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Preparation method of nano cobalt oxide

A nano-cobalt oxide and cobalt salt technology, applied in nanostructure manufacturing, cobalt oxide/cobalt hydroxide, nanotechnology and other directions, can solve the problems of coarse cobalt oxide particle size, unfavorable for industrial production, uneven distribution, etc., and achieve cost Low, significant economic and social benefits, the effect of reducing the drying process

Inactive Publication Date: 2011-03-02
JIANGSU DONGXIN ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is difficult to oxidize completely because tricobalt tetroxide is difficult, and production cost is high, is unfavorable for industrial production
[0006] The patent "A Production Method for Subnanometer Cobalt Oxide" (CN 1931727A) proposes that the cobalt carbonate slurry and the cobalt oxalate slurry are mixed and then washed and roasted. Although this method is easy to wash and reduces impurities, the obtained oxide Cobalt particles have coarse particle size and uneven distribution

Method used

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  • Preparation method of nano cobalt oxide
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  • Preparation method of nano cobalt oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Use deionized water to prepare industrial-grade cobalt nitrate into a solution with a cobalt concentration of 60g / L. 4 HCO 3 Mixed with EDTA to form a saturated solution, the amount is Co:NH 4 HCO 3 :EDTA=1:2.3:0.1 (mole), add into the reaction vessel by co-current feeding method, control the feeding speed to 20ml / min, the synthesis reaction temperature is 60℃, the reaction pH value is 7.0, the stirring speed is 300rpm, the preparation For the precursor, the precursor is washed with 80℃ deionized water and dehydrated. The filter cake has a water content of 25%. It is directly filled into a bowl, placed in a calciner at a temperature of 250℃~600℃, calcined for 8h, crushed and classified to obtain oxidation Cobalt Co content 72.53%, loose density 0.32g / cm 3 , The average particle diameter is 160nm under the microscope of 20000 times. Its SEM image is as figure 1 Shown.

Embodiment 2

[0039] Use deionized water to prepare industrial-grade cobalt nitrate into a solution with a cobalt concentration of 80g / L. 4 HCO 3 And NH 3 ·H 2 O is made into a saturated solution, the amount is Co:NH 4 HCO 3 : NH 3 ·H 2 O=1:1.2:0.2 (mole), use co-current feeding method to add to the reaction vessel, control the feeding speed to 30ml / min, the synthesis reaction temperature is 70℃, the reaction pH value is 7.0, the stirring speed is 300rpm, the precursor is prepared The precursor is washed with 80°C deionized water and dehydrated. The filter cake has a water content of 25%. It is directly filled into a bowl, placed in a calciner at a temperature of 250°C to 600°C, calcined for 8 hours, crushed and classified to obtain cobalt oxide Co content 71.88%, bulk density 0.45g / cm 3 , The average particle diameter is 152nm under the microscope of 20000 times. Its SEM image is as figure 2 Shown.

Embodiment 3

[0041] Use deionized water to prepare industrial-grade cobalt nitrate into a solution with a cobalt concentration of 100g / L. 2 CO 3 Mixed with EDTA to form a saturated solution, the amount is Co:Na 2 CO 3 :OP=1:2.0:0.06 (mole), use co-current feeding method to add to the reaction vessel, control the feeding speed to 16ml / min, the synthesis reaction temperature is 80℃, the reaction pH value is 7.0, and the stirring speed is 300rpm. For the precursor, the precursor is washed with 80℃ deionized water and dehydrated. The filter cake has a water content of 25%. It is directly filled into a bowl, placed in a calciner at a temperature of 250℃~600℃, calcined for 8h, crushed and classified to obtain oxidation Cobalt Co content 72.36%, bulk density 0.38g / cm 3 , The average particle diameter is 183nm under the microscope at 20000 times. Its SEM image is as image 3 Shown.

[0042] Compared with the prior art, the present invention has the following advantages:

[0043] (1) The manufacturing...

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Abstract

The invention provides a preparation method of nano cobalt oxide, comprising the following steps: respectively preparing a cobalt raw material and precipitant into cobalt solution and precipitant solution by deionized water; adding the prepared cobalt solution with a certain concentration and the prepared precipitant solution with a certain concentration in accordance with a certain mole ratio toa reactor by using a parallel flow feed method; controlling the reaction temperature, the feed rate, the pH value and the stirring speed to prepare cobalt salt precursor; directly filling a water-containing filter cake into a bowl after washing and dehydrating; controlling the grain size and the crystal morphology through low-temperature dehydration, phase change calcination, mechanical pulverization and graded activation; and finally removing magnetic metallic foreign matters to obtain the nano cobalt oxide with high quality. The method is simple and easy to operate, has low cost, saves energy, is environmental friendly, and is applicable to industrial production; and the prepared cobalt oxide grains are fine and evenly distributed.

Description

Technical field [0001] The invention relates to a method for preparing cobalt oxide, in particular to a method for preparing nano cobalt oxide for lithium ion batteries. It belongs to the technical field of metal material preparation technology, inorganic chemicals and secondary rechargeable battery materials. Background technique [0002] Cobalt oxide has a wide range of applications in the fields of lithium ion batteries, glass, ceramics, cemented carbide, electronic materials, etc. Cobalt oxide is used as a raw material for lithium cobalt oxide and electronic pastes. Physical performance requirements such as diameter and distribution are relatively high. [0003] Lithium-ion batteries are popular because of their high voltage, high energy density, long cycle life, and low environmental pollution. In recent years, with the further growth in the demand for small portable power sources, a good opportunity has been created for the development of the lithium-ion battery industry. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04B82B3/00
CPCY02P20/10
Inventor 戴振华柏瑞芳丁一东
Owner JIANGSU DONGXIN ENERGY TECH
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