US 4,060,668 A · Primary electrochemical cell

Abstract

A primary electrochemical cell is described in which a novel granular cathode material is utilized. The cathode is formed from about 40 to 99 weight percent of carbon black, at least 1 weight percent of a mechanical binder which is inert in the primary electrochemical cell and the remainder thereof is graphite. The cathode material may be formed by mixing the individual components together with a quantity of a suitable liquid to form a uniform slurry. The slurry is then dried at room temperature to remove the liquid. The dried mixture is crumbled into fine particles. The particles are cured at an elevated temperature to stabilize the mechanical binder. The resulting material when utilized as the cathode material of a primary electrochemical cell provides a porous carbon structure of high surface area in which a network of large channels exists for continual diffusion of electrolytic solution to the carbon cathodic particles throughout the entire volume of the cell cathode regardless of the cell size.

Claims11

Dependent claims

A cathode material for placement in a primary electrochemical cell containing an electrolyte comprising:

an aggregate of porous semi-rigid globules having a composition of from about 40 to 99 weight percent of carbon black and at least 1 weight percent of a mechanical binder which is inert in the primary electrochemical cell, the remainder being graphite, a plurality of fluid-conducting channels being defined between boundaries of adjacent globules to insure diffusion of the electrolyte throughout the cathode material during the life of the cell.

Dependencies are inferred from the claim text.

Primary electrochemical cell

Life of this patent

Primary electrochemical cell

Life of this patent

Abstract

Claims11