High-performance transparent and stretchable all-solid supercapacitors based on highly aligned carbon nanotube sheets

By using highly aligned carbon nanotube (CNT) sheets of excellent optical transmittance and mechanical stretchability as both the current collector and active electrode, high-performance transparent and stretchable all-solid supercapacitors with a good stability were developed. A transmittance up to 75% at the wavelength of 550 nm was achieved for a supercapacitor made from a cross-over assembly of two single-layer CNT sheets. The transparent supercapacitor has a specific capacitance of 7.3 F g(−1) and can be biaxially stretched up to 30% strain without any obvious change in electrochemical performance even over hundreds stretching cycles.