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Flexible and stretchable power sources for wearable electronics.

Alla M Zamarayeva1, Aminy E Ostfeld1, Michael Wang2

  • 1Department of Electrical Engineering and Computer Sciences, University of California Berkeley, 508 Cory Hall, Berkeley, CA 94720, USA.

Science Advances
|June 21, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed mechanically robust, intrinsically safe silver-zinc batteries for wearable electronics. These flexible and stretchable power sources utilize unique mechanical designs for enhanced durability and performance, enabling practical integration with devices like solar chargers.

Keywords:
Wearable power soursesflexible batteriesintegrated wearable power systemsstretchable batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Wearable Technology

Background:

  • Flexible and stretchable power sources are crucial for advancing wearable electronics.
  • Current challenges include achieving mechanical robustness, endurance, and safety in flexible batteries.
  • Existing technologies often compromise performance or safety for flexibility.

Purpose of the Study:

  • To develop mechanically robust and intrinsically safe flexible and stretchable silver-zinc batteries.
  • To demonstrate novel mechanical designs for enhanced battery endurance and compliance.
  • To integrate these batteries into functional wearable electronic systems.

Main Methods:

  • Utilized helical springs and serpentine structures as current collectors for mechanical support.
  • Fabricated wire-shaped batteries using helical band springs for flexural testing.
  • Designed serpentine-shaped batteries for tunable stretching capabilities.
  • Integrated batteries with a photovoltaic module for recharging demonstration.

Main Results:

  • Demonstrated silver-zinc batteries with exceptional mechanical robustness and intrinsic safety.
  • Achieved over 17,000 flexure cycles with minimal electrochemical performance degradation in wire-shaped batteries.
  • Showcased serpentine batteries with tunable stretchability and maintained specific capacity.
  • Successfully integrated batteries with a photovoltaic module for a functional wearable power system.

Conclusions:

  • The presented approach offers a viable solution for creating durable, safe, and flexible power sources for next-generation wearable devices.
  • Novel mechanical designs in current collectors are key to overcoming limitations in flexible battery technology.
  • The integration with photovoltaic modules highlights the potential for self-recharging wearable systems.