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Preparation method of large-particle spherical cobaltosic oxide

A technology of tricobalt tetroxide and large particles, which is applied in the direction of cobalt oxide/cobalt hydroxide, etc., can solve the problems of insufficient sphericity, reaction, and low energy density of lithium-ion secondary batteries, so as to improve energy density, performance, and energy density high effect

Inactive Publication Date: 2014-04-30
CHANGZHOU POWERGENIE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the cobalt oxide lithium electrode prepared by the lithium cobalt oxide electrode has low energy density and is easy to mix with the electrolyte due to insufficient sphericity and small particle size of the cobalt tetraoxide for batteries prepared by the precipitation-thermal decomposition method in the prior art. A reaction occurs between them, which leads to the problems of low energy density of the prepared lithium-ion secondary battery and easy consumption of electrode materials; and then proposes a preparation of large-particle spherical cobalt trioxide that improves the energy density of lithium-ion secondary batteries and reduces the consumption of electrode materials method

Method used

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Examples

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Effect test

Embodiment 1

[0027] (1) Prepare 1.0mol / L cobalt sulfate (CoSO 4 ) aqueous solution;

[0028] (2) Prepare 4.0mol / L sodium hydroxide aqueous solution;

[0029] (3) Prepare a mixed solution of ethylenediamine and hydrazine hydrate with deionized water, and the mixed solution contains 0.3mol / L ethylenediamine and 0.05mol / L hydrazine hydrate;

[0030] (4) The above cobalt sulfate (CoSO 4 ) solution, sodium hydroxide solution and mixed solution were added to the reaction kettle at a flow rate of 250L / h, 100L / h and 50L / h respectively, the reaction temperature was controlled at 40°C, the reaction pH was 9, and the stirring speed was 700rpm / min, react for 12h to prepare the precursor;

[0031] (5) The above precursor was washed with deionized water, filtered, and then calcined at 800°C for 6 hours to obtain tricobalt tetroxide A.

Embodiment 2

[0033] (1) Prepare 1.0mol / L cobalt chloride (CoCl 2 ) aqueous solution;

[0034] (2) Prepare 5.0mol / L sodium hydroxide aqueous solution;

[0035] (3) Prepare a mixed solution of EDTA and sodium thiosulfate with deionized water, the mixed solution contains 0.5mol / L of EDTA and 0.1mol / L of sodium thiosulfate;

[0036] (4) The above cobalt chloride (CoCl 2 ) solution, potassium hydroxide solution and mixed solution were added to the reaction kettle at a flow rate of 150L / h, 150L / h and 40L / h respectively, the reaction temperature was controlled at 50°C, the reaction pH was 10, and the stirring speed was 900rpm / min, reacted for 13h to prepare the precursor;

[0037] (5) The above precursor was washed with deionized water, filtered, and then calcined at 800°C for 5 hours to obtain tricobalt tetroxide B.

Embodiment 3

[0039] (1) Prepare 2.0mol / L cobalt sulfate (CoSO 4 ) aqueous solution;

[0040] (2) Prepare 6.0mol / L potassium hydroxide aqueous solution;

[0041] (3) Prepare tartaric acid and hydrazine hydrate with deionized water to prepare a mixed solution containing 1.0 mol / L tartaric acid and 0.15 mol / L hydrazine hydrate;

[0042] (4) The above cobalt sulfate (CoSO 4 ) solution, potassium hydroxide solution and mixed solution were added to the reaction kettle at a flow rate of 100L / h, 120L / h and 30L / h respectively, the reaction temperature was controlled at 60°C, the reaction pH was 11, and the stirring speed was 1000rpm / min, react for 14h to prepare the precursor;

[0043](5) The above precursor was washed with deionized water, filtered, and then calcined at 700°C for 4 hours to obtain tricobalt tetroxide C.

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Abstract

The invention discloses a preparation method of large-particle spherical cobaltosic oxide. The preparation method comprises the following steps: mixing a complexing agent with a reducing agent to prepare a mixed solution; stirring and mixing a cobalt salt solution, a precipitator solution and the mixed solution at a pH value of 9-12 at 40-70 degrees centigrade by a stirring speed of 700-1500 r / min to obtain a precursor; washing and filtering the precursor, then roasting at 500-800 degrees centigrade for 3-6 hours, and thus obtaining large-particle spherical cobaltosic oxide. Cobaltosic oxide prepared by the method disclosed by the invention has a high degree of sphericity as well as high particle diameter and high tap density, and cobaltosic oxide is suitable for manufacturing a lithium cobalt oxide electrode material, therefore, a lithium ion battery prepared from the lithium cobalt oxide electrode has large energy density and high performance.

Description

technical field [0001] The invention relates to a method for preparing large-particle spherical cobalt tetroxide, which belongs to the technical field of cobalt oxide preparation. Background technique [0002] Tricobalt tetroxide is the main raw material for preparing lithium cobalt oxide, the cathode material of lithium ion secondary batteries. For a long time, researchers have been working on the preparation of spherical large particles of cobalt tetroxide as electrode raw materials. This is due to the fact that the lithium cobalt oxide particles prepared by large particles of cobalt oxide have a large particle size and a small specific surface area. The contact area is small, and oxidation-reduction reaction is not easy to occur, thereby reducing the consumption of electrode materials; moreover, the lithium cobaltate obtained from spherical tricobalt tetroxide is spherical or quasi-spherical particles, and the tap density and compaction of lithium cobaltate particles in t...

Claims

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Application Information

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IPC IPC(8): C01G51/04
Inventor 龚黎明杨志张美杰王丽娟丁文成
Owner CHANGZHOU POWERGENIE MATERIALS
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