Zinc alloy powder for alkaline cell and method for producing same
A technology of alkaline batteries and zinc alloys, which is applied to the electrodes of alkaline batteries, electrodes of primary batteries, dry batteries, etc., and can solve the problem of not being able to reduce the volume of hydrogen gas generated
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Embodiment 1-7
[0036] First, the metals Al, Bi, and In are mixed and melted with Zn to obtain a molten zinc alloy, which is sprayed into the air and pulverized by a gas pulverization method. Then, sieve with a sieve to obtain zinc alloy powder with a particle size of about 35 to 200 mesh. The composition of each zinc alloy powder obtained above was analyzed by atomic absorption method. The results are shown in Table 1.
[0037] Table 1
[0038]
[0039] Then, each zinc alloy powder obtained above was heat-treated in a heat treatment furnace for 30 minutes at a temperature of 300° C. under a nitrogen atmosphere, and then gradually cooled to room temperature in a nitrogen atmosphere. The bulk density of each zinc alloy powder heat-treated by this method was measured by the method specified in JIS Z2504. In addition, the size of the crystal grains of each zinc alloy powder uses the Zephery area meter method (the cross-sectional area of the crystal grains is divided by the value of the...
Embodiment 8-14
[0045] For having the zinc alloy powder of composition as shown in table 1, make with the method identical with embodiment 1-7, then carry out heat treatment with the method identical with embodiment 1-7, difference is: heat treatment temperature is 400 ℃ . For the zinc alloy powder obtained through the above heat treatment, bulk density, initial gas volume, and gas volume after overdischarge were measured in the same manner as in Examples 1-7 (only the bulk density of Examples 10-14 was measured). These data results are presented in Table 2 and Figure 1-3 shown in .
Embodiment 15-19， and comparative example 14-17
[0054] As shown in Table 3, zinc alloy powder containing 30 ppm of Al, 90 ppm of Bi, and 500 ppm of In was prepared and subjected to heat treatment (no heat treatment step in Comparative Example 9). For the above heat-treated zinc alloy powder, the same method as in Examples 1-7 was used to measure the initial gas (gas volume before discharge) volume. Measurement results are given in Table 3 and Image 6 shown in . From Table 3 and Image 6 It can be seen that when heat treatment is performed at a heat treatment temperature of 300-400° C. according to Examples 15 to 19, the volume of the initial gas can be greatly reduced.
[0055] table 3
[0056]
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