Tuesday, October 28, 2008

US Patent 7442284 - Polymer coated nanotube electrodes for rechargeable batteries


This patent from Boston College teaches fabricating a carbon nanotube substrate uniformly coated with conductive polymer material providing a high efficiency electrode for rechargeable batteries. Claim 1 reads:

1. An electrical energy storage device comprising:

a conductive carbon nanotube electrode material having a carbon nanotube substrate with a plurality of longitudinally aligned carbon nanotubules in a three-dimensional array; and

at least one electrically conducting organic or organo-metallic polymer surface coating on a surface of the plurality of nanotubules establishing electrical continuity by producing contact throughout the three-dimensional array and cohesively holding together the plurality of nanotubules in the three-dimensional array, wherein a charge-discharge rate for the carbon nanotube electrode material remains substantially independent of a film formation charge of the electrically conducting surface coating.