Battery Electrode PVdF Binder Composition for Crack-Free High-Rate Discharge

The invention utilizes a porous polymeric foam body as the core structure of the active material layer. This foam body provides a three-dimensional porous skeleton that maintains high void ratio even with increased active material density, ensuring sufficient electrolyte permeation and retention. The porous structure allows electrolyte to penetrate deep into the electrode, maintaining good charge/discharge cycle characteristics while achieving high energy density.

The invention creates a composite structure by combining the polymeric foam body with active material particles. The foam body serves as both the substrate and binding structure, eliminating the need for separate binders and conductive agents. This composite approach allows the active material to be densely packed while the foam matrix provides continuous porosity for electrolyte access, resolving the contradiction between density and electrolyte penetration.

The invention extracts and eliminates the binder component from the electrode structure. The polymeric foam body itself serves as the structural foundation, providing both mechanical support and binding function without requiring additional binder materials. This elimination of binders prevents the crack formation that occurs during drying processes, as the foam structure is inherently crack-resistant and does not undergo the same drying-induced stress.

The polymeric foam body performs multiple functions simultaneously: it serves as the substrate, binding agent, conductive network, and structural support. This self-sufficient structure eliminates the need for separate binder and conductive agent components, simplifying the electrode construction and preventing the interfacial delamination and cracking that plague conventional binder-based electrodes during manufacturing and cycling.