Hydrogen-storage alloy particles, alloy powder for electrode, and alkaline storage battery
A technology of hydrogen storage alloys and particles, applied in secondary batteries, battery electrodes, hydrogen, etc., can solve problems such as the decline of discharge characteristics, and achieve the effect of low-temperature discharge characteristics.
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Embodiment 1
[0065] First, the preparation of the powder of the hydrogen storage alloy particles will be described in detail.
[0066] (Preparation of alloy powder)
[0067] Contains 15% by mass of Ce and 80% by mass of La, and the remainder is mixed with powder of Pr and Nd, that is, a cerium-lanthanum alloy, a single Ni, a single Co, a single Mn, and a single Al in a predetermined ratio. Then, the obtained mixture was placed in a high-frequency melting furnace and melted by heating to 1500°C. Then, with 1×10 4 The resulting melt was cooled at a cooling rate of °C / sec, and a solidified body was obtained. Take MmNi 4.2 co 0.4 mn 0.4 Al 0.3 The composition of represents the obtained solidified body. Then, as shown in Table 1 below, the obtained solidified body was heat-treated under conditions of a heat treatment temperature of 950° C. and a heat treatment time of 6 hours.
[0068] Then, the heat-treated solidified body was pulverized by a jaw crusher to obtain coarse particles cont...
Embodiment 2~8
[0089] [embodiment 2~8, and comparative example 1~5]
[0090] Except for selecting the cooling temperature, heat treatment temperature, and heat treatment time shown in Table 1, nickel-metal hydride secondary batteries were manufactured in the same manner as in Example 1, and evaluated. In addition, in Examples 7 and 8 and Comparative Examples 3 to 5, by changing the composition, as shown in Table 2, the contents of Ni and Co in the hydrogen storage alloy were changed. The results are shown in Tables 1-3.
[0091] It can be seen from Table 3 that when the hydrogen storage alloys of Examples 1 to 8 of the present invention are used, good low-temperature discharge characteristics are obtained. In addition, in the case of Comparative Examples 1, 2, and 4 in which the average particle diameter of the segregation phase was out of the range of 1 to 5 nm, the low-temperature discharge characteristics decreased. This is generally considered to be due to a reduction in the catalytic ...
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