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Problems solved by technology
That is, the conventional nickel-metal hydride storage battery has the problem that it is difficult to improve the self-discharge characteristics and the utilization rate of the positive electrode active material at the same time.
Method used
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Embodiment 1
[0073] 1. Manufacturing of batteries
[0074] (1) Production of positive electrode
[0075] Nickel sulfate, zinc sulfate and cobalt sulfate are weighed so that zinc becomes 4% by weight and cobalt becomes 1% by weight for nickel, and they are added to a 1N (normal concentration) sodium hydroxide aqueous solution containing ammonium ions, Adjust the mixed aqueous solution. While stirring the resulting mixed aqueous solution, gradually add 10N (normal concentration) sodium hydroxide aqueous solution to react in this mixed aqueous solution. In the reaction here, the pH is stabilized at 13 to 14, and nickel hydroxide Base particle 38 in which zinc and cobalt are solid-dissolved as a main body.
[0076] The obtained base particles 38 were washed three times with 10 times the amount of pure water, then dehydrated and dried. In addition, the obtained base particles 38 had a spherical shape with an average particle diameter of 10 μm.
[0077] Next, the obtained base particles 38 w...
Embodiment 2、3
[0092] (embodiment 2,3, comparative example 1,2)
[0093] Appropriately change the amount of aluminum hydroxide added in the positive electrode mixture paste. Table 1 represents the weight part of the content of aluminum hydroxide in the positive electrode for 100 parts by weight of the positive electrode active material powder, except that shown in table 1. Except for this value, nickel-metal hydride storage batteries (batteries b, c, i, j) were produced in the same manner as battery a in Example 1.
Embodiment 4、5
[0094] (embodiment 4,5, comparative example 3,4)
[0095] The concentration of the lithium hydroxide aqueous solution sprayed on the intermediate product particles was appropriately changed, and the amount of LiOH contained in the battery was shown in Table 1 (the value obtained as the amount of LiOH per positive electrode unit capacity), except for the amount of LiOH shown in Table 1. The values other than the values were the same as those of battery b in Example 2, and nickel-hydrogen storage batteries (batteries d, e, k, and 1) were obtained.
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Abstract
The alkaline storage battery (2) simultaneously accommodates the electrode group (22) and alkaline electrolyte formed by the positive electrode (24) and the negative electrode (26) overlapping each other through the diaphragm, and the positive electrode (24) has positive electrode active material powder and A positive electrode mixture formed by a positive electrode additive material (50), the positive electrode active material powder is formed of positive electrode active material particles (36), and the positive electrode active material particles (36) have a base particle (38) containing nickel hydroxide, and a covering On the surface of the base particle (38) is a conductive layer (40) formed by a Co compound containing Li. The positive electrode additive material (50) is distributed in the positive electrode active material powder and contains aluminum hydroxide. For 100 parts by weight of the positive electrode active Substance powder, the content U (parts by weight) of the positive electrode additive material is in the range of 0.01≤U<1.5, the alkaline storage battery (2) contains Li, and the total amount of Li in the alkaline storage battery (2) is within the range of When Li is converted into LiOH and the Li weight required per 1 Ah of positive electrode capacity is obtained, it is 20 to 30 (mg / Ah).
Description
technical field [0001] The present invention relates to alkaline storage batteries. Background technique [0002] An alkaline storage battery is a storage battery that uses an alkaline electrolyte as an electrolyte. A nickel-hydrogen storage battery is known as one of such alkaline storage batteries. The nickel-metal hydride storage battery has: a positive electrode holding a positive electrode active material formed of nickel hydroxide; and a negative electrode containing a hydrogen storage alloy. Compared with nickel-cadmium storage batteries, such nickel-metal hydride storage batteries have the advantages of larger capacity and better environmental safety, so they can be used in various applications such as various portable devices and hybrid electric vehicles. As described above, nickel-metal hydride storage batteries have been found to have various applications, and therefore it is desired to improve various characteristics. [0003] As one of the properties desired ...
Claims
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