Zinc alloy powder for alkaline cell and method for producing same
An alkaline battery, zinc alloy technology, applied in the direction of alkaline battery electrodes, primary battery electrodes, dry batteries, etc., can solve the problem of insufficient hydrogen production volume and other problems
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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] Al
(ppm)
Bi
(ppm)
In
(ppm)
Fe
(ppm)
Pb
(ppm)
Cd
(ppm)
Cu
(ppm)
Example 1
34
42
500
1.5
6.4
0.7
0.5
Example 2
31
91
517
3.0
3.9
0.5
0.5
Example 3
32
122
498
2.0
5.2
0.6
0.4
Example 4
32
151
501
2.1
6.8
0.9
0.7
Example 5
32
272
497
2.7
3.7
0.5
0.3
...
Embodiment 8-14
[0043] 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
[0052] 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.
[0053] heat treatment temperature
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