Preparation method of cobalt oxide powder

A technology of cobalt oxide and powder materials, which is applied in the field of preparation of cobalt oxide powder, can solve problems that have not been reported, and achieve the effects of excellent electrochemical performance, uniform powder particle size distribution, and low production cost

Inactive Publication Date: 2011-03-30
LANZHOU JINCHUAN NEW MATERIAL SCI & TECH
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Problems solved by technology

At present, the industrial preparation of oxides, especially the application of cobalt oxide powder materials in the fields of lithium-ion battery cathode materials, fuel cells, catalysts, magnetic materials, and electronic ceramics, has not been reported.

Method used

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  • Preparation method of cobalt oxide powder
  • Preparation method of cobalt oxide powder
  • Preparation method of cobalt oxide powder

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preparation example Construction

[0021] A method for preparing cobalt oxide powder. In the preparation process, cobalt salt solution is atomized and then thermally decomposed at high temperature to obtain cobalt oxide powder material. The steps of the preparation process include:

[0022] 1) Ingredients: Cobalt salt solution (cobalt chloride, cobalt nitrate, cobalt sulfate) is prepared according to the cobalt concentration of 10-240g / L.

[0023] 2) Atomization: Atomize the solution in ingredient 1) into droplets of 0.5-100 μm.

[0024] 3) Pyrolysis: pyrolyze the liquid droplets obtained in 2) for 1-20 minutes at 400-1200°C and oxygen partial pressure of 1kPa-6kPa.

Embodiment 1

[0026] Add the cobalt chloride solution with a cobalt concentration of 100g / L into the liquid storage tank, and inject it into the pre-concentrator through a pressure pump to concentrate to 180g / L. The concentrated solution was atomized into 10 μm droplets by a pressure atomizer; the atomized droplets were heated in a heating furnace at 620° C. and an oxygen partial pressure of 2.5 kPa for 10 minutes. The obtained cobalt tetroxide has uniform particle size distribution, D50 is 3.46 μm, and bulk density is 0.69 g / cm 3 .

Embodiment 2

[0028] Add the cobalt chloride solution with a cobalt concentration of 100g / L into the liquid storage tank, and inject it into the pre-concentrator through a pressure pump to concentrate to 180g / L. The concentrated solution was atomized into 50 μm droplets through an air-flow atomizer. Heat the atomized droplets in a heating furnace for 10 minutes at a temperature of 650°C and an oxygen partial pressure of 2.5kPa. The obtained cobalt tetroxide has uniform particle size distribution, D50 is 9.03 μm, and bulk density is 0.90 g / cm 3 .

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Abstract

The invention discloses a preparation method of cobalt oxide powder and relates to a preparation method of the cobalt oxide powder in the fields of lithium ion battery cathode materials, fuel cells, catalysts, magnetic materials, electronic ceramics and the like. The method is characterized in that: solution of cobalt salt is atomized in the preparation process and thermally decomposed at a high temperature so as to obtain the cobalt oxide powder. In the method of the invention, the solution of cobalt salt serving as a raw material is atomized, the cobalt salt is thermally decomposed at a high temperature and under a controllable atmosphere so as to generate cobalt oxides (comprising cobalt monoxide CoO, cobaltosic oxide Co3O4 and cobalt sesquioxide Co2O3) and produced tail gas is absorbed to form regeneration acid. The method can further continuously realize a preparation process from solution to a cobalt oxide; and the particle size of the cobalt oxide powder prepared by the method is controllable in the range of between 0.2 and 20 microns and the cobalt oxide powder has uniform particle size distribution and high electrochemical performance. The preparation method saves energy, protects the environment and has low production cost and remarkable economic and social benefits.

Description

technical field [0001] A preparation method of cobalt oxide powder relates to a preparation method of cobalt oxide powder materials used in the fields of lithium ion battery cathode materials, fuel cells, catalysts, magnetic materials, electronics, ceramics and the like. Background technique [0002] Cobalt oxide powder materials include cobaltous oxide and cobalt trioxide, which are mainly used in lithium-ion battery cathode materials, fuel cells, catalysts, magnetic materials, electronics, ceramics and other fields. At present, the preparation method of cobalt oxide mainly adopts the chemical liquid phase method. The disadvantages are long process flow, high process control requirements, difficult control of impurities, inability to effectively guarantee the stability of product batches, and high environmental protection costs. [0003] The high-temperature pyrolysis pulverization process is an advanced topic in the field of powder production at home and abroad. At presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04
Inventor 闫忠强刘会基郭幸王红忠赫东波高红马科伟郭丹韩应举胡腊梅任祚承敬春梅路维华
Owner LANZHOU JINCHUAN NEW MATERIAL SCI & TECH
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