Porous nickel foil for negative electrode of alkaline battery, production method therefor and production device therefor

Abstract

A porous nickel foil for a negative electrode of an alkaline battery formed by an electrolytic deposition method, wherein the porous nickel foil is flexible and has a thickness of 10-35 μm and a Vickers hardness of 70-130. An electrodeposition drum for producing porous metal foil by an electrolytic deposition method including a drum having a surface onto which metal foil is deposited, a plurality of holes formed in the surface and an insulating resin filled in the holes, wherein the ratio of depth L and diameter D (L/D) of the hole is at least 1 and no clearance, into which deposited metal otherwise cuts in a wedge shape, exists at the boundary between the insulating resin filled in the hole and an opening edge of the hole.

1 . A porous nickel foil for a negative electrode of an alkaline battery formed by an electrolytic deposition method, wherein the porous nickel foil is flexible and has a thickness of 10-35 μm and a Vickers hardness of 70-130.  
     
     
         2 - 3 . (canceled)  
     
     
         4 . An electrodeposition drum for producing a porous metal foil by an electrolytic deposition method comprising a drum having a surface onto which metal foil is deposited, a plurality of holes formed in the surface and an insulating resin filled in the holes, wherein the ratio of depth L and diameter D (L/D) of the hole is at least 1 and no clearance, into which deposited metal otherwise cuts in a wedge shape, wherein no opening exists at the boundary between the insulating resin filled in the hole and an opening edge of the hole.  
     
     
         5 . The drum according to  claim 4 , wherein the insulating resin is one that does not separate from the inner wall of the hole by shrinkage during curing.  
     
     
         6 . The drum according to  claim 4 , wherein the insulating resin is a silicone resin.  
     
     
         7 . The drum according to  claim 5 , wherein an adhesive strength between the insulating resin and the inner wall of the hole is greater than a stress generated on the insulating resin when metal foil is peeled off the electrodeposition drum.