Dry molded cathode collector for liquid cathode systems
AssigneeEveready Battery Company, Inc.
InventorsJohn C. Bailey, Timothy D. Foley, Ernest D. Botos
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Abstract
Disclosed is a method of forming porous carbon cathode collectors for electrochemical cells by mixing carbon black with binder and liquid to form a dough, drying it at an elevated temperature, compacting the dried mix at an elevated temperature, milling it to a particle size greater than 0.05 mm and preferably 0.1 to 0.3 mm, and molding the dry milled mix, preferably by auger feeding, to form a collector having a pore size at least 50% by volume being 10 microns or larger and most preferably in the range of 10 to 90 microns.
Claims10
A method of forming porous carbon cathode collectors for electrochemical cells comprising the steps of:
- mixing carbon black and binder with sufficient added liquid to obtain effective distribution of the binder with the carbon black in the form of a dough;
- drying the dough mix to remove the added liquid;
- compacting by rolling to improve the cohesive nature of the dry mix while at an elevated temperature less than about 300 degrees C.;
- milling the dry compacted mix of carbon black and binder only until substantially all of the particles are greater than about 0.05 mm in diameter;
- and
- press molding the dry milled mix into a resultant porous collector with at least 50% by volume of the pores being 10 microns or larger in size.
A method of forming porous carbon cathode collectors for electrochemical cells comprising the steps of:
- mixing carbon black and binder with sufficient added liquid to obtain effective distribution of the binder with the carbon black in the form of a dough;
- drying the dough mix to remove the added liquid at an elevated temperature less than about 300 degrees C.;
- compacting by rolling to improve the cohesive nature of the dry mix while still at an elevated temperature less than about 300 degrees C.;
- milling the dry compacted mix of carbon black and binder only until the particles are substantially in the range of about 0.1 to about 0.3 mm;
- and
- press molding by auger feeding the dry milled mix to form a resultant porous collector with at least 40% by volume of the pores being in the range of about 10 microns to about 100 microns in diameter, and having a porosity of about 80% to 90% by volume.
Dependencies are inferred from the claim text.