Hybrid ribbons a gift for powerful batteries

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Hybrid ribbons a gift for batteries

Rice lab finds oxide/graphene material works for lithium-ion storage

HOUSTON 25, 2013) Hybrid ribbons oxide  (VO2) and graphene accelerate the development of high-power batteries suitable for electric and other demanding applications.

The University lab of materials scientist Ajayan determined that material  is a superior cathode for that could supply high energy density and power density. The research online this month in the Chemical Society journal Nano .

The ribbons created at Rice are of times thinner than a of paper, yet have potential far outweighs current materials for ability to charge and discharge quickly. Cathodes built half-cells for testing at Rice charged and discharged in 20 seconds and more than 90 percent of initial capacity after than 1,000 cycles.

“This is the direction battery is going, not only for something high energy density but high power density,” said. “It’s somewhere a battery and a supercapacitor .”

The ribbons have the advantage of using abundant and cheap materials. is done through a very hydrothermal process, and I think it be easily scalable to large he said.

Ajayan said oxide has long been a material with great and in fact vanadium pentoxide has used in lithium-ion batteries for its structure and high capacity. But are slow to charge and discharge, due to low electrical conductivity. The high-conductivity lattice that is literally in solves that problem he said, by serving as a speedy for electrons and channels for ions.

The atom-thin graphene sheets to the crystals take up very bulk. In the best samples at Rice, fully 84 percent of the weight was the lithium-slurping VO2, held 204 milliamp hours of per gram. The researchers, led by Rice student Yongji Gong and author Shubin Yang, they believe that to be the best overall performance seen for lithium-ion battery

“One challenge to production was the conditions for the co-synthesis of VO2 ribbons graphene,” Yang said. The involved suspending graphene nanosheets with powdered pentoxide (layered vanadium with two atoms of vanadium and of oxygen) in water and heating it in an for hours. The vanadium pentoxide was reduced to VO2, which into ribbons, while the oxide was reduced to graphene, said.

The ribbons, with a coating of graphene, were about 10 nanometers thick, up to 600 wide and tens of micrometers in

“These ribbons were the blocks of the three-dimensional architecture,” said. “This unique was favorable for the ultrafast diffusion of lithium ions and electrons charge and discharge processes. It was the key to the of excellent electrochemical performance.”

In testing the new material, Yang and found its capacity for lithium remained stable after 200 even at high temperatures degrees Fahrenheit) at which cathodes commonly decay, at low charge-discharge rates.

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“We think is real progress in the development of materials for high-power lithium-ion Ajayan said, suggesting the ability to be dispersed in a solvent make them suitable as a in the paintable batteries  developed in his

Co-authors of the new paper are Rice students Daniel Hashim and Ma; research scientist Zheng former Rice visiting Liang Zhan, now an associate at East China University of and Technology in Shanghai; and faculty Robert Vajtai. Ajayan is the M. and Mary Greenwood Anderson in Engineering and a professor of mechanical and materials science, chemistry, and and biomolecular engineering.

The work was by the U.S. Army Research and the Office of Naval Research a Multidisciplinary University Research grant and a National Science Graduate Research Fellowship

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Ajayan Group: http://www.owlnet.rice.edu/

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