Alkaline storage battery and process for preparing the same
First Claim
1. A nickel-cadmium alkaline storage battery, characterized in that the content of nickel hydroxide or nickel oxide or both in a negative active material is from 2 to 60 wt % based on the total amount of cadmium and that the content of cadmium hydroxide in the negative active material is 0.95 or lower in terms of a weight ratio to nickel hydroxide in a positive active material.
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Abstract
This invention is to provide a nickel-cadmium alkaline storage battery in which the content of nickel hydroxide and/or nickel oxide in a negative active material is from 2 to 60 wt% based on the total amount of cadmium, and the content of cadmium hydroxide in the negative active material is 0.95 or lower in terms of a weight ratio to nickel hydroxide in a positive active material; a manganese dioxide-cadmium alkaline storage battery in which the content of cadmium hydroxide in a negative active material in the discharged state is 0.84 or lower in terms of a weight ratio to manganese dioxide in a positive active material; and a silver oxide-cadmium alkaline storage battery in which the content of cadmium hydroxide in a negative active material in the discharged state is 1.36 or lower in terms of a weight ratio to silver in a positive active material. According to the alkaline storage battery of the present invention, charge control can easily be done with high accuracy because the battery shows abrupt and considerable changes in voltage in the final stage of charge, and further, since the battery need almost no cadmium hydroxide for reserve, an oxygen gas generated from a positive electrode can be absorbed efficiently, so that it is also possible to perform, with high reliability, quick 1C charge of rectangular batteries and superquick charge such as 10C charge.
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12 Claims
- 1. A nickel-cadmium alkaline storage battery, characterized in that the content of nickel hydroxide or nickel oxide or both in a negative active material is from 2 to 60 wt % based on the total amount of cadmium and that the content of cadmium hydroxide in the negative active material is 0.95 or lower in terms of a weight ratio to nickel hydroxide in a positive active material.
- 2. A manganese dioxide-cadmium alkaline storage battery comprising a positive electrode comprising manganese dioxide as an active material and a negative electrode comprising metallic cadmium as an active material, characterized in that the content of cadmium hydroxide in the negative active material, as measured when the battery is in the discharged state, is 0.84 or lower in terms of a weight ratio to manganese dioxide in the positive active material.
- 3. A silver oxide-cadmium alkaline storage battery employing a positive electrode comprising silver oxide as active material and a negative electrode comprising metallic cadmium as an active material, characterized in that the content of cadmium hydroxide in the negative active material, as measured when the battery is in the discharged state, is 1.36 or lower in terms of a weight ratio to silver in the positive active material.
Specification