Electrolytic manganese dioxide, positive electrode active material, and battery
A technology of electrolytic manganese dioxide and active materials, applied in the direction of manganese oxide/manganese hydroxide, battery electrodes, circuits, etc., can solve the problems of battery corrosion and insufficient reinforcement
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example 1
[0051] Electrolytic manganese dioxide was produced using an electrolytic vessel having an internal volume of 20 liters equipped with a heating device, in which a titanium plate serving as a cathode and a graphite plate serving as an anode were suspended so as to face each other. An aqueous solution of manganese sulfate was used as the electrolytic solution. The composition of the electrolytic solution was adjusted so that the concentration of divalent manganese was 40 g / l and the concentration of sulfuric acid was 50 g / l. The temperature of the electrolyte is kept at 95°C, and the current density is 60A / m 2 .
[0052] After completion of the electrolysis, the thus deposited electrolytic manganese dioxide was washed with pure water and separated by compaction. The electrolytic manganese dioxide block is crushed into powder. The powder was neutralized until its JIS-pH value reached 3.14, the neutralized powder was washed with water, and then dried to obtain powdery electrolyt...
example 7
[0067] Powdery electrolytic manganese dioxide was produced by the same procedure as described in Example 1, wherein the deposited electrolytic manganese dioxide was washed with pure water and separated by compaction. The electrolytic manganese dioxide mass was then pulverized into a powder and the particle diameter was measured by the above-mentioned light scattering particle counting device "Micro-trac particle size distribution measuring device". The resulting powder was washed and neutralized until the JIS-pH value reached 2.98, and the neutralized powder was washed with water and then dried to obtain powdery electrolytic manganese dioxide.
[0068] The powdery electrolytic manganese dioxide contained 13.8% by number of fine powders with a particle size smaller than 1 μm. The median particle size is 45 μm.
[0069] The powdery electrolytic manganese dioxide was dissolved in an aqueous solution of hydrochloric acid and hydrogen peroxide, and then the sulfate group content w...
example 12
[0076] Powdery electrolytic manganese dioxide was produced by the same procedure as described in Example 7, wherein the produced powdery electrolytic manganese dioxide was neutralized until the JIS-pH value reached 2.19 instead of 2.98, and all other conditions were kept the same. The surface sulfate content was 0.04% by weight. The sodium content is 1500ppm. The powdery electrolytic manganese dioxide contained 2.8% by number of fine powders with a particle size smaller than 1 μm. The median particle size is 70 μm.
[0077] A powdery mixture including 10 g of powdery electrolytic manganese dioxide, 0.7 g of graphite and 0.3 g of a 40% by weight potassium hydroxide electrolyte was compression molded into a spherical molding (diameter 20 mm) at a molding pressure of 2.5 tons. Corrosion testing was performed by the same method as described in Example 7. The corrosion rate is less than 0.01mm / y.
[0078] 5 g of a powdered mixture comprising 85.8% by weight of powdered manganes...
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