Alkaline battery
A dry battery, alkaline technology, applied in the direction of dry battery, alkaline storage battery electrode, alkaline electrolyte, etc.
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Examples
Embodiment 1 and comparative example 1～3
[0096] Follow the steps (1) to (3) below to make figure 1The single 3-shaped (ie LR6) alkaline dry cell shown.
[0097] (1) Production of positive electrode
[0098] Electrolytic manganese dioxide powder (manganese dioxide purity: 93%, average particle diameter D50: 40 μm, BET specific surface area: 26 m 2 / g), graphite powder (average particle diameter D50: 10 μm) as a conductive agent, and polytetrafluoroethylene as a resin binder were mixed.
[0099] An electrolytic solution is added to the mixture, and the mixture is sufficiently mixed to obtain a positive electrode mixture. The amounts of the resin binder and the electrolytic solution were 0.2 parts by mass and 2 parts by mass, respectively, based on 100 parts by mass of the total amount of the electrolytic manganese dioxide and the conductive agent. Alkaline aqueous solutions containing potassium hydroxide and zinc oxide at a concentration of 35% by mass and a concentration of 2% by mass were used for the electrolytic...
Embodiment 2～3
[0119] In (1) of Example 1, the mixing ratio of the electrolytic manganese dioxide and the conductive agent was adjusted for each pellet so that the ratio of the mass of the conductive agent to the total mass of the manganese dioxide and the conductive agent was as shown in Table 1. value. In addition, the height of the pellets was changed to 10.9 mm by adjusting the size of the mold. Except for these, positive electrode pellets were produced and evaluated in the same manner as in Example 1.
[0120] In (3) of Example 1, four positive electrode pellets were vertically inserted into the battery case 1 . At this time, in Example 2, such as image 3 As shown, each pellet is inserted so that the same pellet 12b is used as pellets of the first and fourth stages from the positive terminal side of the battery case 1, and two pellets with a low ratio of the conductive agent are used. 12a is located between these pellets (2nd stage and 3rd stage pellets). In Example 3, the pellets ...
Embodiment 4～8
[0127] The thickness of the main body of the battery case was changed as shown in Table 2. Except for this, an alkaline dry battery was produced in the same manner as in Example 1, and evaluations (a) and (c) were performed.
[0128] The results are shown in Table 2. Examples 4-8 are A4-A8. Table 2 also shows the results of A1 and B2 together.
[0129] [Table 2]
[0130]
[0131] As shown in Table 2, even if the thickness of the main body is as thin as 0.15 mm or less, by adjusting the ratio (or resistance) of the conductive agent between the central pellet and the end pellets, A1, A4 to A8 are compared with B2. The swelling of the main body part is less than that. From the viewpoint of obtaining a higher swelling suppressing effect, the thickness of the main body portion is preferably 0.08 mm or more.
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Abstract
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