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Preparation method for large-grained spherical cobalt oxyhydroxide

A technology of cobalt oxyhydroxide and sodium hydroxide, applied in chemical instruments and methods, cobalt oxide/cobalt hydroxide, cobalt compounds, etc., can solve problems such as poor product stability, reduced mixing efficiency and effect, uneven reaction, etc. Achieve the effect of strong product stability, increase effect and efficiency

Active Publication Date: 2013-08-07
HUNAN YACHENG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the morphology of the cobalt oxyhydroxide produced by the above-mentioned disclosed method is not spherical, which will cause uneven mixing in downstream industries, reduce the efficiency and effect of mixing, and the product stability is relatively poor. Adding an oxidizing agent during the synthesis process will cause Causes uneven reaction, making it difficult to mass-produce

Method used

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  • Preparation method for large-grained spherical cobalt oxyhydroxide
  • Preparation method for large-grained spherical cobalt oxyhydroxide
  • Preparation method for large-grained spherical cobalt oxyhydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Cobalt liquid configuration: Weigh 1.5 kg of cobalt chloride crystals, add deionized water to dissolve, and set the volume to 5 liters. In order to configure enough cobalt liquid, the above steps can be repeated;

[0028] 2. Alkaline preparation: Weigh 1 kg of sodium hydroxide crystals, add deionized water to dissolve, set the volume to 3 liters, then add 0.7 L of ammonia water with 25% ammonia content and 20 ml of hydrazine hydrate solution with 80% content, and finally Set the volume to 5L, in order to configure enough lye, the above steps can be repeated;

[0029] 3. Clean the reaction kettle, and pump the cobalt solution in step 1 and the lye solution in step 2 at the same time under the conditions of pH 11.1, temperature 65°C, rotation speed (300-rpm) and nitrogen protection, and adjust the hydrogen The flow rate of sodium oxide is stable and the pH value is controlled at 11.1, and the reaction is continuous. After 12 hours of feeding, the particle size of the s...

Embodiment 2

[0033] 1. Cobalt liquid configuration: Weigh 2.2 kg of cobalt chloride crystals, add deionized water to dissolve, and set the volume to 5 liters. In order to configure enough cobalt liquid, the above steps can be repeated;

[0034] 2. Alkaline preparation: Weigh 1 kg of sodium hydroxide crystals, add deionized water to dissolve, and set the volume to 3 liters, then add 0.9L ammonia water with 25% ammonia content and 20 ml hydrazine hydrate solution with 80% content, and finally Set the volume to 5L, in order to configure enough lye, the above steps can be repeated;

[0035] 3. Clean the reaction kettle, and pump the cobalt liquid in step 1 and the lye in step 2 at the same time under the protection conditions of pH value 10.9, temperature 50°C, rotation speed (350-rpm) and nitrogen gas, and adjust the hydrogen The flow rate of sodium oxide is stable and the pH value is controlled at 10.9, and the reaction is continuous. After 12 hours of feeding, the particle size of the slurr...

Embodiment 3

[0039] 1. Cobalt liquid configuration: Weigh 1.9 kg of cobalt sulfate crystals, add deionized water to dissolve, and set the volume to 5 liters. In order to configure enough cobalt liquid, the above steps can be repeated;

[0040]2. Alkaline preparation: Weigh 1 kg of sodium hydroxide crystals, add deionized water to dissolve, and set the volume to 3 liters, then add 0.9L ammonia water with 25% ammonia content and 20 ml hydrazine hydrate solution with 80% content, and finally Set the volume to 5L, in order to configure enough lye, the above steps can be repeated;

[0041] 3. Clean the reaction kettle, and pump the cobalt solution in step 1 and the lye solution in step 2 at the same time under the conditions of pH 11.5, temperature 40°C, rotation speed (400-rpm) and nitrogen protection, and adjust the hydrogen The flow rate of sodium oxide is stable and the pH value is controlled at 11.5, and the reaction is continuous. After 12 hours of feeding, the particle size of the slurry...

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Abstract

The present invention provides a preparation method for large-grained spherical cobalt oxyhydroxide. The specific method is as follows: (1) preparing a 0.5-2.0mol / L cobalt salt solution and a 5-10mol / L sodium hydroxide solution, and adding a complexing agent and a reducing agent in the sodium hydroxide solution; (2) under the protection of nitrogen, simultaneously pumping the cobalt salt solution and the sodium hydroxide solution prepared in the step (1) into a reaction vessel for a continuous reaction, wherein a pH value is controlled to be in a range of 10-12 by adjusting the flow rate of the sodium hydroxide solution, and a slurry particle size is controlled to be in a range of 15-20 microns; (3) obtaining cobalt hydroxide with good sphericity and crystallinity, washing and filtering, controlling a water content in a range of 10-30%, transferring into an oxidation reactor, and blowing air in for oxidation; and (4) placing the oxidized slurry into a blast oven for drying to obtain the large-grained spherical cobalt oxyhydroxide.

Description

technical field [0001] The invention relates to a preparation method of an inorganic material, in particular to a preparation method of cobalt oxyhydroxide. Background technique [0002] Since the 1980s, cobalt powder has been widely used in the field of rechargeable batteries as an activator for charging and discharging high-energy batteries. In the early 1990s, scientists from Japan, Germany and other countries successfully added sub-cobalt materials to battery raw materials, making it a high-value, high-tech product for the research and development of the battery industry. Cobalt compounds such as cobalt powder and cobalt oxide powder are used as a battery material additive with excellent performance, which can improve the Ni(OH) 2 Proton conductance, lower oxidation potential, increase oxygen evolution potential, have a significant effect on improving electrode performance. In the early stage of charging, it can ensure that the electrode is fully charged, so that Ni(OH...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04C01G51/00
Inventor 訚硕尹桂珍
Owner HUNAN YACHENG NEW MATERIAL CO LTD
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