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Preparation method of ultra fine manganese dioxide

A technology of manganese dioxide and manganese oxide, applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problem that the effect of battery hydrogen absorption materials is not ideal, and achieve the effect of improving hydrogen absorption effect, capacity and service life

Inactive Publication Date: 2004-07-21
章浩龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With this method, only larger particles of manganese dioxide can be obtained, which is not ideal as a hydrogen absorbing material for batteries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: Weigh 136 grams of manganese dioxide, dissolve it in ethanol, and slowly add dropwise an ethanol solution in which 80 grams of sodium hydroxide is dissolved under stirring, to obtain manganese hydroxide precipitate. Calcined for 12 hours after filtration, about 90 grams of superfine manganese dioxide powder can be obtained.

[0012] In this example, H was added dropwise before filtration 2 o 2 Making it completely black can speed up the oxidation speed of manganese hydroxide. After filtering, calcining for 2-4 hours, about 90 grams of superfine manganese dioxide can be obtained.

Embodiment 2

[0013] Example 2: 136 grams of manganese dioxide was weighed, dissolved in ethanol, and slowly added dropwise with stirring an ethanol solution in which 112 grams of potassium hydroxide was dissolved to obtain manganese hydroxide precipitate. Calcined for 12 hours after filtration, about 90 grams of superfine manganese dioxide powder can be obtained.

[0014] In this example, H was added dropwise before filtration 2 o 2 Making it completely black can speed up the oxidation speed of manganese hydroxide. After filtering, calcining for 2-4 hours, about 90 grams of superfine manganese dioxide can be obtained.

Embodiment 3

[0015] Embodiment 3: Weigh 136 grams of manganese dioxide, dissolve it in ethanol, slowly add 200 grams of 17% ammonia solution dropwise under stirring, and obtain manganese hydroxide precipitate. Calcined for 12 hours after filtration, about 90 grams of superfine manganese dioxide powder can be obtained.

[0016] In this example, H was added dropwise before filtration 2 o 2 Making it completely black can speed up the oxidation speed of manganese hydroxide. After filtering, calcining for 2-4 hours, about 90 grams of superfine manganese dioxide can be obtained.

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Abstract

A process for preparing superfine MnO2 includes adding surfactant to soluble Mn salt to form microemulsion, adding alkali to generate manganese hydroxide, oxidizing, dewatering, and calcining. Its advantages are small diameter (50 nm), high specific surface area (100 sq.m / g) and high hydrogen absorbing effect in ZnMn battery.

Description

technical field [0001] The invention relates to a preparation method of manganese dioxide, in particular to a preparation method of ultrafine manganese dioxide. Background technique [0002] Manganese oxide is generally used in zinc-manganese batteries as a hydrogen absorber for zinc-manganese batteries. However, the manganese oxide currently used in zinc-manganese batteries generally has a large particle size and a small specific surface area, and the hydrogen absorption effect is not ideal, which directly affects the capacity and service life of the battery. Its conventional production method is obtained by calcination or aqueous solution method. [0003] The patent document "A Method for Heaviing Chemical Manganese Dioxide" published by the China Intellectual Property Office on July 5, 2000 (the publication number is CN 1258643), this document introduces a kind of initial manganese dioxide obtained by calcining Manganese oxide is chemically reacted in manganese sulfate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02
Inventor 章浩龙赵雅琴
Owner 章浩龙
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