Aliphatic Polycarbonate-Based Binders for High-Loading Cathodes by Solvent-Free Method Used in High Performance...

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Chemistry

Background:

• Binder selection is critical for lithium-ion battery performance despite low ratios.
• Current binders present challenges in electrode fabrication and environmental impact.

Purpose of the Study:

• To investigate polycarbonate-based polymers as novel binders for lithium-ion batteries.
• To evaluate the performance and sustainability of dry electrodes prepared with these binders.

Main Methods:

• Synthesis of polycarbonate-based polymers with specific structural features.
• Fabrication of dry lithium iron phosphate (LiFePO4) electrodes using a solvent-free method.
• Electrochemical testing of battery cells incorporating the novel binders.

Main Results:

• Polycarbonate binders exhibit high tensile and bonding strength.
• Rich polar carbonate groups enhance ionic conductivity.
• Poly (propylene carbonate)-plus (PPC-P) binder resulted in long cycle life (350 cycles at 1 C, 89% capacity retention).
• Solvent-free electrode preparation reduces cost and utilizes industrial waste gas (CO2).
• Binder facilitates simple thermal recycling of battery materials.

Conclusions:

• Polycarbonate-based polymers are promising binders for sustainable and high-performance lithium-ion batteries.
• The solvent-free fabrication method offers significant advantages for industrialization.
• This approach provides a pathway for cost-effective and eco-friendly battery production and recycling.