According to a recent report by the American Physicist Network, Rice University researchers have invented a nanotube-based solid supercapacitor that is expected to combine the best properties of high-energy batteries and fast-charging capacitors in a device to fit the limits. The use of the environment, the relevant research results published in the Carbon Journal.

Electric double layer capacitors (EDLCs), commonly referred to as supercapacitors, have hundreds of times more energy than standard capacitors, as well as the ability to charge and discharge quickly. However, based on the tradition of liquid or gel electrolytes, EDLCs can fail under overheated or undercooled conditions. The supercapacitor developed by Rice team replaces the electrolyte with a solid nanoscale surface layer of an oxide dielectric, which avoids this problem.

The key to ultra-capacitor capacitors is to give electrons more habitat in their habitat, and nothing on Earth is more advantageous than carbon nanotubes in this area. When put into operation, the nanotubes self-assemble into dense, aligned structures. When converted into self-assembled supercapacitors, each nanotube bundle is 500 times longer than the width, and a small chip may have tens of millions. Nanobeams.

The Rice team first developed a large array of 50 micron arrays of nano-beam single-walled carbon nanotubes ranging from 15 nanometers to 20 nanometers for this new device, which in turn was converted into a copper electrode. The coating consists of gold and titanium, which helps to improve adhesion and electrical stability. In order to improve the conductivity, the nanotube bundle (original electrode) is doped with sulfuric acid, which is then coated with a layer of aluminum oxide (dielectric layer) and aluminum-doped zinc oxide by atomic layer deposition (ALD). Film of the electrode).

This type of energy storage device can be used in a wide range of applications, from nano-circuit chips to large power plants. Researcher Cary-Pinter said that no one has built this device with such a large aspect ratio material and ALD-like method. This supercapacitor can store charge under high frequency cycling and can be naturally integrated into the material. .

Rice lab chemist Robert Haug said the new supercapacitors are stable and scalable, and all energy storage solutions will be tightly integrated into many devices, including flexible displays and bio-implants. Objects, sensors and other electronic devices all benefit from fast charging and discharging.

(Reprinted from China Transmission Network)