Conjugated Microporous Polymers with Tunable Electronic Structure for High-Performance Potassium-Ion Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Chemistry

Background:

• Conjugated microporous polymers (CMPs) offer potential for energy storage due to their porous nature and redox properties.
• The structure-performance relationships of CMPs in potassium-ion batteries (KIBs) remain underexplored.
• Developing advanced anode materials is crucial for high-performance KIBs.

Purpose of the Study:

• To engineer CMP anodes with tunable electronic structures for high-performance KIBs.
• To investigate the role of electronic structure in enhancing potassium storage capability.
• To establish structure-property correlations for CMP-based KIB anodes.

Main Methods:

• Synthesis of structure-engineered CMPs with controlled electronic properties.
• Electrochemical characterization of CMP anodes in KIBs.
• Analysis of electronic structure parameters like LUMO distribution, LUMO energy level, and band gap.

Main Results:

• The electronic structure of CMPs critically influences potassium storage capability.
• Optimized poly(pyrene-co-benzothiadiazole) (PyBT) exhibited a high reversible capacity of 428 mAh g^-1.
• The PyBT anode demonstrated excellent cycling stability over 500 cycles.

Conclusions:

• Fine-tuning the electronic structure of CMPs via synthetic control is key to enhancing KIB performance.
• The study provides fundamental insights into designing CMP anode materials for efficient potassium-organic energy storage.
• This work paves the way for next-generation CMP-based energy storage devices.