Electrolytic manganese dioxide, and method for its production and its application

A technology for electrolytic manganese dioxide and a manufacturing method, which is applied to electrolytic components, electrolytic processes, circuits, etc., can solve the problems of reduced utilization rate, short time, and inability to fully utilize manganese dioxide, and achieve stable manufacturing, alkaline potential and other problems. high effect

Active Publication Date: 2008-11-19
TOSOH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, as the discharge current increases, the utilization rate of manganese dioxide as the positive electrode active material decreases, and since the alkaline manganese dry battery cannot be used in a state where the discharge voltage is lowered, there is a problem that the actual discharge capacity is greatly impaired.
That is, if an alkaline manganese dry battery is used in a device using a large current ...

Method used

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  • Electrolytic manganese dioxide, and method for its production and its application
  • Electrolytic manganese dioxide, and method for its production and its application
  • Electrolytic manganese dioxide, and method for its production and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] The current density is 0.5A / dm 2 , The electrolysis temperature is 96°C, the electrolysis replenishment liquid is a manganese sulfate solution with a manganese concentration of 50.0g / l, the sulfuric acid concentrations in the initial stage of electrolysis and the second half of electrolysis are 29.2g / l and 74.8g / l respectively, and it is carried out like this for 16 days electrolysis. Electrolysis was performed for 13 days at the concentration of the first half range, and electrolysis was performed for 3 days at the concentration of the second half range. Table 1 shows the physical properties and battery characteristics of the obtained manganese dioxide.

Embodiment 2

[0095] The current density is 0.5A / dm 2 , The electrolysis temperature is 96°C, the electrolysis replenishment liquid is a manganese sulfate solution with a manganese concentration of 40.0g / l, the sulfuric acid concentrations in the initial stage of electrolysis and the second half of electrolysis are 29.2g / l and 49.2g / l respectively, and it is carried out like this for 14 days electrolysis. Electrolysis was performed for 10 days at the concentration of the first half range, and electrolysis was performed for 4 days at the concentration of the second half range.

Embodiment 3

[0097] Except that the sulfuric acid concentration in the electrolytic solution in the first 12 days of electrolysis is 29.2g / l, and the sulfuric acid concentration in the electrolytic solution in the latter 2 days of electrolysis is 44.7g / l, obtain electrolytic dioxide by the same method as Example 2 manganese.

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Abstract

To provide electrolytic manganese dioxide to be used as a cathode active material for an alkali-manganese dry cell, which has a high alkali potential and is provided with a high reactivity and packing efficiency as a cathode for the cell. Electrolytic manganese dioxide having an alkali potential of at least 310 mV, FWHM of at least 2.2 DEG and at most 3.0 DEG , and a (110)/(021) peak intensity ratio in the X-ray diffraction peaks of at least 0.50 and at most 0.80, is used. The (110) interplanar spacing of the electrolytic manganese dioxide is preferably at least 4.00 AA and at most 4.06 AA. Particularly when the alkali potential is at least 350 mV and at most 400 mV, the molar ratio of structural water contained (H 2 O/MnO 2 ) is preferably at least 0.20. It can be produced by electrolysis at a low sulfuric acid concentration at the initial stage of the electrolysis and at a high sulfuric acid concentration at a later stage. It is preferred to further carry out sulfuric acid treatment.

Description

technical field [0001] The present invention relates to electrolytic manganese dioxide used as a positive electrode active material in, for example, manganese dry batteries, particularly alkaline manganese dry batteries, a method for producing the same, and uses thereof. Background technique [0002] Manganese dioxide is known as, for example, a positive electrode active material for manganese dry batteries and alkaline manganese dry batteries, and has advantages of excellent storage stability and low cost. In particular, alkaline manganese dry batteries using manganese dioxide as a positive electrode active material are widely used in digital cameras, portable recorders, portable information devices, and even game machines and toys due to their excellent discharge characteristics under heavy loads. Its demand expanded rapidly. [0003] However, as the discharge current increases, the utilization rate of manganese dioxide as the positive electrode active material decreases,...

Claims

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Application Information

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IPC IPC(8): C25B1/21H01M4/50
CPCY02E60/10
Inventor 末次和正熊谷伸三浦比吕志
Owner TOSOH CORP
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