Method for producing nanoscale cobalt (II) oxide

A cobalt oxide, nano-scale technology, applied in the field of metal powder production, can solve the problems of short service life of secondary batteries, long charging time of secondary batteries, uneven particle size, etc., so as to achieve short charging time and prolong service life. , the effect of narrow particle size distribution

Inactive Publication Date: 2015-11-25
WUXI ZHONGJING METAL POWDER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the above-mentioned cobaltous oxide is made from cobalt ore through steps such as acid dissolution, extraction, synthesis, and calcination, the particle size of the produced cobaltous oxide is between 1 and 10 microns, the particle size distribution is wide, and the particle size is uneven. poor dispersion
Using this cobaltous oxide as the positive electrode material of the secondary battery makes the secondary battery produced have a longer charging time, especially at a low temperature of minus 40°C, the charge and discharge capacity of the secondary battery can only reach 60~70%, making Secondary batteries don't last long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Prepare the following ingredients first:

[0025] Cobalt nitrate crystals, 150L of ammonia water with a concentration of 180g / L, 1800L of sodium hydroxide with a concentration of 130g / L and 10% dilute ammonia water;

[0026] Then, add deionized water with a temperature of 30° C. into the liquid tank, and slowly add cobalt nitrate crystals while stirring, and dissolve the cobalt nitrate crystals. When the concentration of cobalt reaches 100g / L, adding concentration is 10% dilute ammonia water and adjusts its pH value to 4.2, obtains cobalt nitrate solution;

[0027] After that, take 1000L of the above-mentioned cobalt nitrate solution and add it into the reaction kettle, and heat it to 33°C. While stirring evenly, slowly add 150L of the above-mentioned ammonia water with a concentration of 180g / L into 1000L of the above-mentioned nitric acid within 2.2 hours by spraying. In the cobalt solution, the first mixed solution is obtained;

[0028] Afterwards, the 1800L sodium...

Embodiment 2

[0038] Prepare the following ingredients first:

[0039] Cobalt nitrate crystals, 150L of ammonia water with a concentration of 180g / L, 1800L of sodium hydroxide with a concentration of 130g / L and 10% dilute ammonia water;

[0040] Then, add deionized water with a temperature of 35° C. into the liquid tank, and slowly add cobalt nitrate crystals while stirring, and dissolve the cobalt nitrate crystals. When the concentration of cobalt reaches 100g / L, adding concentration is 10% dilute ammonia water and adjusts its pH value to 4.5, obtains cobalt nitrate solution;

[0041] After that, take 1000L of the above-mentioned cobalt nitrate solution and add it into the reaction kettle, and heat it to 35°C. While stirring evenly, slowly add 150L of the above-mentioned ammonia water with a concentration of 180g / L into 1000L of the above-mentioned nitric acid within 2.5 hours by spraying method. In the cobalt solution, the first mixed solution is obtained;

[0042] Afterwards, the 1800L...

Embodiment 3

[0052] Prepare the following ingredients first:

[0053] Cobalt nitrate crystals, 150L of ammonia water with a concentration of 180g / L, 1800L of sodium hydroxide with a concentration of 130g / L and 10% dilute ammonia water;

[0054] Then, add deionized water at a temperature of 25° C. into the liquid tank, and slowly add cobalt nitrate crystals while stirring, and dissolve the cobalt nitrate crystals. When the concentration of cobalt reaches 100g / L, adding concentration is 10% dilute ammonia water and adjusts its pH value to 4, obtains cobalt nitrate solution;

[0055] After that, take 1000L of the above-mentioned cobalt nitrate solution and add it into the reaction kettle, and heat it to 30°C. While stirring evenly, slowly add 150L of the above-mentioned ammonia water with a concentration of 180g / L into 1000L of the above-mentioned nitric acid within 2 hours by spraying method. In the cobalt solution, the first mixed solution is obtained;

[0056] Afterwards, the 1800L sodiu...

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Abstract

The invention discloses a method for producing nanoscale cobalt (II) oxide, particularly a production method of cobalt (II) oxide used as a cathode material of secondary batteries. The nanoscale cobalt (II) oxide is prepared from raw materials including cobalt nitrate crystals, 150 L of aqueous ammonia with the concentration of 180 g / L, 1800 L of sodium hydroxide with the concentration of 130 g / L, dilute aqueous ammonia with the concentration of 10%, and the like through the steps of dilution, dissolution, synthesis, deposition, filtration, slurrying, washing, drying, semi-reduction decomposition under the positive pressure atmosphere, passivation through inert gases, sieving and the like. The prepared nanoscale cobalt (II) oxide with the particle size being only 0.1-0.5 micron is relatively narrow in particle size distribution, uniform in particle size and good in dispersion effect. The secondary batteries produced through adopting the cobalt (II) oxide as the cathode material of secondary batteries is relatively short in charging time, and particularly, the charge and discharge capacity of the secondary batteries reaches up to 90% at the low temperature of minus 40 DEG C, so that the service life of the secondary batteries is relatively long.

Description

technical field [0001] The present invention relates to a method of producing metal powder. Specifically, it is a production method of cobaltous oxide as a secondary battery positive electrode material. Background technique [0002] It is known in the battery production industry that cobaltous oxide has been widely used as the positive electrode material of nickel-metal hydride batteries, nickel-cadmium batteries and capacitor batteries. The cobaltous oxide is mostly extracted with cobalt ore to obtain cobalt sulfate or cobalt oxide, and the cobalt sulfate or cobalt oxide is synthesized with ammonium bicarbonate to obtain basic cobalt carbonate. It is then made by calcining basic cobalt carbonate. Since the above-mentioned cobaltous oxide is made from cobalt ore through steps such as acid dissolution, extraction, synthesis, and calcination, the particle size of the produced cobaltous oxide is between 1 and 10 microns, the particle size distribution is wide, and the particl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04B82Y30/00
Inventor 高峰冯斌
Owner WUXI ZHONGJING METAL POWDER
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