Stable Poly(3,4-Dioxythiophene) Radical With Superior Electron and Ion Conductivity as High-Performance Anode for...

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Chemistry

Background:

• Organic radical batteries (ORBs) offer sustainable and cost-effective alternatives for lithium-ion batteries due to their diverse structures.
• Traditional doped 3,4-ethylenedioxythiophene (PEDOT) has been explored, but stable, non-doped radical polymers are sought after.

Purpose of the Study:

• To synthesize a novel, stable, non-doped organic radical polymer, poly(3,4-ethylenedioxythiophene)-3,4-dioxothiophene (PEDOT-TO2).
• To evaluate the electrochemical performance of PEDOT-TO2 as an anode material for lithium-ion batteries.
• To assess the potential of PEDOT-TO2 in full cells and its stability for energy storage applications.

Main Methods:

• One-step synthesis of the non-doped organic radical polymer PEDOT-TO2.
• Electrochemical evaluation of PEDOT-TO2 as an anode in Li-ion batteries, including capacity, rate capability, and cycle retention tests.
• Fabrication and testing of a LiFePO4//PEDOT-TO2 full cell.

Main Results:

• PEDOT-TO2 was successfully prepared with enhanced spin concentration.
• The material exhibited a high initial specific capacity of 340 mAh g⁻¹ at 0.1 A g⁻¹.
• Outstanding capacity retention (100% after 3500 cycles at 2.0 A g⁻¹) and high rate capability (159.6 mAh g⁻¹ at 10.0 A g⁻¹) were achieved.
• The LiFePO4//PEDOT-TO2 full cell demonstrated impressive rate performance and cycle stability.
• High air and electrochemical stability were observed for PEDOT-TO2.

Conclusions:

• PEDOT-TO2 is a promising, stable organic radical polymer for high-performance lithium-ion battery anodes.
• Its superior electrochemical properties and stability make it a valuable addition to organic electrode materials for energy storage.
• The material's performance surpasses many previously reported organic radical anodes, highlighting its potential impact.