Yury Gogotsi‘s new work: 3D energy storage fabric

Textile-based energy storage devices can be used as a replacement for bulky and uncomfortable batteries in business smart clothing. Currently, fiber and yarn-based supercapacitors dominate , exhibiting superior performance at lengths below 4 cm, but longer lengths will be affected due to increased resistance. Computer aided design (CAD) weaving is a technology widely used in textile production and knitting energy storage. Because of the need for highly conductive wire electrodes that are several meters long, these devices have not been developed to a large extent to meet the high strength and flexibility requirements of CAD weaving. A number of solution-processable and highly conductive two-dimensional MXenes materials have been widely used in pastes, pastes, and electrode dyes in miniature supercapacitors on inks, paper, plastics and textiles.

Achievements

   Recently, Drexel  University ‘s Genevieve Dion professor and Yury Gogotsi professor in the internationally renowned journal Materials Today published entitled "3D knitted energy storage textiles using MXene -coated yarns" papers. Here, a new wearable energy storage architecture design , a three-dimensional knitted fabric supercapacitor, is designed to improve the performance of the long yarn electrode. The use of Ti 3 C 2 T x  MXene as the active material for the coating of commercial natural and synthetic yarns makes the production of knitted flat microcapacitors possible. The effects of woven structure and geometry on electrochemical performance were systematically studied to produce commercial energy storage textiles with higher energy and energy density. Under the condition of 2 mV s ^-1 , the prepared energy storage textiles have a capacitance of up to 707 mF cm ^-2 and  519 mF cm ^-2 , and a cycle stability of more than 10,000 times. This work is dedicated to MXeneA key step in the mass production of conductive yarns and three-dimensional knitted energy storage devices, and demonstrated the important role of knitted structures on device performance.

Figure  1  Preparation of MXene -based energy storage device fabric .

Figure  2 Performance of MXene coated yarn .  

Figure  3  Knitted topography .

Figure  4 Unit geometry . 

Figure  5 Unit structure .

Figure  6 Electrochemical performance of MXene coated cotton electrodes and nylon fiber electrodes . 

Figure  7 Test in PVA-H 3 PO 4 gel electrode .   

in conclusion

Other MXene- coated yarn electrodes further validate this new device structure. Synthetic fibers are often more difficult to load with more active substances than most natural fibers. By connecting the fiber / yarn electrodes together, knitting can be used to expand the fiber and yarn libraries used as wearable electrode materials and reduce the active substance content. As long as the virgin fiber / yarn meets the requirements for hydrophilicity and knitability , it is possible to use it as a substrate for MXene -based knitted electrodes.

Original link:

https://www.sciencedirect.com/science/article/abs/pii/S1369702120300419

Source: MXene Academic