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Preparation of doped cobaltic-cobaltous oxide

A technology of tricobalt tetroxide and cobalt hydroxide, which is applied in the field of preparation of doped tricobalt tetroxide to achieve good fluidity, stability and electrochemical performance

Inactive Publication Date: 2008-10-08
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adding a certain amount of magnesium, aluminum, titanium and other elements, the cycle life and electrochemical performance of lithium-ion batteries can be improved. At present, there is no such doped cobalt tetroxide product in China.

Method used

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  • Preparation of doped cobaltic-cobaltous oxide
  • Preparation of doped cobaltic-cobaltous oxide
  • Preparation of doped cobaltic-cobaltous oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0015] 1) preparation contains the cobalt nitrate solution of doping element ion, and the cobalt concentration in the solution is 80g / L, and the content of doping element magnesium is 0.06g / L; Ammonia is added in sodium hydroxide solution to make precipitant solution, and its precipitant Sodium hydroxide content is 100g / L in the solution, and ammoniacal liquor content is 20g / L.

[0016] 2) The cobalt nitrate solution containing the doping element ions and the precipitating agent solution are added to the reactor in a co-current manner to react, and the co-current volume ratio of the cobalt nitrate solution containing the doping element ions and the precipitating agent solution is 1: (1.1-1.3), the reaction pH value is 8.0-10.0, the reaction temperature is 60°C, and the reaction time is 10h.

[0017] 3) The reactant cobalt hydroxide was washed with pure water and then dried at 80°C; calcined at 650°C for three hours in an air atmosphere, and cooled in a furnace to obtain black ...

Embodiment 2

[0027] 1) preparation contains the cobalt nitrate solution of doping element ion, and in the solution, cobalt concentration is 80g / L, and doping element magnesium content is 0.17g / L; Ammonia is added in sodium hydroxide solution to make precipitant solution, and its precipitant Sodium hydroxide content is 100g / L in the solution, and ammoniacal liquor content is 20g / L.

[0028] 2) The cobalt nitrate solution containing the doping element ions and the precipitating agent solution are added to the reactor in a co-current manner to react, and the co-current volume ratio of the cobalt nitrate solution containing the doping element ions and the precipitating agent solution is 1: (1.1~1.3), the reaction pH value is 8.0-10.0, the reaction temperature is 60°C, and the reaction time is 10h.

[0029] 3) The reactant cobalt hydroxide was washed with pure water and dried at 80°C; calcined at 650°C for three hours in an air atmosphere, and cooled in a furnace to obtain black doped tricobalt...

Embodiment 3

[0039] 1) preparation contains the cobalt nitrate solution of doping element ion, and in the solution, cobalt concentration is 80g / L, and doping element aluminum content is 0.05g / L; Ammonia is added in sodium hydroxide solution to make precipitant solution, and its precipitant Sodium hydroxide content is 100g / L in the solution, and ammoniacal liquor content is 20g / L.

[0040] 2) The cobalt nitrate solution containing the doping element ions and the precipitating agent solution are added to the reactor in a co-current manner to react, and the co-current volume ratio of the cobalt nitrate solution containing the doping element ions and the precipitating agent solution is 1: (1.1~1.3), the reaction pH value is 8.0-10.0, the reaction temperature is 60°C, and the reaction time is 10h.

[0041] 3) The reactant cobalt hydroxide was washed with pure water and then dried at 80°C; calcined at 650°C for three hours in an air atmosphere, and cooled in a furnace to obtain black doped trico...

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Abstract

Disclosed is a process for preparing a doping cobaltosic oxide, which relates to a method for the production of a modified cobaltosic oxide used for a Lithium-ion battery anode material. The method is characterized in that the preparation process comprises: 1) mixing a cobalt nitrate solution containing doped chemical ions with a mixed precipitator solution containing ammonia and sodium hydroxide and making the mixture react for eight to twenty hours at a pH value of between 8.4 to 10 and a temperature of between 40 and 80 DEG C so as to prepare a cobalt hydroxide precipitation containing doped chemical; and 2) washing and drying the cobalt hydroxide precipitation containing the doped chemical and then burning the precipitation for two to six hours at a temperature of between 500 and 800 DEG C so as to obtain the doping cobaltosic oxide. The method of the invention can get even particles with regular shapes after the reaction, the particle sizes of the doping cobalt hydroxide are controllable in a certain range, and the doping cobaltosic oxide can be obtained by calcinations. The method of preparation is characterized in that a magnesium source, an aluminum source, a titanium source, etc. are induced to the cobalt nitrate solution directly, and the process and operation are simple and easy.

Description

technical field [0001] The invention discloses a preparation method of doped tricobalt tetroxide, which relates to a preparation method of modified tricobalt tetroxide used for lithium-ion battery cathode materials. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, large specific capacity, safety and environmental protection, and have attracted widespread attention. Lithium cobaltate is the most commonly used material in lithium-ion battery cathode materials, and tricobalt tetroxide is an important material for preparing lithium cobaltate. By doping a certain amount of magnesium, aluminum, titanium and other elements, the cycle life and electrochemical performance of lithium-ion batteries can be improved. At present, there is no such doped cobalt tetroxide product in China. Contents of the invention [0003] The object of the present invention is to address the shortcomings of the above-mentioned prior art, and provide a preparation ...

Claims

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Application Information

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IPC IPC(8): C01G51/04
Inventor 李永军武浚刘会基贺建军高小琴刘进才
Owner JINCHUAN GROUP LIMITED
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