Light-driven dry process of lithium-ion battery electrodes utilizing solid-liquid phase transitioning polymers.

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Chemistry

Background:

• Traditional lithium-ion battery electrode manufacturing often involves wet processing, which is energy-intensive and uses volatile organic solvents.
• Developing environmentally friendly and efficient electrode fabrication methods is crucial for advancing battery technology.

Purpose of the Study:

• To introduce a dry processing strategy for lithium-ion battery electrodes using photoliquefiable polymers.
• To demonstrate the dual functionality of azobenzene (Azo)-based polymers as temporary solvents and permanent binders.

Main Methods:

• Utilized azobenzene (Azo)-based polymers that exhibit photoliquefaction under UV irradiation.
• Incorporated Azo polymers into cathode composite materials, inducing temporary viscosity for processing.
• Removed UV light to allow Azo polymers to re-solidify at room temperature, acting as binders.

Main Results:

• Achieved a specific capacity of approximately 110 mAh g⁻¹ in the fabricated cathode.
• Demonstrated 77% capacity retention over 100 charge-discharge cycles.
• Enhanced mechanical properties of the electrodes due to the polymeric binder function of Azo polymers.

Conclusions:

• The photoliquefiable Azo polymer-based dry processing strategy offers an efficient and potentially greener alternative for lithium-ion battery electrode fabrication.
• This method successfully integrates temporary solvent behavior with permanent binder properties, leading to improved electrode performance and durability.