Exploring Pillar[6]quinone as Cathode Material for Aqueous Zinc-Ion Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Quinone-based cathodes are promising for aqueous zinc-ion batteries (AZIBs) due to their performance and sustainability.
• Pillar[6]quinone (P6Q) is a novel quinone structure with potential for advanced battery applications.

Purpose of the Study:

• To investigate the potential of pillar[6]quinone (P6Q) as a cathode material for AZIBs.
• To evaluate the electrochemical performance and cycling stability of P6Q in AZIBs.

Main Methods:

• Electrochemical testing of P6Q as a cathode in AZIBs.
• Density functional theory (DFT) calculations.
• Ex-situ characterization using UV-Vis, XPS, and FTIR spectroscopy.

Main Results:

• P6Q demonstrated excellent electrochemical stability and long cycle life in AZIBs.
• The P6Q electrode achieved a discharge capacity of 118 mAh g^-1 with 83% retention after 10,000 cycles at 50C.
• The coordination mechanism between P6Q and Zn²⁺/H⁺ ions was elucidated.

Conclusions:

• P6Q is a highly stable and effective cathode material for AZIBs.
• The unique structure of P6Q enhances cycling stability.
• This study provides insights into the ion coordination mechanism for P6Q cathodes.