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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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An Aqueous Ca-Ion Battery.

Saman Gheytani1, Yanliang Liang1, Feilong Wu2

  • 1Department of Electrical and Computer Engineering and Materials Science and Engineering Program University of Houston Houston TX 77204 USA.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|December 23, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces a safe, low-cost aqueous calcium-ion battery using a polyimide anode and copper hexacyanoferrate cathode. It demonstrates excellent stability and efficiency, overcoming limitations of other multivalent-ion batteries.

Keywords:
Ca‐ion batteriesaqueous‐based batteriescopper hexacyanoferratepolyimide

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Multivalent-ion batteries offer potential advantages over Li-ion batteries but face challenges with slow ion diffusion.
  • Calcium-ion (Ca-ion) chemistry presents a promising alternative due to its low polarization strength, similar to Li-ion.
  • Limited success in Ca-ion storage materials has hindered the development of functional Ca-ion batteries.

Purpose of the Study:

  • To demonstrate a safe, low-cost, and high-performance aqueous Ca-ion battery.
  • To identify suitable anode and cathode materials for efficient Ca-ion storage.
  • To investigate the Ca-ion storage mechanism and kinetics.

Main Methods:

  • Fabrication of a prototype aqueous Ca-ion battery using a polyimide anode and copper hexacyanoferrate cathode.
  • Electrochemical testing including cycling performance, capacity retention, and coulombic efficiency at various current rates (e.g., 10C).
  • Comparative analysis with a similar Mg-ion cell to highlight kinetic differences.

Main Results:

  • The prototype Ca-ion cell exhibited stable capacity and high efficiency.
  • Achieved 88% capacity retention and 99% average coulombic efficiency over 1000 cycles at 10C.
  • Demonstrated faster kinetics compared to Mg-ion systems, attributed to smaller ionic radii and easier desolvation of Ca-ions.

Conclusions:

  • A viable aqueous Ca-ion battery system has been successfully demonstrated.
  • The developed polyimide anode and copper hexacyanoferrate cathode show excellent performance and stability.
  • Ca-ion batteries offer significant kinetic advantages over other multivalent systems, paving the way for next-generation energy storage.