Dry cells

Abstract

A dry cell comprising a zinc anode, a depolarizing mix and a separator which functions to separate the anode from the depolarizing mix, said depolarizing mix containing manganese dioxide as its main component and acetylene black immersed in an electrolyte having zinc chloride as its main ingredient, said depolarizing mix containing water and chlorine in an amount of about 50 to 90 parts by weight and about 5.5 to 14.5 parts by weight, respectively, per 100 parts by weight of manganese dioxide, the chlorine being present in the form of said zinc chloride or zinc chloride with added hydrochloric acid; said depolarizing mix also containing said electrolyte in an amount in millimeters determined by multiplying the BET total surface area of manganese dioxide and acetylene black in m 2 /gram by a value of about 0.008 to 0.015, and said depolarizing mix further containing the electrolyte in an amount of about 2 to 4 ml. per gram of acetylene black.

What is claimed is: 
     
       1. A dry cell comprising a zinc anode, a depolarizing mix and a separator which functions to separate the anode from the depolarizing mix, said depolarizing mix containing manganese dioxide as its main component and acetylene black immersed in an electrolyte .Iadd.containing about 2 to 3.4 percent by weight of ammonium chloride and .Iaddend.having zinc chloride as its main ingredient, said depolarizing mix containing water and chlorine in an amount of about 50 to 90 parts by weight and about 5.5 to 14.5 parts by weight, respectively, per 100 parts by weight of manganese dioxide, the chlorine being present in the form of said zinc chloride or zinc chloride with added hydrochloric acid. .[.2. A dry cell having a zinc anode, an electrolyte containing zinc chloride as its main ingredient, and a depolarizing mix containing a mixture of manganese dioxide, acetylene black, and said electrolyte, said depolarizing mix containing water and chlorine in an amount of about 50 to 90 parts by weight and about 5.5 to 14.5 parts by weight, respectively, per 100 parts by weight of manganese dioxide, the electrolyte being present in said depolarizing mix in an amount in milliliters determined by multiplying the BET total surface area of manganese dioxide and acetylene black in m 2  /gram by a value of 
     
     
        about 0.008 to 0.015..]. 3. A dry cell having a zinc anode, an electrolyte containing .Iadd.about 2 to 3.4 percent by weight of ammonium chloride and having .Iaddend.zinc chloride as its main component, and a depolarizing mix containing a mixture of manganese dioxide, acetylene black, and said electrolyte, said depolarizing mix containing the electrolyte in an amount of about 2 to 4 ml. per gram of acetylene black, the content of water and chlorine in said depolarizing mix being about 50 to 90 parts by weight and about 5.5 to 14.5 parts by weight, respectively, per 100 parts by weight of manganese dioxide.Iadd., the chlorine being present in the form of said 
     
     
        zinc chloride or zinc chloride with added hydrochloric acid. .Iaddend. 4. The dry cell of claim 1, wherein the concentration of zinc chloride in the electrolyte is about 13 to 27 .[.parts.]. .Iadd.percent .Iaddend.by weight. .[.5. The dry cell of claim 2, wherein the concentration of zinc 
     
     
        chloride in the electrolyte is about 13 to 27 parts by weight..]. 6. The dry cell of claim 3, wherein the concentration of zinc chloride in the electrolyte is about 13 to 27 .[.parts.]. .Iadd.percent .Iaddend.by weight. .[.7. The dry cell of claim 1, wherein ammonium chloride is present in the electrolyte in an amount less than about 10 parts by weight..]. .[.8. The dry cell of claim 2, wherein ammonium chloride is present in the electrolyte in an amount less than about 10 parts by weight..]. .[.9. The dry cell of claim 3, wherein ammonium chloride is present in the electrolyte in an amount less than about 10 parts by 
     
     
        weight..]. 10. The dry cell of claim 1, wherein the separator is coated 
     
     
        with a paste material in an amount of about 8 to 70 g./m 2 . 11. The dry cell of claim 10, wherein the paste material is starch or methyl 
     
     
        cellulose. 12. The dry cell of claim 1, wherein the weight ratio of manganese dioxide to acetylene black is about 4/1 to 7/1. .[.13. The dry cell of claim 2, wherein the weight ratio of manganese dioxide to 
     
     
        acetylene black is about 4/1 to 7/1..]. 14. The dry cell of claim 3, wherein the weight ratio of manganese dioxide to acetylene black is about 
     
     
        4/1 to 7/1. 15. A depolarizing mix for use in a dry cell comprising manganese dioxide as its main component and acetylene black immersed in an electrolyte .Iadd.containing about 2 to 3.4 percent by weight of ammonium chloride and .Iaddend.having zinc chloride as its main ingredient, said depolarizing mix containing water and chlorine in an amount of about 50 to 90 parts .[.be.]. .Iadd.by .Iaddend.weight and about 5.5 to 14.5 parts by weight, respectively, per 100 parts by weight of manganese dioxide, the chlorine being present in the form of said zinc chloride or zinc chloride 
     
     
        with added hydrochloric acid. .[.16.  A depolarizing mix for use in a dry cell comprising a mixture of manganese dioxide, acetylene black, and an electrolyte having zinc chloride as its main ingredient, said depolarizing mix containing water and chlorine in an amount of about 50 to 90 parts by weight and about 5.5 to 14.5 parts by weight, respectively, per 100 parts by weight of manganese dioxide, the electrolyte being present in said depolarizing mix in an amount in milliliters determined by multiplying the BET total surface area of manganese dioxide and acetylene black in m 2   
     
     
        /gram by a value of about 0.008 to 0.015..]. 17. A depolarizing mix for use in a dry cell comprising a mixture of manganese dioxide, acetylene black, and an electrolyte .Iadd.containing about 2 to 3.4 percent by weight of ammonium chloride and .Iaddend.having zinc chloride as its main ingredient, said depolarizing mix containing the electrolyte in an amount of about 2 to 4 ml. per gram of acetylene black, the content of water and chlorine in said depolarizing mix being about 50 to 90 parts by weight and about 5.5 to 14.5 parts by weight, respectively, per 100 parts by weight of manganese dioxide.Iadd., the chlorine being present in the form of said zinc chloride or zinc chloride with added hydrochloric acid. .Iaddend. .Iadd. 18. The depolarizing mix of claim 15, wherein the concentration of zinc chloride in the electrolyte is about 13 to 27 percent by weight. .Iaddend..Iadd. 19. The depolarizing mix of claim 17, wherein the concentration of zinc chloride in the electrolyte is about 13 to 27 percent by weight. .Iaddend..Iadd. 20. The depolarizing mix of claim 15, wherein the weight ratio of manganese dioxide to acetylene black is about 4/1 to 7/1. .Iaddend..Iadd. 21. The depolarizing mix of claim 17, wherein the weight ratio of manganese dioxide to acetylene black is about 4/1 to 7/1. .Iaddend.