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Sci Adv. 2017 Jun 16;3(6):e1602051. doi: 10.1126/sciadv.1602051. eCollection 2017 Jun.

Flexible and stretchable power sources for wearable electronics.

Author information

1
Department of Electrical Engineering and Computer Sciences, University of California Berkeley, 508 Cory Hall, Berkeley, CA 94720, USA.
2
Mechanical and Aerospace Engineering, Andlinger Center for Energy and the Environment, Princeton University, D 428 Engineering Quadrangle, Princeton, NJ 08544, USA.

Abstract

Flexible and stretchable power sources represent a key technology for the realization of wearable electronics. Developing flexible and stretchable batteries with mechanical endurance that is on par with commercial standards and offer compliance while retaining safety remains a significant challenge. We present a unique approach that demonstrates mechanically robust, intrinsically safe silver-zinc batteries. This approach uses current collectors with enhanced mechanical design, such as helical springs and serpentines, as a structural support and backbone for all battery components. We show wire-shaped batteries based on helical band springs that are resilient to fatigue and retain electrochemical performance over 17,000 flexure cycles at a 0.5-cm bending radius. Serpentine-shaped batteries can be stretched with tunable degree and directionality while maintaining their specific capacity. Finally, the batteries are integrated, as a wearable device, with a photovoltaic module that enables recharging of the batteries.

KEYWORDS:

Wearable power sourses; flexible batteries; integrated wearable power systems; stretchable batteries

PMID:
28630897
PMCID:
PMC5473674
DOI:
10.1126/sciadv.1602051
[Indexed for MEDLINE]
Free PMC Article

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