Method for preparing high purity nano cobalt hydroxide

A cobalt hydroxide, nano-scale technology, applied in the direction of cobalt oxide/cobalt hydroxide, nanostructure manufacturing, nanotechnology, etc., can solve the problems of phase analysis, the existence of impurity, irregular particles, and impure product purity, etc., to achieve Uniform particle size distribution, excellent fluidity, and large specific surface area

Inactive Publication Date: 2012-04-04
HAINAN JINYI NEW MATERIALS
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Problems solved by technology

The disadvantages of this method: First, there is no clear choice for cobalt salts, and the quality of cobalt hydroxide produced by different cobalt salts is very different, especially the removal of soluble sodium salts during washing, resulting in high and low impurity content in the product, which is extremely unstable The second is to adopt a one-step precipitation method without adding any additives. In addition to being unable to effectively control the particle size and shape of the crystals, and the particles are irregular, the product is prone to oxidative deterioration during drying, crushing, screening and other processing procedures. As a result, the purity of the product is impure, and there are impurities in the phase analysis, which is difficult to meet the practical application of this material in the battery industry

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  • Method for preparing high purity nano cobalt hydroxide

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Embodiment 1

[0026] Pre-prepared solutions: a cobalt sulfate aqueous solution with a concentration of 0.2mol / l, an aqueous solution of sodium hydroxide with a concentration of 3.0mol / l, an aqueous solution of a cobalt ion complexing agent with a concentration of 5.0mol / l, and an aqueous solution of reagent A with a concentration of 2.0mol / l Polyacrylamide aqueous solution, appropriate amount of additive aqueous solution. Then, the prepared cobalt sulfate aqueous solution, sodium hydroxide aqueous solution, cobalt ion complexing agent aqueous solution, and polyacrylamide aqueous solution are successively input into the reactor with stirring according to their flow ratios of 1:0.68:0.048:0.058. , control the reaction temperature to 20°C. Among them, the cobalt hydroxide suspension can be obtained after the reaction between the cobalt sulfate aqueous solution and the sodium hydroxide aqueous solution is complete, and its chemical reaction formula is CoSO 4 +2NaOH=Co(OH) 2 ↓+Na 2 SO 4 The ...

Embodiment 2

[0028] Pre-prepared solution: the cobalt sulfate aqueous solution with a concentration of 1.0mol / l, the aqueous sodium hydroxide solution with a concentration of 5.0mol / l, the cobalt ion complexing agent aqueous solution with a concentration of 7.5mol / l, and the aqueous solution of reagent A with a concentration of 6.5mol / l l of hydrazine hydrate solution, an appropriate amount of additive solution. The prepared cobalt sulfate aqueous solution, sodium hydroxide aqueous solution, cobalt ion complexing agent aqueous solution, and hydrazine hydrate aqueous solution are respectively successively input into the reactor with stirring according to their flow ratios of 1:0.70:0.050:0.060, and the control The reaction temperature was 35°C. Among them, the cobalt hydroxide suspension can be obtained after the reaction between the cobalt sulfate aqueous solution and the sodium hydroxide aqueous solution is complete, and its chemical reaction formula is CoSO 4 +2NaOH=Co(OH) 2 ↓+Na 2 SO...

Embodiment 3

[0030] Pre-prepared solution: a cobalt sulfate aqueous solution with a concentration of 1.5mol / l, an aqueous sodium hydroxide solution with a concentration of 8.0mol / l, an aqueous solution of a cobalt ion complexing agent with a concentration of 10.0mol / l, and an aqueous solution of reagent A with a concentration of 11.0mol / l l sodium borohydride aqueous solution, appropriate amount of additive aqueous solution. The prepared cobalt sulfate aqueous solution, sodium hydroxide aqueous solution, cobalt ion complexing agent aqueous solution, and sodium borohydride aqueous solution are respectively successively input into the reactor with stirring according to their flow ratios of 1:0.72:0.052:0.062, The reaction temperature was controlled to be 50°C. Among them, the cobalt hydroxide suspension can be obtained after the reaction between the cobalt sulfate aqueous solution and the sodium hydroxide aqueous solution is complete, and its chemical reaction formula is CoSO 4 +2NaOH=Co(OH...

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Abstract

The invention discloses a method for preparing high purity nano cobalt hydroxide, belonging to the technical field of battery energy material preparation. Homogeneous phase precipitation method is adopted to synthesize cobalt hydroxide, including that: cobaltous sulphate aqueous solution, sodium hydroxide aqueous solution, cobalt ion chelating agent aqueous solution and aqueous solution of reagent A which are in certain concentration are respectively, sequentially and continuously added into a reactor to be stirred according to flow ratio of 1: 0.68-0.74: 0.048-0.054: 0.058-0.064, reaction is taken place, appropriate amount of additive aqueous solution is added, and ageing, solid-liquid separation, washing and drying are carried out, thus obtaining the high purity nano cobalt hydroxide product. The product not only has high purity, regular shape, small grain size and uniform distribution, but also has high specific area, higher bulk density and good liquidity, dispersity and workability, thus being beneficial to separate processing or uniformly coating cobalt hydroxide on the surface of nickel hydroxide particle by adopting chemical plating, so that combination property of nickel-hydrogen battery is improved.

Description

technical field [0001] The invention belongs to the technical field of battery material preparation, and in particular relates to a preparation method of high-purity nano-scale cobalt hydroxide. Background technique [0002] With the continuous development of my country's economy and technology, the use of energy has also increased, especially the rapid development of industry, which consumes a lot of battery energy, and the harmful substances produced are likely to cause damage to the ecological environment. Therefore, the country puts forward higher requirements on the use of energy, not only to improve the efficiency of energy use, but also to achieve energy conservation and emission reduction, and to strengthen the protection of the natural ecological environment. Therefore, it is extremely important to improve the structure of battery energy equipment, especially the preparation of high-purity battery energy materials. [0003] The anode material of nickel-hydrogen bat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/04B82B3/00
Inventor 姚瑞竹张旭付春平黎永忠赵蜀南
Owner HAINAN JINYI NEW MATERIALS
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