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Concentrated Electrolyte for High-Performance Ca-Ion Battery Based on Organic Anode and Graphite Cathode.

Jin Li1,2, Chengjun Han1,2, Xuewu Ou1

  • 1Advanced Energy Storage Technology Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China.

Angewandte Chemie (International Ed. in English)
|January 7, 2022
PubMed
Summary

Calcium-ion batteries offer promising energy storage but face stability challenges. This study introduces a novel concentrated electrolyte and electrode materials, significantly enhancing battery performance and cycling stability for practical applications.

Keywords:
Calcium-Ion BatteryCapacity RetentionConcentrated ElectrolyteGraphite CathodeOrganic Anode

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Calcium-ion batteries (CIBs) are attractive for energy storage due to calcium's abundance and properties.
  • Current CIB research is limited by poor cycling stability and capacity, primarily due to unsuitable electrolytes and electrode materials.

Purpose of the Study:

  • To develop advanced electrolytes and electrode materials for improved CIB performance.
  • To enhance the cycling stability and capacity of calcium-based dual-ion batteries (Ca-DIBs).

Main Methods:

  • Development of a 3.5 m concentrated electrolyte using calcium bis(fluorosulfonyl)imide (Ca(FSI)2) in carbonate solvents.
  • Utilizing a graphite cathode and an organic anode.
  • Assembly and testing of the Ca-based dual-ion battery (Ca-DIB).

Main Results:

  • The concentrated electrolyte improved anion intercalation in the graphite cathode and Ca2+ insertion in the organic anode.
  • The assembled Ca-DIB demonstrated a specific discharge capacity of 75.4 mAh g-1 at 100 mA g-1.
  • Achieved 84.7% capacity retention over 350 cycles, indicating enhanced cycling stability.

Conclusions:

  • The developed concentrated electrolyte and electrode combination significantly advances CIB technology.
  • This Ca-DIB system shows competitive performance, addressing key limitations in current CIB research.
  • The findings pave the way for more stable and efficient calcium-ion energy storage solutions.