AAWSAP DIRD, Ultracapacitors as Energy and Power Storage Devices, November 2010

Text

This text came with the file. It may have mistakes. When the text and the image disagree, the image is right.

UNCLASSIFIED11FOR. 8FFl@IAL tt.!! e"t I
leading alternative candidates for asymmetric ultracaps. Using a pseudocapacitive
design will most likely not be able to deliver the cycle life of a symmetric ultracap, but it
may be possible to achieve tens of thousands of cycles out of a battery-like electrode.
Better capacitance and higher operating voltage of the asymmetric electrode design
allow ultracapacitors to begin approaching batteries in terms of energy density.
Additional ultracapacitor improvements will come from materials and cell design. Cell
design factors include optimization and assembly techniques. Thinner electrodes and
current collectors will be one of the primary paths for better performance. Electrolytes
that provide cell voltages of at least 3 volts will be standard. Improvements such as
these will likely lead to improvements in commercially available ultracaps from 4 Wh/kg
to 5-6 Wh/kg. 21
UNCLASSIFIEO/;LFOA OFFI&il:.l.b YS& OrtLY
12