NANOFIBERS & MICROFIBERS: Spider Webs and Scaffolding
THE PROBLEM:
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In Dreamweaver's separators, the microfibers form a scaffolding over which the nanofiber "spider webs" drape, giving strength and dimensional stability as well as small pore size.
At higher magnification, it is clear the nanofibers form a barrier to dendrite growth and other cross contamination.
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Outstanding Separator Properties
Outstanding Thermal PerformanceDreamweaver separators combine microfibers that melt with nanofibers that do not melt, and are stable to 300 C. We then press them together to form a coherant network which is stable in even the most harsh conditions. The result is a separator with extraordinarily low shrinkage even above 300 C. See the comparison to conventional materials in the chart on the right.
The pictures (below right) show a conventional polyolefin separator and Dreamweaver Gold before and after 5 minutes at 150 C, and again after 5 minutes at 190 C. While the Gold separator is unchanged, the polypropylene separator shrinks dramatically at 150 C, and nearly disappears after 190 C. Can you find it in the picture? |
Small Pores, Narrow DistributionIn modern wet laid nonwoven manufacturing, as the water is drained from the slurry of fibers, the fibers are drawn to any areas of low density. This results in very uniform sheets with a naturally low pore size distribution. See the chart to the right, showing most pores at 0.4 microns with only 0.05 micron width of the peak at half the maximum value.
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Superior WettabilityWith a porosity as much as 10% higher, highly polar nanofibers, and an incredibly high surface area, the wet out of electrolyte is exceptional.
In a wicking test with different common solvents for lithium ion battery and supercapacitors, Dreamweaver separators averaged between 1.5 and 3 times the wick height. |
The Soteria architecture combines all of these advances with the Soteria Current Collectors. Visit Soteria to learn more.
Dreamweaver International
18-B Brozzini Court Greenville, SC 29615
18-B Brozzini Court Greenville, SC 29615