Abstract A method of making a nickel positive electrode for use in an alkaline battery by immersing, a porous sintered plaque of nickel in an aqueous solution of a nitrate, nitrite nitro compound, amino compound, ammonate or the like of nickel, cathodically polarizing the nickel plaque so as to cause the continuous deposition of an active material forming substance in the pores of the plaque without the accompanyment of the undesirable generation of hydrogen and then immersing the cathodically polarized nickel plaque in water above 65* C, preferably above 95* C, to convert the active material forming substance into nickel hydroxide and also to convert a part of the metallic nickel constituting the plaque into nickel hydroxide thereby filling the pores of the plaque with the active material within a short period of time with high efficiency.
A method of making A nickel positive electrode for use in an alkaline battery as claimed in claim 1, in which a weak basic substance such as nickel hydroxide or ammonia which does not impart any damage to the battery is added to said hot water to adjust the pH value of said warm or hot water in the range of 5.0 to 7.0.
Claim 2
Dependent Claim
50 words
A method of making a nickel positive electrode for use in an alkaline battery as claimed in claim 1, in which a part which is less than 10 percent of the metallic nickel constituting said nickel plaque is converted into the active material by the treatment with said hot water.
Claim 3
Dependent Claim
32 words
A method of making a nickel positive electrode for use in an alkaline battery as claimed in claim 1, in which said hot water contains 0.01 mol of a nitrogen compound therein.
Claim 4
Dependent Claim
33 words
A method of making a nickel positive electrode for use in an alkaline battery as claimed in claim 1, in which said hot water contains at least 0.05 mol of nickel ions therein.
Claim 5
Dependent Claim
30 words
A method of making a nickel positive electrode for use in an alkaline battery as claimed in claim 1, in which said hot water contains a surface active agent therein.
Claim 6
Independent Claim
118 words
A method of making a nickel positive electrode for use in an alkaline battery comprising the steps of preparing an electrolyte containing nickel ions and at least one of the group consisting of nitrate ions, nitrite ions, ammonium ions and amino radical, placing a porous nickel plaque in said electrolyte, cathodically polarizing said plaque in said electrolyte so as to deposit within the pores of said plaque an amorphous material for forming a positive electrode active material, and then immediately immersing for immersion treatment said plaque in hot water at a temperature of from 95* C to the boiling point for from 20 to 30 minutes so as to convert said amorphous material into a crystalline active material.