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Method for preparing spherical cobaltous oxide

A spherical cobaltous oxide technology, which is applied in the field of preparation of cobaltous oxide, can solve the problems of affecting the later discharge performance of the battery, rough particle surface, poor oxidation resistance, etc., so as to avoid errors, smooth particle surface and strong oxidation resistance Effect

Active Publication Date: 2008-05-21
ZHEJIANG HUAYOU COBALT
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Problems solved by technology

Cobaltous oxide with an amorphous structure has poor oxidation resistance due to its rough particle surface and large surface area
Chinese patent CN1321795 adopts electrolytic method to prepare the cobaltous oxide whose composition is CoO·Co x , although the presence of some pure cobalt is beneficial to oxidation resistance, it will affect the later discharge performance of the battery

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  • Method for preparing spherical cobaltous oxide
  • Method for preparing spherical cobaltous oxide

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Embodiment 1

[0030] As shown in Figure 1, a method for preparing spherical cobaltous oxide described in this example uses cobalt-containing ore as a raw material, and after leaching and purification, a high-purity 5g / L-50g / L cobalt liquid is obtained, which is supplied to the above-mentioned Add ammonia water, polyvinylpyrrolidone (PVP), polyvinyl alcohol (PVA), cetyltrimethylammonium bromide (CTAB), polyethylene glycol PEG ( 1000), one or more of water-soluble starch, as a complex cobalt salt solution, select one of ammonium bicarbonate, ammonium carbonate, sodium carbonate or sodium hydroxide as a precipitant, and dissolve and filter to form 10g / L-100g / L precipitant solution; add excess 10%-30% precipitant solution and complex cobalt salt solution to the reactor by co-current feeding method, and control the reaction temperature to 30°C through the DCS distributed control system device -90°C, the reaction pH value is 3.0-9.0, the stirring speed is 400rpm-3000rpm, and the cobalt salt preci...

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Abstract

The invention discloses a preparation method of spherical cobaltous oxide, and relates to cobalt solution which is obtained by the leaching and purification of cobalt ore that is used as cobalt raw material. The invention is characterized in that a precursor is prepared by a complexing-homogeneous precipitation method, that is the cobalt solution is made into complexing cobalt salt solution whichis then added with precipitator solution, thereby, the precipitate precursor is formed by controlling the synthesis of the precursor; the spherical cobaltous oxide is obtained by the thermal decomposition of the precursor at 300 to 550 degrees under inert or slight reducing gas atmosphere; and then spherical cobaltous oxide of the invention is formed through the associated passivation of the obtained spherical cobaltous oxide by using gas passivator and liquid passivator, and heat seal packing. The cobaltous oxide powder which is obtained by adopting the method of the invention has the advantages of high activity, high purity, uniform particle size, centralized distribution, smooth surface of particles and strong inoxidability, etc. The invention has easy technology flow, stable production quality, low cost, high automation, thereby being applicable to the large-scale industrialized production.

Description

technical field [0001] The invention relates to the preparation of cobaltous oxide, in particular to a method for preparing spherical cobaltous oxide. Background technique [0002] Cobaltous oxide is an important anode filler for Ni / Cd and Ni / MH batteries. In batteries, Co 2+ Ions can enter the layer of nickel hydroxide to improve the performance of nickel hydroxide and obtain an electrode material with high charging efficiency, such as Chinese patent CN1173855. As an important part of electrode materials, cobaltous oxide is generally required to have good reactivity and high purity. [0003] At present, the powder of cobaltous oxide products on the market is basically an amorphous structure, in the form of agglomerates, with different particle sizes and non-concentrated particle size distribution. Such powders are not conducive to the uniformity of the mixture during the battery manufacturing process, which may lead to component segregation and inconsistency in battery pe...

Claims

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Application Information

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IPC IPC(8): C01G51/04H01M4/52
CPCY02E60/12Y02E60/10
Inventor 刘舒文刘秀庆金大庆向波
Owner ZHEJIANG HUAYOU COBALT
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