Method of making stretchable composite electrode

A method of making a stretchable composite electrode comprising:

• step (S1):
• providing an elastic substrate, and pre-stretching the elastic substrate along a first direction and a second direction, to obtain a pre-stretched elastic substrate;
• step (S2):
• laying a carbon nanotube active material composite layer on a surface of the pre-stretched elastic substrate, wherein step (S2)comprises:
• step (S21):
• laying a first carbon nanotube film structure on the surface of the pre-stretched elastic substrate, and the first carbon nanotube film structure directly contacting with the pre-stretched elastic substrate and comprising a first plurality of super-aligned carbon nanotube films stacked with each other, each of the first plurality of super-aligned carbon nanotube films comprising a plurality of carbon nanotubes substantially parallel with each other;
• step (S22):
• adding an electrode active material to a surface of the first carbon nanotube film structure away from the pre-stretched elastic substrate, to form a first active material layer on the surface of the first carbon nanotube film structure;
• step (S23):
• laying a second carbon nanotube film structure on a surface of the first active material layer away from the pre-elastic substrate and obtaining the carbon nanotube active material composite layer on the surface of the pre-stretched elastic substrate, and the second carbon nanotube film structure directly contacting with the surface of the first active material layer and comprises a second plurality of super-aligned carbon nanotube films stacked with each other;
• step (S3):
• removing the pre-stretching of the elastic substrate along the first direction and the second direction, to restore the pre-stretched elastic substrate to the elastic substrate and form a plurality of wrinkles on a surface of the carbon nanotube active material composite layer.