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Researchers increase lifespan of lithium-sulfur batteries


April 4, 2013

The new batteries were developed at the Fraunhofer Institute for Material and Beam Technology IWS, Dresden

The new batteries were developed at the Fraunhofer Institute for Material and Beam Technology IWS, Dresden

Technology has advanced markedly since the dawn of the silicon age, but our portable gadgets and gizmos are still largely held back by the limitations of their power source. Scientists at the Fraunhofer Institute for Material and Beam Technology IWS in Dresden report progress in this regard, with the development of a new longer-lasting lithium-sulfur battery that has the potential to outperform lithium-ion batteries, at a lower cost.

Though more powerful and less expensive to produce than the more widely used lithium-ion batteries, lithium-sulfur batteries have typically sported a comparatively poor lifespan. However, the Dresden-based researchers have successfully developed a new design that increases the charge cycles of lithium-sulfur batteries by a factor of seven.

“During previous tests, the batteries scarcely crossed the 200-cycle mark,” said Dr. Holger Althues, head of the Chemical Surface Technology group at IWS. "By means of a special combination of anode and cathode material, we have now managed to extend the lifespan of lithium-sulfur button cells to 1,400 cycles."

The anode is made from a silicon-carbon compound instead of the metallic lithium usually used, offering improved stability as a result – a key factor in the performance and lifespan of a battery. The cathode, meanwhile, is composed of elemental sulfur, and as such is cheaper to produce than the cobalt cathodes typically implemented.

Looking ahead to the future, the IWS researchers expect to refine the lithium-sulfur batteries to the point where they reach an energy density of up to 600 watt-hours/kilogram (Wh/kg). This would beat the lithium-ion density record of 400 Wh/kg claimed last year by Envia, and more than double that of Li-ion batteries currently in use.

Beyond potential application in electric cars, the Fraunhofer researchers cite smartphones as an attractive candidate for lighter, cheaper and more powerful lithium-sulfur battery technology, and presumably most other portable electronic devices, too.

"Lithium-sulfur technology might even make electric flying a realistic possibility,” said Althues. “Although such progress is still a long way off.”

Source: Fraunhofer

About the Author
Adam Williams Adam scours the globe from his home in North Wales in order to bring the best of innovative architecture and sustainable design to the pages of Gizmag. Most of his spare time is spent dabbling in music, tinkering with old Macintosh computers and trying to keep his even older VW bus on the road. All articles by Adam Williams

There are already electric planes in existence; ones that can carry a person or two. :) Perhaps this new battery will make them more common place or extend the range?


In total agreement with BigWarpGuy

google "SOLAR IMPULSE" AND " all electric Long-EZ" Electric planes have been a reality for a long time now.

Ian Mitko

Envia's claims where a bit on the happy side. While they are good numbers, they actually cropped a chart that was showing competitors with equally promising developments to make themselves look better. And ever since, nothing has been seen from Envia at all: Too eager, too early, too irrelevant. But that's how all startups work: Drum like crazy, hire marketing people first. Nobody ever asks about production yields and repeatability when "great new results" are announced.

FHI is doing a bit of the same here, although I would tend to trust them a bit more since they usually do not desperately need to raise funds the very second they make the announcement.


Battery chemistry has come a long way and novel concepts are still being investigated at this very moment and continuously improved.

Much props to the people who made this possible.

Fretting Freddy the Ferret pressing the Fret

freddy, i wholeheartedly agree...

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