Preparation method of cobaltosic oxide for electric battery

A technology of tricobalt tetroxide and batteries, which is applied in the direction of cobalt oxide/cobalt hydroxide, etc., which can solve the problems of uneven distribution of particle size composition, increase of battery internal resistance, short discharge time, etc., and achieve the effects of good fluidity, reduced dosage, and uniform particle size

Active Publication Date: 2008-06-18
ZHEJIANG HUAYOU COBALT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, cobalt tetroxide produced by various methods has uneven distribution of particle size and composition, and small bulk density, which in turn causes defects such as small battery capacity and short discharge time. internal resistance
[0004] In addition, the particle size, sh...

Method used

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  • Preparation method of cobaltosic oxide for electric battery
  • Preparation method of cobaltosic oxide for electric battery
  • Preparation method of cobaltosic oxide for electric battery

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Using cobalt-containing ore as raw material, after leaching and purification, high-purity 50g / L-150g / L cobalt liquid is obtained, and ammonia water and polyvinylpyrrolidone (PVP) are added to the above-mentioned cobalt liquid according to 0.05%-10% of the cobalt mass. ), polyvinyl alcohol (PVA), cetyltrimethylammonium bromide (CTAB), polyethylene glycol PEG (1000), one or more of water-soluble starch (such as adding ammonia and polyethylene Glycol PEG1000), as complexed cobalt salt solution, selects a kind of in ammonium bicarbonate, ammonium carbonate as precipitant, after dissolving, filtering, be made into 80g / L-200g / L precipitant solution; Excessive 10%- 30% precipitant solution and complex cobalt salt solution are added to the reactor by co-current feeding method, the DCS distributed control system is used to control the reaction temperature at 30°C-90°C, the reaction pH value is 5.0-9.0, and the stirring speed is 400rpm-2000rpm , the precipitate of cobalt salt is ...

Embodiment 2

[0034] Using cobalt-containing ore as raw material, after leaching and purification, high-purity 50g / L-150g / L cobalt liquid is obtained, and ammonia water and polyvinylpyrrolidone (PVP) are added to the above-mentioned cobalt liquid according to 0.05%-10% of the cobalt mass. ), polyvinyl alcohol (PVA), cetyltrimethylammonium bromide (CTAB), polyethylene glycol PEG (1000), one or more of water-soluble starch (ammonia, polyvinylpyrrolidone PVP Add another kind of water-soluble starch), as complex cobalt salt solution, select a kind of in ammonium bicarbonate, ammonium carbonate as precipitation agent, after dissolving, filtering, be made into 80g / L-200g / L precipitation agent solution; Excessive 10%-30% precipitant solution and complex cobalt salt solution are added to the reactor by co-current feeding method, and the DCS distributed control system is used to control the reaction temperature at 30°C-90°C, the reaction pH value is 3.0-9.0, and the stirring speed For 400rpm-2000rpm...

Embodiment 3

[0036]Using cobalt-containing ore as raw material, after leaching and purification, high-purity 50g / L-150g / L cobalt liquid is obtained, and polyvinylpyrrolidone (PVP), One or more of polyvinyl alcohol (PVA), cetyltrimethylammonium bromide (CTAB), polyethylene glycol PEG (1000), water-soluble starch (ammonia, polyvinyl alcohol PVA or cetyl Alkyltrimethylammonium bromide (CTAB), as a complex cobalt salt solution, select one of ammonium bicarbonate and ammonium carbonate as a precipitant, and dissolve and filter to form an 80g / L-200g / L precipitant solution Add excess 10%-30% precipitant solution and complexed cobalt salt solution to the reactor by co-current feeding method, adopt DCS distributed control system to control the reaction temperature to 30°C-90°C, and the reaction pH value to 3.0-9.0, The stirring speed is 400rpm-2000rpm, and the precipitate of cobalt salt is continuously obtained as the precursor (its appearance is shown in Figure 5) by the complexation-homogeneous p...

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Abstract

The invention discloses a preparation method of Co3O4 for batteries, Co mineral is used as Co raw material, after purified the Co liquid is obtained, complexing-homogeneous sedimentation method is adopted to prepare precursor, i.e the Co liquid is prepared into the complexing Co salt solution, and then added with precipitator solution, the synthesis of the precursor is controlled to obtain single-dispersion sedimentation precursor so as to make the production and growth of the nucleation be separated, and then sintered under high temperature, the precursor is thermally decomposed to obtain the Co3O4 for batteries finally. The prepared Co3O4 powder has good flow property, even granularity and can utilize DCS system to adjust process parameters accurately to realize the control (D50=3um-6um,6um-9um,9um-12um), the tap density can reach 2.5g per cubic centimeter to 3.5g per cubic centimeter, microcosmic shape is single-crystal or like spherical, moreover the invention has the advantages of high chemical purity, good electrochemical performance, and no environmental pollution. The invention has simple process, stable product quality, low cost, and can adapt for the requirements of material performance and cost of various lithium cobalt oxide manufacturing factory.

Description

technical field [0001] The invention relates to a preparation method of tricobalt tetroxide, in particular to a preparation method of tricobalt tetroxide for lithium ion batteries. Background technique [0002] Cobalt tetroxide used in lithium-ion batteries not only has strict requirements on chemical composition, but also has particularly strict requirements on physical indicators. Its crystal structure should be dense spinel type, especially particle shape, particle size composition and distribution, and bulk density. There are strict requirements. It is generally required that tricobalt tetroxide is spherical or spherical, with uniform particle size distribution, and the typical particle size is D 50 =3μm~6μm or D 50 =6μm~9μm; the bulk density requirement is 0.6g / cm 3 ~1.2g / cm 3 Between, some users require up to 1.5g / cm 3 above. For large batteries used in power sources, the requirements for particle size and bulk density are more stringent due to safety performance...

Claims

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Application Information

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IPC IPC(8): C01G51/04
Inventor 俞建明刘秀庆金大庆
Owner ZHEJIANG HUAYOU COBALT
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