Hydrogen -Bonding and π-π Stacking Stabilized Two-Dimensional Organic Supramolecular Cathode for Lean-Aqueous...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Rechargeable zinc-ion batteries (RZIBs) are attractive for large-scale energy storage due to zinc's abundance and low cost.
• Current RZIBs are limited by aqueous electrolytes, leading to poor cathode performance and anode cycle life.

Purpose of the Study:

• To develop a novel organic cathode material for RZIBs.
• To enhance the cycle life and performance of zinc-organic batteries.

Main Methods:

• Synthesis and characterization of the organic cathode material benzo[i]benzo[6,7]quinoxalino[2,3-a]benzo[6,7]quinoxalino[2,3-c]phenazine-5,8,13,16,21,24-hexaone (TBQPH).
• Assembly and electrochemical testing of TBQPH||Zn batteries using an organic electrolyte.
• In-situ and ex-situ characterizations to understand the charge storage mechanism.

Main Results:

• TBQPH demonstrated a high reversible capacity of 205 mAh g^-1 at 0.1C due to a twelve-electron transfer mechanism.
• The TBQPH||Zn system achieved an exceptional cycle life of 7000 cycles.
• Characterization confirmed Zn²⁺ as charge carriers, reversibly interacting with C═N and C═O bonds in TBQPH.

Conclusions:

• TBQPH is a stable and high-performance organic cathode material for RZIBs.
• The study highlights the potential of organic materials and organic electrolytes in developing long-life batteries.
• This research offers insights into designing advanced organic cathode materials for energy storage applications.