Positive electrode plate for alkaline battery and making method thereof
A battery and positive electrode technology, which is applied in the field of positive electrode plate and its manufacturing, can solve the problems of active material loss, reduce the strength of welded parts, and it is difficult to further increase the filling rate at the current level, so as to reduce the loss and achieve precise definition Effect
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example 1
[0112] (i) Active material carrying conductive material on its surface
[0113] Nickel hydroxide solid solution particles used as an active material were prepared by the following known method. Specifically, an aqueous solution of sodium hydroxide is added dropwise to another aqueous solution in which nickel sulfate is mainly dissolved and has a predetermined amount of cobalt sulfate and zinc sulfate therein, while ammonia water is used to adjust the concentration of the aqueous solution. PH value, thus precipitated spherical particles of nickel hydroxide solid solution.
[0114] The resulting nickel hydroxide solid solution particles were then washed with water and dried. The obtained particles, hereinafter referred to as core particles, had an average particle size of 10 μm and a specific surface area of 12 m 2 / g. It should be noted that the average particle size was measured by a laser diffraction particle size analyzer, and the specific surface area was measured by t...
example 2
[0173] A positive electrode plate was prepared in the same manner as in Example 1 except that the slurry filling rate was changed to the data shown in Table 3.
[0174] [Evaluate]
[0175] The following tests were performed on the positive electrode plates prepared above. The results are shown in Table 3.
[0176] (i) Determine the maximum height of the metal burr formed in the cutting step.
[0177] (ii) 1000 electrode groups were prepared, each electrode group was prepared by spirally winding a positive electrode plate and a known hydrogen storage alloy electrode with a 100 μm thick polypropylene separator in between. During the preparation of each electrode group, the percentage ratio (%) of the weight of the material mixture separated in the spiral winding step to the weight of the positive electrode plate was measured. The average value of 1000 electrode sets is then calculated, which is called the separation rate of the material mixture.
[0178] (iii) Measure the th...
example 3
[0184] Except changing the amount of CMC and the amount of xanthan gum per 100 parts by weight of the active material carrying the conductive material to the values shown in Table 4, and changing the slurry viscosity and viscosity ratio to one of the values shown in Table 4 Besides, a positive electrode plate was prepared in the same manner as in Example 1. Then, a nickel metal hydride storage battery was prepared in the same manner as in Example 1 except that the positive electrode plate prepared above was used.
[0185] [Evaluate]
[0186] The above-prepared positive electrode plates and nickel metal hydride storage batteries were tested as follows. The results are shown in Table 4.
[0187] (i) Measure the change in the filling rate of the slurry. Here, the slurry filling amount is monitored by an X-ray gravimetric analyzer in the slurry filling step to determine the maximum amount and the minimum amount. Then, calculate the difference between them. The percentage ...
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