Dual-Network Topology Engineering via Dynamic Cross-Linking for Advanced Cathode Binders.

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Chemistry

Background:

• Binders are crucial for lithium-ion battery electrode integrity.
• Increasing regulations on fluorinated compounds necessitate nonfluorinated binder alternatives.

Purpose of the Study:

• To design and synthesize a novel fluorine-free copolymer binder.
• To investigate the binder's performance and stabilization mechanisms in lithium-ion batteries.

Main Methods:

• Multicomponent copolymerization to create a binder with carboxyl and sulfonate groups.
• Cross-linking strategy using thiourea or thiohydantoin to form a hydrogen-bond network.
• Electrochemical evaluation of binder performance in battery electrodes.

Main Results:

• The synthesized fluorine-free binder (AMIS) demonstrated excellent electrochemical performance.
• Electrodes with the C-AMIS binder retained 86.96% capacity over 200 cycles at 1 C.
• A rate capability of 61.90% was achieved at 5 C, attributed to a dual hydrogen-bond-covalent-bond network.

Conclusions:

• The dual bonding network effectively enhances interfacial stability and battery performance.
• This dynamic bonding strategy offers a promising approach for environmentally friendly, high-performance binders.
• The study provides a foundation for designing next-generation sustainable battery materials.