Toward Multifunctional Binders for Sodium-Ion Batteries: Molecular Design Strategies and Material-Specific...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Binders are vital for electrode integrity and functionality in sodium-ion batteries (SIBs).
• Conventional binders struggle with high-capacity electrode materials prone to volume fluctuations and interface instability.
• Advanced binders are needed to overcome limitations of current SIB electrode designs.

Purpose of the Study:

• To systematically review the relationship between electrode material properties and advanced binder functionalities for SIBs.
• To translate electrode material failure mechanisms into specific design criteria for polymeric binders.
• To provide a comprehensive overview of molecular design strategies for multifunctional binders.

Main Methods:

• Delineation of primary failure mechanisms in cathode and anode materials.
• Identification of material-tailored design criteria for polymeric binders.
• Categorization of binder design strategies into four key domains: mechanical robustness, conductivity enhancement, interface stabilization, and electrode homogeneity.

Main Results:

• Failure mechanisms of various electrode materials were analyzed to inform binder design.
• Four key domains for advanced binder design were identified: adhesion, conductivity, interface stabilization (SEI/CEI), and homogeneity.
• Molecular design strategies for multifunctional binders were comprehensively reviewed.

Conclusions:

• Rational binder design is essential for overcoming challenges in high-capacity SIB electrodes.
• Multifunctional binders enhance mechanical robustness, conductivity, interface stability, and electrode homogeneity.
• Next-generation binders are critical for developing high-performance, durable SIBs for large-scale energy storage.