Abstract A dry cell of excellent performances, particularly in discharge characteristics, in which an ion-permeable barrier membrane is interposed between a cathode mixture and a negative electrodeconsistuting zinc casing and more specifically between the cathode mixture and a paste layer, said membrane being of such a character that it blocks the transfer of water and a paste from the paste layer side to the cathode mixture side without being dissolvedduring storage and in the earlier stages of discharge of the cell, whereas it is dissolved to prevent a sharp increase of the zinc ion concentration in the vicinity of the paste layer in the latter stage of dscharge of the cell when the zinc ion concentration in the electrolyte is increased.
A dry cell as defined in claim 1, in which said ion-permeable barrier membrane has colloidal silica contained therein.
Claim 2
Dependent Claim
38 words
A dry cell as defined in claim 1, in which said ion-permeable barrier membrane has contained therein at least one material selected from the group consisting of pulp, methyl cellulosE, methyl ethyl cellulose, carboxymethyl cellulose and hydroxypropyl cellulose.
Claim 3
Dependent Claim
32 words
A dry cell as defined in claim 1, in which said barrier membrane has contained therein at least one material selected from the group consisting of starch, wheat flour and corn starch.
Claim 4
Dependent Claim
18 words
A dry cell as defined in claim 1, in which said ion-permeable barrier membrane has polyacrylamide contained therein.
Claim 5
Dependent Claim
19 words
A dry cell as defined in claim 1, in which said ion-permeable barrier membrane has karaya rubber contained therein.
Claim 6
Dependent Claim
34 words
A dry cell as defined in claim 1, in which said ion-permeable barrier membrane has contained therein at least one material selected from ammonium chloride, zinc chloride, potassium chloride, sodium chloride and lithium chloride.