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Paper Batteries

Paper Batteries

By coating paper with an ink that contains both carbon nanotubes and silver nanowire, the paper can store an electric charge, allowing it to function as a light and flexible battery or supercapacitor.

At Stanford, nanotubes + ink + paper = instant battery – [stanford.edu]

Stanford scientists are harnessing nanotechnology to quickly produce ultra-lightweight, bendable batteries and supercapacitors in the form of everyday paper.

Simply coating a sheet of paper with ink made of carbon nanotubes and silver nanowires makes a highly conductive storage device, said Yi Cui, assistant professor of materials science and engineering.

Batteries Made from Regular Paper – [technologyreview.com]

After paper is dipped in the nanotube ink and air-dried, it becomes highly conductive. The Stanford group tested the thin films as electrodes in supercapacitors and found that they could store more total energy, and operate at higher currents, than previous printed nanotube devices. Joel Schindall, professor of electrical engineering and computer science at MIT, says the paper supercapacitors store a surprisingly high amount of charge. The Stanford group also tested the paper electrodes as current collectors in lithium-ion batteries. Their performance matched that of the metal current collectors used in these batteries, even though the metal collectors are much heavier.

Highly conductive paper for energy-storage devices – [pnas.org]

Abstract
Paper, invented more than 2,000 years ago and widely used today in our everyday lives, is explored in this study as a platform for energy-storage devices by integration with 1D nanomaterials. Here, we show that commercially available paper can be made highly conductive with a sheet resistance as low as 1 ohm per square (Ω/sq) by using simple solution processes to achieve conformal coating of single-walled carbon nanotube (CNT) and silver nanowire films. Compared with plastics, paper substrates can dramatically improve film adhesion, greatly simplify the coating process, and significantly lower the cost. Supercapacitors based on CNT-conductive paper show excellent performance. When only CNT mass is considered, a specific capacitance of 200 F/g, a specific energy of 30–47 Watt-hour/kilogram (Wh/kg), a specific power of 200,000 W/kg, and a stable cycling life over 40,000 cycles are achieved. These values are much better than those of devices on other flat substrates, such as plastics. Even in a case in which the weight of all of the dead components is considered, a specific energy of 7.5 Wh/kg is achieved. In addition, this conductive paper can be used as an excellent lightweight current collector in lithium-ion batteries to replace the existing metallic counterparts. This work suggests that our conductive paper can be a highly scalable and low-cost solution for high-performance energy storage devices.

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