Nickel positive electrode plate for alkaline storage batteries and method for producing the same
A manufacturing method and nickel positive electrode technology, applied in the direction of alkaline battery electrodes, battery electrodes, active material electrodes, etc., can solve the problems of increased yttrium content, impossibility to obtain high specific capacity electrodes, low surface specific gravity, etc.
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Embodiment 1
[0032] Prepare a sintered nickel substrate with a sintered porosity of 85% under a reducing atmosphere. At 30°C, immerse the substrate in an aqueous solution containing 0.3mol / l yttrium nitrate and a pH value of 2.5, and then dry it in an atmosphere of 80°C. The yttrium salt is retained in the micropores of the substrate. Thereafter, the substrate was immersed in a 25% aqueous sodium hydroxide solution to convert the yttrium salt into yttrium hydroxide. Then, the substrate was rinsed in water to remove the alkaline solution and sufficiently dried in an 80° C. atmosphere. The yttrium hydroxide layer was thus formed in the pores of the sintered nickel substrate.
[0033] Then, immerse the substrate in an aqueous solution containing 5.5 mol / l nickel nitrate and 0.06 mol / l cobalt nitrate at 80°C, with a pH value of 1.5, and fully dry it in an atmosphere of 80°C to make the mixture of nickel salt and cobalt salt Retained in the microwells of the substrate. The substrate was then...
Embodiment 2
[0037] The same sintered nickel substrate with a porosity of 85% as in Example 1 was immersed in an aqueous solution containing 0.3 mol / l yttrium nitrate at 30° C. with a pH value of 2.5, and then fully dried under an atmosphere of 80° C. Then put the substrate at 80°C in 25% sodium hydroxide aqueous solution to convert the yttrium salt into yttrium hydroxide, rinse it in water to remove the alkali solution, and dry it sufficiently under the atmosphere of 80°C to form the yttrium hydroxide layer before sintering. in the micropores of the nickel substrate.
[0038]Then, the substrate was immersed in an aqueous solution of pH 1.5 containing 5.5 mol / l nickel nitrate, 0.06 mol / l cobalt nitrate and 0.08 mol / l zinc nitrate at 80°C, and then fully dried in an atmosphere of 80°C. Then immerse the substrate in 25% sodium hydroxide aqueous solution at 80°C to convert nickel salt, cobalt salt and zinc salt into nickel hydroxide, cobalt hydroxide and zinc hydroxide respectively. The subs...
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