Helical Poly(isocyanide anthraquinones)-Based Cathodes for Long-Cycling Lithium Metal Batteries

Area of Science:

• Materials Science
• Polymer Chemistry
• Electrochemistry

Background:

• Helical polymers offer unique structural advantages for energy storage applications.
• Anthraquinone (AQ) derivatives are promising organic electrode materials for batteries.

Purpose of the Study:

• To design and synthesize novel helical poly(isocyanide anthraquinones) (PIC-AQs) for secondary battery electrodes.
• To evaluate the electrochemical performance and stability of these polymers, particularly PIC-2AQ, in lithium metal batteries (LMBs).

Main Methods:

• Living polymerization using a palladium catalyst (Pd-II) to synthesize PIC-AQ polymers.
• Characterization of polymer properties including molecular weight and dispersity.
• Electrochemical testing of PIC-2AQ in lithium metal batteries and assembly of an all-solid-state soft-pouch battery.

Main Results:

• High yields (approx. 90%) and controlled molecular weights were achieved for PIC-AQs.
• PIC-2AQ exhibited exceptional long-term stability in LMBs, retaining 141 mAh g⁻¹ after 2000 cycles.
• An all-solid-state soft-pouch battery using PIC-2AQ demonstrated stability under extreme conditions (bending, cutting).

Conclusions:

• Helical PIC-AQs are promising electrode materials for high-performance secondary batteries.
• PIC-2AQ shows excellent stability and potential for flexible organic lithium metal batteries.
• These findings broaden the application scope of organic batteries in flexible electronics.