초록 ▼

The present disclosure is directed to an improved fibrillated matrix-type active layer for an electrode of improved strength and durability and capable of operation at high current density with enhanced resistance to mechanical failure, and to a process for producing such improved active layers. The

The present disclosure is directed to an improved fibrillated matrix-type active layer for an electrode of improved strength and durability and capable of operation at high current density with enhanced resistance to mechanical failure, and to a process for producing such improved active layers. The process is characterized by alternately or simultaneously producing two components; combining the components; shear blending (fibrillating) the mixture; drying; chopping to a fine powder form, and rolling into a self-sustaining, coherent shear form. Alternatively, the active layer can be formed by wet deposition of the powder on a filter paper or like medium. The term “matrix”as used herein means that the active carbon particles are present within an unsintered network of carbon black/PTFE (fibrillated) material.

대표청구항 ▼

A method of preparation of matrix active layer for an electrode comprising intimately mixing carbon black particles having a particle size of from about 50 to about 3000 Angstroms and having a surface area of from about 25 to about 300 square meters per gram, with an aqueous dispersion of fibrillata

A method of preparation of matrix active layer for an electrode comprising intimately mixing carbon black particles having a particle size of from about 50 to about 3000 Angstroms and having a surface area of from about 25 to about 300 square meters per gram, with an aqueous dispersion of fibrillatable polytetrafluoroethylene particles; said mixture containing from 65 to about 75 percent carbon black particles and 25 to 35 percent polytetrafluoroethylene by weight; drying said mixture at temperatures in the range from about 250°to 325°C. from 10 to about 90 minutes; combining the thus dried PTFE/carbon black particulate component with deashed active carbon catalyst particles to form an intimate mix said catalyst particles amounting from between 40 to 80 weight percent of the entire mix; fibrillating said intimate mix and forming said fibrillated mixture into an active layer containing active carbon particles present within a network of carbon black and fibrillated polytetrafluoroethylene.