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Stanford Develops Lithium-Sulfur Battery With High Specific Energy

Researchers at Stanford University have developed an electrode that can be used to make more longer-lasting lithium-sulfur batteries.

In 2007, the same team led by materials science professor Yi Cui, developed silicon nanowire anode that could hold 10 times as much charge as conventional lithium-ion batteries.

By combining the new cathode with the previously developed silicon anode, the team created a battery with an initial discharge of 630 watt-hours per kilogram of active ingredients.

This represents an approximately 80 percent increase in the energy density over commercially available lithium-ion batteries, according to Stanford’s Cui, who was a coauthor of a paper describing the work published last month in Nano Letters.

The new battery combines a Li2S/mesoporous carbon composite cathode and a silicon nanowire anode.This new battery yields a theoretical specific energy of 1,550 Wh kg-1—four times that of the theoretical specific energy of existing lithium-ion batteries based on LiCoO2 cathodes and graphite anodes (~410 Wh kg-1). The team experimentally realized an initial discharge specific energy of 630 Wh kg-1 based on the mass of the active electrode materials.

This new technology is apparently safer, and it currently achieves 80 percent more capacity than lithium-ion batteries, but it’s nowhere near commercial launch with just 40 to 50 charge cycles.

To be competitive with lithium-ion batteries, the batteries developed at Stanford would have to operate for 300 to 500 charge cycles for consumer electronics applications and as many as 1,000 cycles for vehicle use.

Mar 15, 2010Blagojce Krivevski
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Blagojce Krivevski

Blagojce Krivevski is physicist and green technology lover. Keep in touch with Blagojce through his email, web site, Twitter, Linkedin, Facebook and Google+.

March 15, 2010 Technologybatteries, battery, lithium-ion batteries, lithium-sulfur batteries, Stanford, Technology
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