Bio-Based Polyhydroxyanthraquinones as High-Voltage Organic Electrode Materials for Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Sustainable Energy

Background:

• Organic electrode materials (OEMs) offer sustainable alternatives for batteries.
• Bio-based OEMs are desirable due to resource availability and environmental benefits.
• A gap exists in bio-based OEMs suitable for high-voltage battery applications.

Purpose of the Study:

• To synthesize novel bio-based polyhydroxyanthraquinones (PHAQs) and their redox polymers.
• To evaluate these materials as cathode components in high-voltage lithium metal batteries.
• To improve the electrochemical stability and performance of bio-based OEMs.

Main Methods:

• Synthesis of PHAQs (OHAQ, HHAQ, THAQ) from plant precursors.
• Polymerization of PHAQs using formaldehyde, glyoxal, or glutaraldehyde linkers.
• Electrochemical testing of PHAQ-polymer composites as cathode materials in lithium metal cells, including cycling stability and capacity measurements.

Main Results:

• Synthesized PHAQs exhibit high redox potentials (3.5-4.0 V vs Li/Li+) and initial capacities up to 381 mAh g-1.
• Polymerization successfully mitigated dissolution issues, enhancing cycling stability.
• Poly(THAQ-formaldehyde)-MWCNT and poly(HHAQ-formaldehyde)-MWCNT composites showed stable high-voltage discharge (starting at 4.0 V vs Li/Li+) and retained significant capacity after 100 cycles.

Conclusions:

• Bio-based PHAQs and their polymers are viable candidates for high-voltage battery cathodes.
• Polymerization is an effective strategy to improve the durability of organic electrode materials.
• This work contributes to the development of sustainable and high-performance energy storage solutions.