What the article doesn't say is whether this approach can be used to build larger batteries that would have higher power density than existing conventional large batteries. My guess is that the answer is Yes but it is not clear. Anyone know? Prototype devices are expected in 3 years:
All batteries consist of two electrodes, an anode and a cathode, and an electrolyte solution. UF researchers have created both nano-anodes and nano-cathodes, or anodes and cathodes measured on the scale of billionths of a meter. They've shown in tests that these electrodes are as much as 100 times more powerful than traditional ones.
The electrodes also have a unique and promising structure.
"The UF progress is very significant," said Bruce Dunn, a professor of materials science and engineering at the University of California-Los Angeles, the lead institution in the project. "(Martin's) work, the fabrication and testing of nano-dimensional cathodes and anodes, represents the key elements of his concentric tube battery approach, which represents a novel three-dimensional configuration."
Martin and his colleagues create the nano-electrodes using a technique he pioneered called template synthesis. This involves filling millions of tiny "nanoscopic" holes in a centimeter-sized plastic or ceramic template with a solution that contains the chemical components that make up the electrode. After the solution hardens, the researchers remove the template, leaving only the electrodes. The next challenge is to find a way to put together the nano-anode and nano-cathode with a nano-electrolyte and other components.
"We've proposed a totally new design for a battery where all the components are nanomaterials, and we have succeeded in making nearly all of these components," Martin said. "We have not yet developed the technologies to assemble these components, and that's what we're working on."
Robbie Sides, a UF doctoral student in chemistry and one of the researchers in Martin's lab, said UF's nano-anodes and nano-cathodes are not only more powerful than traditional ones, they're also hardier. Lithium-ion battery electrodes might sustain an average of 500 charges and discharges before wearing out, he said. In tests done by another UF chemistry doctoral student on Martin's team, the nano-electrodes sustained as many as 1,400 charges.
|Share |||Randall Parker, 2002 October 15 06:45 PM Nanotech Advances|