This technology forms a self-healing hydrogel with a 3D network structure by creating imine bonds between a glycol chitosan backbone and oxidized sodium alginate side chains via a Schiff base reaction. Used as a silicon anode binder, it prevents silicon particle damage caused by volume expansion.
Silicon anodes have historically suffered from particle pulverization, electrical disconnection, delamination, and capacity degradation due to repeated volume expansion during charge and discharge cycles. Furthermore, conventional linear binders like PVdF have been limited in their ability to control physical stress or maintain strong adhesion to silicon particles.
This technology involves cross-linking glycol chitosan with 1–20 wt% oxidized sodium alginate (10–30 mol% oxidation) to create a 3D network hydrogel. Its self-healing properties, based on dynamic imine bonds, spontaneously repair damage from expansion, while strong interactions with silicon surface hydroxyl groups (-OH) maintain electrode mechanical stability and conductive networks. Synthesized at room temperature and neutral pH, it is suitable for mass-production anode processes and eco-friendly, seaweed-derived polymer electrode businesses, minimizing energy consumption and toxic solvent use.
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