Tehnica de tricotat cu baterii de fire(Knitting electronics with yarn batteries)

La testare, bateria cu zinc-ion de fire a fost stabilă, a avut o capacitate mare de încărcare și a fost reîncărcabilă și impermeabilă. În plus, materialul ar putea fi tricotat și întins. De asemenea, ar putea fi tăiate în mai multe bucăți, fiecare dintre ele putând servi un ceas. Într-o demonstrație demonstrativă, opt bucăți din bateria de fire tăiate au fost țesute într-o piesă lungă care ar putea alimenta o centură care conține 100 de diode emițătoare de lumină (cunoscute ca LED-uri) și un panou electroluminiscent.

Posted: Mar 28, 2018

Knitting electronics with yarn batteries

(Nanowerk News) When someone thinks about knitting, they usually don’t conjure up an image of sweaters and scarves made of yarn that can power watches and lights. But that’s just what one group is reporting in ACS Nano („Waterproof and Tailorable Elastic Rechargeable Yarn Zinc Ion Batteries by a Cross-Linked Polyacrylamide Electrolyte”). They have developed a rechargeable yarn battery that is waterproof and flexible. It also can be cut into pieces and still work.
Knitting Electronics with Yarn Batteries
Pieces of flexible, rechargeable yarn batteries can be connected in series to power electroluminescent panel displays. (© ACS)
Most people are familiar with smartwatches, but for wearable electronics to progress, scientists will need to overcome the challenge of creating a device that is deformable, durable, versatile and wearable while still holding and maintaining a charge. One dimensional fiber or yarn has shown promise, since it is tiny, flexible and lightweight.
Previous studies have had some success combining one-dimensional fibers with flexible Zn-MnO2 batteries, but many of these lose charge capacity and are not rechargeable. So, Chunyi Zhi and colleagues wanted to develop a rechargeable yarn zinc-ion battery that would maintain its charge capacity, while being waterproof and flexible.
The group twisted carbon nanotube fibers into a yarn, then coated one piece of yarn with zinc to form an anode, and another with magnesium oxide to form a cathode. These two pieces were then twisted like a double helix and coated with a polyacrylamide electrolyte and encased in silicone.
Upon testing, the yarn zinc-ion battery was stable, had a high charge capacity and was rechargeable and waterproof. In addition, the material could be knitted and stretched. It also could be cut into several pieces, each of which could power a watch. In a proof-of-concept demonstration, eight pieces of the cut yarn battery were woven into a long piece that could power a belt containing 100 light emitting diodes (known as LEDs) and an electroluminescent panel.
Source: American Chemical Society