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EVLN: CCTO calcium-copper-titanate ‘super capacitors’

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EVLN: CCTO calcium-copper-titanate ‘super capacitors’

brucedp5


http://www.canindia.com/2014/01/a-faster-and-efficient-electronic-car-on-way/
A faster and efficient electronic car on way
January 19, 2014

Washington, Jan 19 (IANS) Your small electric car may soon become faster and more efficient thanks to ‘super capacitors’ that are capable of storing far greater charge in a much smaller package.

The energy storing devices can be made from a material called calcium-copper-titanate (CCTO) which, the researchers – including Indian-origin lead author Raghvendra Pandey – have identified as a practical energy-storage material.

“Efficient, high-speed, high-density energy storage is important to many fields, and super capacitors offer this,” said William Stapleton, an assistant professor of electrical engineering at the Texas State University (TSU).

“Fields such as ‘green’ energy and electric vehicles could benefit immediately from the use of these materials,” he added.

Pandey, professor of electrical engineering at TSU, and others showed that in CCTO, two properties of fundamental importance for the efficiency of a capacitor device are tightly linked.

The first property, called permittivity, is the physical property of the capacitor material that allows it to store energy – with higher permittivity values representing a better capacitor, said the study that appeared in the journal AIP Advances.

The second property, called loss tangent “has to do with how efficiently energy can be moved into and out of the capacitor, that is, how much is lost in the process to inefficiency”, Stapleton said.

“When the loss tangent is high,” explained Pandey, “the capacitor is ‘leaky’ and it cannot hold a stored charge for more than a few seconds.”

Pandey and his team have demonstrated that CCTO super capacitors should be capable of achieving high permittivity while maintaining low loss tangent, which would make them suitable for storing energy at the desired levels for many industrial applications.
[© canindia.com]



http://www.aip.org/publishing/journal-highlights/energy-storage-miniaturized-capacitors-may-boost-green-energy
Energy Storage in Miniaturized Capacitors May Boost Green Energy Technology
[Jan. 17, 2014]  By Jason Bardi  

[image  / R. K. Pandey/Texas State University
http://www.aip.org/sites/default/files/aippub/journal-highlights/images/SEM%20Micrograph%20of%20CCTO.jpg
SEM Micrograph of CCTO - The photograph shows clearly the large grains closely packed together and separated by well-defined grain boundaries. The density of the CCTO ceramic is 94 percent of the maximum theoretical density, indicating the superior nature of the samples.
]

Researchers Study the Properties of a Novel Material, Described in the Journal "AIP Advances," that Could Help Build High Heat-Tolerant Supercapacitors
From the Journal:
AIP Advances
For immediate release

WASHINGTON D.C. Jan. 17, 2014 -- The capacitors of electronic circuits function something like batteries – storing electrical charge that can be quickly dumped to power devices like camera flashes. So-called "supercapacitors" take the energy-storing abilities of capacitors a step further, storing a far greater charge in a much smaller package.

In a paper published in the journal AIP Advances researchers describe the possibility of fabricating a new class of high heat-tolerant electronics that would employ supercapacitors made from a material called calcium-copper-titanate, or CCTO, which the researchers have identified for the first time as a practical energy-storage material.

Devices using CCTO supercapacitors could compete with similar devices currently in use and could operate at much higher temperatures than standard silicon circuits, "more like the temperature in an engine," says William Stapleton, an assistant professor of electrical engineering at Texas State University (TSU) in San Marcos, Texas. CCTO had been identified as a promising supercapacitor material before, but its development for practical applications faced unexpected hurdles.

The lead author Raghvendra Pandey, Ingram Professor of electrical engineering at Texas State University, San Marcos, TX along with Stapleton and other collaborators, showed that in CCTO two properties of fundamental importance for the efficiency of a capacitor device are tightly linked. The first property, called permittivity, is the physical property of the capacitor material that allows it to store energy– with higher permittivity values representing a better capacitor.

The second property, called loss tangent "has to do with how efficiently energy can be moved into and out of the capacitor, that is, how much is lost in the process to inefficiency," Stapleton said.

"When the loss tangent is high," explain Pandey, "the capacitor is ‘leaky’ and it cannot hold a stored charge for more than a few seconds."

Researchers found that permittivity and loss tangent increased or decreased in tandem in CCTO. Efforts to simultaneously retain the high permittivity while minimizing the loss tangent might not succeed unless a new approach is taken for processing the material. While the work could help explain why researchers have had trouble producing ideal CCTO material in the past, Pandey and his research team have demonstrated that CCTO supercapacitors should be capable of achieving high permittivity while maintaining low loss tangent, which would make them suitable for storing energy at the desired levels for many industrial applications.

"Efficient, high-speed, high-density energy storage is important to many fields, and supercapacitors offer this," Stapleton said. "Fields such as ‘green’ energy and electric vehicles could benefit immediately from the use of these materials."

###
Article title:
Applications of CCTO supercapacitor in energy storage and electronics
Authors:
R. K. Pandey, W. A. Stapleton, J.Tate, A. K. Bandyopadhyay, I. Sutanto, S. Sprissler and S. Lin
Author affiliations:
Texas State University
About the journal:
AIP Advances

AIP Advances is a fully open access, online-only, peer-reviewed journal. It covers all areas of applied physical sciences. With its advanced web 2.0 functionality, the journal puts relevant content and discussion tools in the hands of the community to shape the direction of the physical sciences.
http://aipadvances.aip.org
[© 2013 AIP Publishing]



http://www.ummid.com/news/2014/January/19.01.2014/electronic-car.html
 A high-speed and efficient electronic car to hit markets soon
January 19, 2014  Washington: Your small electric car may soon become faster and more efficient thanks to 'super capacitors' that are capable of storing far greater charge in a much smaller package.
The energy storing devices can be made from a material called calcium-copper-titanate (CCTO) which, the researchers - including Indian-origin lead author Raghvendra Pandey - have identified as a practical energy-storage material ...




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