Method of making a high rate carbon cathode
AssigneeThe United States of America as represented by the Secretary of the Army
InventorSol Gilman
Life of this patent
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Abstract
A high rate carbon cathode is made by mixing a carbon powder having a sure area of about 1000 square meters/gram with polytetrafluoroethylene and a sufficient amount of water to form a coherent mixture. The mixture is applied to an electrically conductive screen; the cathode formed while wet to an intermediate thickness, the cathode vacuum dried at about 100 degrees C., and the cathode cold compressed to obtain a final electrode porosity of greater than 80 percent. The cathode can be used in a lithium primary cell using a solution of an inorganic lithium salt in sulfuryl chloride as the electrolyte.
Claims5
Method of making a high rate carbon cathode for use in lithium-sulfuryl chloride battery cells, said method including the steps of:
- (A) mixing a carbon powder having a surface area of about 1000 square meters/gram with polytetrafluoroethylene and a sufficient amount of water to form a coherent mixture;
- (B) applying the mixture to an electrically conductive screen,
- (C) forming the cathode while wet to an intermediate thickness;
- (D) vacuum drying the cathode at a temperature of about 100 degrees C.;
- and
- (E) cold compressing the cathode to obtain a final electrode porosity of greater than 80 percent.
Method of making a high rate carbon cathode for use in lithium sulfuryl chloride battery cells, said method including the steps of:
- (A) mixing a carbon powder having a surface area of about 1000 square meters/gram with polytetrafluoroethylene and a sufficient amount of water to form a coherent mixture, the polytetrafluoroethylene being about 7 to 14 weight percent on a dry basis of the coherent mixture,
- (B) applying the mixture to a nickel screen having a high tortuosity for good anchoring of the polytetrafluoroethylene carbon mixture,
- (C) forming the cathode while wet to an intermediate thickness,
- (D) vacuum drying the cathode at a temperature of about 100 degrees C., and
- (E) cold compressing the cathode to obtain a final electrode porosity of greater than 80 percent.
Dependencies are inferred from the claim text.