s):  
Andreas Patschger ◽  
Markus Franz ◽  
Jens Bliedtner ◽  
Jean Pierre Bergmann
Keyword(s):  
Power Density ◽  
High Power ◽  
High Power Density

High power density of AlGaAs/InGaAs doped-channel FETs with low DC power supply

2001 ◽  
Vol 37 (9) ◽  
pp. 597
Author(s):  
H.C. Chiu ◽  
S.C. Yang ◽  
F.T. Chien ◽  
Y.J. Chan
Keyword(s):  
Power Density ◽  
High Power ◽  
Power Supply ◽  
High Power Density ◽  
Dc Power ◽  
Dc Power Supply

Investigation on Key Parameters of NI HTS Field Coils for High Power Density Synchronous Motors

2021 ◽  
Vol 31 (5) ◽  
pp. 1-5
Author(s):  
Uijong Bong ◽  
Chaemin Im ◽  
Jonghoon Yoon ◽  
Soobin An ◽  
Seok-Won Jung ◽  
...  
Keyword(s):  
Power Density ◽  
High Power ◽  
High Power Density ◽  
Synchronous Motors

scholarly journals Near-field thermophotovoltaics for efficient heat to electricity conversion at high power density

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Rohith Mittapally ◽  
Byungjun Lee ◽  
Linxiao Zhu ◽  
Amin Reihani ◽  
Ju Won Lim ◽  
...  
Keyword(s):  
Power Density ◽  
High Power ◽  
High Efficiency ◽  
Near Field ◽  
Electrical Power ◽  
Photovoltaic Cells ◽  
High Power Density ◽  
Pv Cell ◽  
Electrical Power Output ◽  
Power Densities

AbstractThermophotovoltaic approaches that take advantage of near-field evanescent modes are being actively explored due to their potential for high-power density and high-efficiency energy conversion. However, progress towards functional near-field thermophotovoltaic devices has been limited by challenges in creating thermally robust planar emitters and photovoltaic cells designed for near-field thermal radiation. Here, we demonstrate record power densities of ~5 kW/m2 at an efficiency of 6.8%, where the efficiency of the system is defined as the ratio of the electrical power output of the PV cell to the radiative heat transfer from the emitter to the PV cell. This was accomplished by developing novel emitter devices that can sustain temperatures as high as 1270 K and positioning them into the near-field (<100 nm) of custom-fabricated InGaAs-based thin film photovoltaic cells. In addition to demonstrating efficient heat-to-electricity conversion at high power density, we report the performance of thermophotovoltaic devices across a range of emitter temperatures (~800 K–1270 K) and gap sizes (70 nm–7 µm). The methods and insights achieved in this work represent a critical step towards understanding the fundamental principles of harvesting thermal energy in the near-field.

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