folded paper lithium ion battery increases energy density by 14 per cent oct 10 2013

Could the solution to the impending battery crunch be… origami? Scientists at Arizona State University have created a lithium-ion battery out of carbon nanotube-coated paper — and then, by folding it like a map, they have increased the battery’s energy density by 14 times.   We should probably start with the fact that this foldable lithium-ion battery is made out of paper.  . . . To create a paper-based battery, the scientists started with a KimWipe (a porous lint-free paper towel), coated it with polyvinylidene difluoride (PVDF) to improve adhesion of carbon nanotubes — and then dunked the PVDF-coated paper into a solution of carbon nanotubes (CNTs). Powders of lithium titanate oxide (LTO) and lithium cobalt oxide (LCO) — standard lithium battery electrodes — are sandwiched between two sheets of CNT-imbued paper. Thin foils of copper and aluminium placed above and below the sheets of paper complete the battery. . . . 

http://www.extremetech.com/extreme/168288-folded-paper-lithium-ion-battery-increases-energy-density-by-14-times