Charge storage devices containing carbon nanotube films as electrodes and charge collectors

An energy storage device, comprising:

• (a) a first electrode;
• (b) a second electrode;
• and
• (c) an electrolyte between the first and second electrodes;
• (d) wherein at least one said electrode comprises:
• an electrical contact;
• a first nanostructured network of a nanoscale electrically conducting material connected to the electrical contact;
• and
• a second nanostructured network of an electrochemically active material in contact with the first nanostructured network;
• (e) wherein said first nanostructured network comprises:
• a layer of a first electrically conducting material;
• and
• a layer of a second electrically conducting material in contact the layer of a first electrically conducting material;
• wherein said first and second electrically conducting materials have different densities.