Scientists at the Massachusetts Institute of Technology think they're on the verge of making traditional batteries obsolete.
The researchers are working on a new device that uses carbon nanotubes to store and release electrical energy in a system that could carry as much power as today's lead or lithium batteries.
But unlike the rechargeable batteries used on today's cellphones and laptop computers, these devices could be recharged hundreds of thousands of times before wearing out.
And instead of taking hours to recharge, they could be powered up in about the same time it takes to fill up a gas tank.
Electronics professor Joel Schindall drives a Toyota hybrid car, which uses an electric battery to reduce gasoline consumption. But Schindall would prefer an all-electric car, and he thinks his team's research could finally make such vehicles practical.
In a basement laboratory at MIT, Schindall and his colleagues are using acetylene gas to deposit carbon nanotubes on pieces of silicon. Schindall says that the technology isn't much different from the kind used to produce microchips, and so mass production shouldn't be too difficult. Still, he said, `It's one thing to postulate it, but that's a long way from being commercially viable and competitive in price." Schindall says he hopes to have a finished example by the fall.
During the 1960s, scientists discovered that they could make more powerful capacitors by coating their electrodes with finely ground charcoal -- a form of carbon. The charcoal crystals greatly increased the surface area of each electrode, allowing it to collect a greater electrical charge.
Since then, scientists have learned how to grow carbon nanotubes -- extremely thin fibers of pure carbon. Schindall and his colleagues realized that millions of tiny nanotubes would do a much better job than ground charcoal in expanding an electrode's surface area. And if the nanotube-coated electrodes were made large enough, you could build a capacitor that could work like a battery with enough power to drive a device for hours.
(from The Boston Globe' June26)
***Thoughts
Ive heard these 'basement' promises before,
Remember Cold Fusion- 'Martin Fleischmann et al'
