ALKALINE SECONDARY BATTERY AND PROCESS FOR ITS PRODUCTION

摘要

A nickel-cadmium alkaline secondary battery wherein the content of nickel hydroxide and/or nickel oxide in a negative electrode active material is 2 to 60 wt % based on the total amount of cadmium and the ratio of the content of cadmium hydroxide in the negative electrode to the content of nickel hydroxide in a positive electrode active material is up to 0.95 by weight; a manganese-cadmium alkaline secondary battery wherein the ratio of the content of cadmium hydroxide in a negative electrode active material to that of manganese dioxide in a positive electrode active material by weight is up to 0.84 in an electrically discharged state; and a silver oxide-cadmium alkaline secondary battery wherein the ratio of the content of cadmium hydroxide in a negative electrode active material to the content of silver in a positive electrode active material by weight is up to 1.36 in an electrically discharged state are disclosed. These batteries show such sharp and remarkable changes in voltage in the final stage of charging that the charging can be controlled with high accuracy. They scarcely require reserve cadmium hydroxide and hence an oxygen gas generated from the positive electrode can be effectively absorbed, thus realizing rapid 1C-charging and ultrarapid 10C-charging of a rectangular battery with high reliability.