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Tuesday, March 22, 2011

SUPERCAPACITORS




Huigang Zhang, Xindi Yu, Paul V. Braun (Materials Research Laboratory, and Beckman Institute, University of Illinois), have developed supercapacitors (device for storing electric charges), ultrafast, able to charge laptops in minutes and cell phones in seconds with the potential to be used in medical and military devices and also in electric vehicles. A storage technology that combines the performance of supercapacitors with the energy density of batteries. Until recently, ultra-fast loading and unloading caused dramatic reductions in the stored or delivered energy. The researchers were able to perform large uploads and downloads with minimal loss of capacity, using cathodes made of self-assembled three-dimensional bicontinuous nanoarchitectures composed of electrolytically active material sandwiched between the ways of transport of active ions and electrons. At temperatures of 400C and 1,000 C, lithium ion and nickel metal hydride batteries allow the production of lithium-ion battery capable of being loaded in 2 minutes.

SUPERCAPACITADORES

Huigang Zhang, Xindi Yu y Paul V. Braun (Materials Research Laboratory, and Beckman Institute, University of Illinois), han desarrollado supercapacitadores (almacenador de cargas eléctricas), ultrarápidos, capaces de cargar laptops en minutos y celulares en segundos con potencial a ser usados en dispositivos médicos, militares y en vehículos eléctricos. Una tecnología de almacenamiento que combina la performance de los supercapacitadores con la densidad de energía de las baterías. Hasta hace poco, las cargas y descargas ultrarápidas causaban dramáticas reducciones de la energía almacenada o liberada. Los investigadores lograron realizar grandes cargas y descargas con mínima pérdida de capacidad, empleando cátodos fabricados con nanoarquitectura bicontinua tridimensional autoensamblada, compuesta por material electroliticamente activo colocado en sandwich entre las vías de transporte de iones y electrones. A temperaturas de 400C y 1,000C, los iones de litio e hidruros de niquel permiten la fabricación de baterias de iones de litio capaces de ser cargadas en 2 minutos.

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