Anode for Secondary Batteries Containing a Water-Soluble Binder and Manufacturing Method Thereof

Anode with Volume Expansion Controlled by Fibrin-Alginate Water-Soluble Binder

This technology is a water-soluble binder that combines the 3D network structure of fibrin protein with the stress-relaxation properties of alginate to effectively control the volume expansion that occurs during the charge and discharge cycles of high-capacity anode active materials like silicon.

While silicon anode active materials offer high storage capacity, they suffer from shortened cycle life due to significant volume changes during charge and discharge cycles, which lead to cracking within the electrode and the delamination of the active material.

This technology utilizes a water-soluble binder—created by mixing fibrin and alginate in a weight ratio of 1:5 to 5:1 to form an interpenetrating polymer network (IPN) or semi-IPN, and inducing ionic cross-linking through the addition of divalent or trivalent cations—to optimize the mechanical stiffness and stress-relaxation capabilities of the electrode. This approach is ideal for enhancing both the reliability and efficiency of secondary battery anode materials.

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Key Features:

• Anode comprising an anode active material, a conductive agent, and a water-soluble binder that binds the active material and conductive agent in a 3D structure, including fibrin.
• Configuration where the water-soluble binder includes at least one of fibrin, a fibrin-alginate complex, or a fibrin-alginate-cation complex.
• Configuration combining the 3D network structure of fibrin protein with the stress-relaxation capabilities of alginate.
• Anode containing a water-soluble binder that controls the volume expansion occurring during the charge and discharge of high-capacity anode active materials.

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