Flexible Electronic Components
Flexible, wearable electronics require equally flexible, wearable power sources. In the journal Angewandte Chemie, Chinese scientists have introduced an extraordinarily stretchable and compressible polyelectrolyte which, in combination with carbon nanotube composite paper electrodes, forms a supercapacitor that can be stretched or compressed while gaining, not losing capacity.
Supercapacitors bridge the gap between batteries, which are merely energy-storing devices, and normal capacitors, which release and take up electric energy very quickly but cannot store much energy. With their ability to store and release large amounts of electric power in a very short time, supercapacitors are preferably used in regenerative braking, as power buffers in wind turbines, and, increasingly, in consumer electronics such as laptop computers and digital cameras.
Stretchable Polyelectrolyte
To make supercapacitors fit for future electrics demands like, for example, wearables and paper electronics, Chunyi Zhi, City University of Hong Kong, and colleagues are searching for ways to endow them with mechanical flexibility. It can be achieved with a new electrolyte material: they developed a polyelectrolyte that can be stretched to more than ten times its length and compressed to half its thickness retaining full functionality, without breakage, cracking, or other damage to its material.
Electrolytes in supercapacitors are often based on polyvinyl alcohol gels. To make such gels mechanically more flexible, elastic components like rubber or fibers must be added. Zhi’s new electrolyte is based on a different principle: It is composed of a polyacrylamide (PAM) hydrogel reinforced with vinyl-functionalized silica nanoparticles (VSPNs). This material is both very stretchable thanks to the cross-links by the vinyl-silica nanoparticle and highly conductive thanks to the nature of the polyelectrolyte, which swells with water and both holds and transfers ions. “VSNPs cross-linkers serve as stress buffers to dissipate energy and homogenize the PAM network. These synergistic effects are responsible for the intrinsic super-stretchability and compressibility of our supercapacitor,” says Zhi.
Enhanced Performance
To assemble a working supercapacitor with this polyelectrolyte, two identical carbon nanotube composite paper electrodes were directly paved on each side of the pre-stretched polyelectrolyte film. Upon release, a wavy, accordion-like structure developed, showing surprising electrochemical behavior. “The electrochemical performance gets enhanced with the increase of strain,” the scientists found out.
And the strain was enormous: the supercapacitor sustained 1000 percent stretch and 50 percent compression at even higher or equal capacity. This flexibility makes this polyelectrolyte very attractive for new developments including wearable electronics.
- An Intrinsically Stretchable and Compressible Supercapacitor Containing a Polyacrylamide Hydrogel Electrolyte,
Yan Huang, Ming Zhong, Fukuan Shi, Xiaoying Liu, Zijie Tang, Yukun Wang, Yang Huang, Haoqing Hou, Xuming Xie, Chunyi Zhi,
Angew. Chem. Int. Ed. 2017.
DOI: 10.1002/anie.201705212
