Hydrogen-absorbing alloy electrode, method for producing hydrogen-absorbing alloy electrode and alkaline secondary accumulator
A kind of hydrogen absorbing alloy, technology of manufacturing method
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Embodiment 1～3 and comparative example 1～3
[0038] In these Examples and Comparative Examples, the cerium-lanthanum alloy (Mm) and Ni, Co, Al, and Mn of a mixture of rare earth elements were weighed and mixed to make the composition MmNi 3.1 co 0.8 Al 0.4 mn 0.7 composition. After melting and alloying, it is mechanically pulverized to obtain hydrogen-absorbing alloy powder.
[0039] Next, the surface of the hydrogen-absorbing alloy powder obtained above was treated in an acidic solution using hydrochloric acid.
[0040] Here, when treating the surface of the hydrogen-absorbing alloy powder obtained above in an acidic solution using hydrochloric acid, as shown in Table 1 below, the initial pH of the acidic solution was set to 1.0, and the liquid temperature was set to 25°C. Simultaneously, in shown embodiment 1-3 and comparative example 1-3, with the ratio shown in this table respectively, aluminum chloride AlCl 3 As aluminide, cobalt chloride CoCl 2 Added to the above acidic solution as cobalt compound. At the sa...
Embodiment 4-6 and comparative example 4-6
[0055] In these Examples 4-6 and Comparative Examples 4-6, as in the case of the aforementioned Examples 1-3 and Comparative Examples 1-3, the hydrogen-absorbing alloy obtained by pulverization was subjected to surface treatment in an acidic solution. At this time, the liquid temperature of the acidic solution was set at 25°C, and at the same time, the AlCl 3 , and CoCl 2 And anthraquinone is added to the above acidic solution. Its addition is shown in the following table 3, in embodiment 4 and the addition in embodiment 1 is the same, in embodiment 5 and the addition in embodiment 2 is the same, in embodiment 6 and in embodiment 3 Similarly, in Comparative Example 4, it was the same as in Comparative Example 1, in Comparative Example 5, it was the same as in Comparative Example 2, and in Comparative Example 6, it was the same as in Comparative Example 3. At the same time, as shown in the table. The initial pH value in the above-mentioned acidic solution was changed, and th...
Embodiment 7-9 and comparative example 7-9
[0063] In these Examples 7-9 and Comparative Examples 7-9, as in the foregoing Examples 1-3 and Comparative Examples 1-3, the hydrogen-absorbing alloy obtained by pulverization was subjected to surface treatment in an acidic solution. At this time, The initial pH value of the acidic solution was set to 1.0, and at the same time, the AlCl 3 , and CoCl 2 And anthraquinone is added to the above acidic solution. Its addition amount is as shown in following table 4, in embodiment 7 and the addition amount in embodiment 1 is the same, in embodiment 8 and the addition amount in embodiment 2 is the same, in embodiment 9 and in embodiment 3 The addition amount is the same, in Comparative Example 7, the addition amount in Comparative Example 1 is the same, in Comparative Example 8, the addition amount in Comparative Example 2 is the same, and in Comparative Example 9, the addition amount in Comparative Example 3 is the same. At the same time, as shown in the table. The initial pH val...
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