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A spherical capacitor consists of two concentric conducting spherical shells of radii R1 (inner shell) and R2 (outer shell). The shells have  equal and opposite charges of +Q and −Q, respectively. For an isolated conducting spherical capacitor, the radius of the outer shell can be considered to be infinite.
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Coil-Type Asymmetric Supercapacitor Electrical Cables.

Zenan Yu1, Julian Moore1, Jean Calderon1

  • 1NanoScience Technology Center, Department of Chemistry, Department of Materials Science and Engineering, and College of Optics and Photonics (CREOL), University of Central Florida, FL, 32826, USA.

Small (Weinheim an Der Bergstrasse, Germany)
|August 20, 2015
PubMed
Summary

Researchers developed a novel coil-type asymmetric supercapacitor electrical cable (CASEC). This flexible energy storage device offers higher energy density and simultaneous power transmission, ideal for electronics and solar energy applications.

Keywords:
asymmetric supercapacitorselectrical cablesenergy storageflexiblesolid state

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Cable-shaped supercapacitors (SCs) are gaining attention for their flexibility, small size, and light weight.
  • Existing SCs typically feature symmetric designs, limiting their operational voltage and energy density.
  • Asymmetric designs offer potential for broader cell operation voltages and higher energy densities in SCs.

Purpose of the Study:

  • To report a novel coil-type asymmetric supercapacitor electrical cable (CASEC) with improved performance.
  • To investigate the mechanical-electrochemical stability of the developed CASEC.
  • To explore the dual functionality of energy storage and electricity transmission in CASECs.

Main Methods:

  • Fabrication of a novel coil-type asymmetric supercapacitor electrical cable (CASEC).
  • Electrochemical characterization including charge-discharge profiles and rate capability assessment.
  • Mechanical testing to evaluate flexibility, bendability, and cycle stability under various bending states.

Main Results:

  • The CASECs demonstrated excellent charge-discharge profiles and an extraordinary rate capability of 95.4%.
  • Achieved high energy density of 0.85 mWh cm(-3) with remarkable flexibility and bendability.
  • Superior bending cycle stability was observed, retaining approximately 93.0% after 4000 cycles under different bending states.
  • The CASECs successfully exhibited simultaneous and independent energy storage and electricity transmission capabilities.

Conclusions:

  • The developed coil-type asymmetric supercapacitor electrical cable (CASEC) offers enhanced cell operation voltage and superior mechanical-electrochemical stability.
  • CASECs present a promising integrated solution for energy storage and electrical conduction, suitable for diverse applications.
  • The technology holds significant potential for applications in areas such as solar energy storage and advanced electronic gadgets.