Researchers at Rice University are using carbon nanotubes to
create rechargeable lithium-ion batteries that can be spray painted onto almost
any surface. The battery consists of spray painted layers where each layer
represents the different components in a traditional battery. The team demonstrates
their device in the video below using nine ceramic tiles coated with the paint
and connected to each other. When they were charged, the batteries powered a
set of LEDs for six hours, providing a steady 2.4 volts.