A Novel Graphite-Graphite Dual Ion Battery Using an AlCl₃ -[EMIm]Cl Liquid Electrolyte

Area of Science:

• Electrochemistry
• Materials Science
• Energy Storage

Background:

• Development of advanced energy storage systems is crucial for renewable energy integration.
• Ionic liquid electrolytes offer high ionic conductivity and stability for battery applications.
• Graphite-based electrodes are explored for their cost-effectiveness and electrochemical properties.

Purpose of the Study:

• To develop and investigate a novel graphite-graphite dual ion battery (GGDIB).
• To explore the working principle, self-discharge, and pseudocapacitive behavior of the GGDIB.
• To evaluate the electrochemical performance, including rate and cycle stability, of the developed GGDIB.

Main Methods:

• Fabrication of a GGDIB using graphite paper as both anode and cathode.
• Electrolyte formulation using AlCl3/1-ethyl-3-methylimidazole Cl ([EMIm]Cl) room temperature ionic liquid.
• Electrochemical characterization including galvanostatic cycling, rate capability tests, and self-discharge analysis.

Main Results:

• The GGDIB operates via aluminum deposition/dissolution at the anode and chloroaluminate intercalation/deintercalation at the cathode.
• High ionic conductivity of the ionic liquid electrolyte contributes to excellent rate and cycle performance.
• Initial discharge capacity of 76.5 mA h g-1 at 200 mA g-1; 62.3 mA h g-1 retained after 1000 cycles at 500 mA g-1 (98.42% retention).

Conclusions:

• The developed GGDIB exhibits promising electrochemical performance and stability.
• The GGDIB offers a cost-effective and environmentally friendly alternative for future energy storage.
• Further research into ionic liquid-based dual ion batteries is warranted for practical applications.