Energy harvesting textiles for a rainy day: woven piezoelectrics based on melt-spun PVDF microfibres with a conducting core
Journal article, 2018

Recent advances in ubiquitous low-power electronics call for the development of light-weight and flexible energy sources. The textile format is highly attractive for unobtrusive harvesting of energy from e.g., biomechanical movements. Here, we report the manufacture and characterisation of fully textile piezoelectric generators that can operate under wet conditions. We use a weaving loom to realise textile bands with yarns of melt-spun piezoelectric microfibres, that consist of a conducting core surrounded by β-phase poly(vinylidene fluoride) (PVDF), in the warp direction. The core-sheath constitution of the piezoelectric microfibres results in a—for electronic textiles—unique architecture. The inner electrode is fully shielded from the outer electrode (made up of conducting yarns that are integrated in the weft direction) which prevents shorting under wet conditions. As a result, and in contrast to other energy harvesting textiles, we are able to demonstrate piezoelectric fabrics that do not only continue to function when in contact with water, but show enhanced performance. The piezoelectric bands generate an output of several volts at strains below one percent. We show that integration into the shoulder strap of a laptop case permits the continuous generation of four microwatts of power during a brisk walk. This promising performance, combined with the fact that our solution uses scalable materials and well-established industrial manufacturing methods, opens up the possibility to develop wearable electronics that are powered by piezoelectric textiles.

piezoelectric

Author

Anja Lund

University of Borås

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Karin Rundqvist

University of Borås

Erik Nilsson

Swerea

Liyang Yu

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Christian Müller Group

Bengt Hagström

Chalmers, Industrial and Materials Science, Engineering Materials

Swerea

Christian Müller

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Christian Müller Group

npj Flexible Electronics

Vol. 2 9

Subject Categories

Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1038/s41528-018-0022-4

More information

Latest update

9/15/2020