Batteries and battering "Buddha"s




A Tenfold Improvement in Battery Life?
By Alex Serpo, CNET News.com

http://tech.msn.com/news/articlecnet.aspx?cp-documentid=6030112
.........s
"It's not a small improvement," Cui said. "It's a revolutionary
development."

Citing a research paper they wrote, published in Nature
Nanotechnology, Cui said the increased battery capacity was made
possible though a new type of anode that utilizes silicon nanowires.
Traditional lithium ion batteries use graphite as the anode. This
limits the amount of lithium--which holds the charge--that can be held
in the anode, and it therefore limits battery life.

Silicon anodes have "the highest theoretical charge capacity"
according to Cui's paper, but they expand when charging and shrink
during use, a cycle that causes the silicon to be pulverized,
degrading the performance of the battery. For 30 years, this dead end
stumped researchers, who poured their battery-life-extending energy
into improving graphite-based anodes.

Cui and his colleagues looked at this old problem and overcame it by
constructing a new type of silicon nanowire anode. In Cui's anode, the
lithium is stored in a forest of tiny silicon nanowires, each with a
diameter that is a thousandth of the thickness of a sheet of paper.
The nanowires inflate to four times their normal size as they soak up
lithium, but unlike previous silicon anodes, they do not fracture.

Cui said there are few barriers to commercializing the technology.

"We are working on scaling up and evaluating the cost of our
technology," Cui said. "There are no roadblocks for either of these."

Cui has filed a patent on the technology and is considering formation
of a company or an agreement with a battery manufacturer. He expects
the battery to be commercialized and available within "several years,"
pending testing.











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