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Method for preparing cobalt clad beta-NiOOH by liquid phase oxidation method

A liquid-phase oxidation method and cobalt-coated technology, which is applied to electrical components, battery electrodes, circuits, etc., can solve the problems of irreversible electrodes, low conversion rate, and low conversion rate of β-NiOOH, so as to improve cycle life and discharge platform , the effect of easy quality control

Active Publication Date: 2011-05-04
LIAONING JIUYI ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The operating conditions of the solid-phase chemical oxidation method are harsh, and the reactants are not easy to disperse evenly, so that the reaction is not thorough enough and the conversion rate is low
The liquid phase chemical oxidation method has the characteristics of short reaction time, simple operation, and is conducive to the realization of industrial operation, but there are the following problems in practical application: ① It is easy to generate NiOOH with different crystal structures, namely β-NiOOH and γ-NiOOH, so β -The conversion rate of -NiOOH is low; ②Because γ-NiOOH is irreversible, the electrode is also irreversible, making it impossible to apply in secondary batteries; ③The generated β-NiOOH is ordinary spherical β-NiOOH, this material is used in secondary batteries When in the battery, the reversibility is poor, and it is impossible to make a secondary battery with excellent electrochemical performance

Method used

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  • Method for preparing cobalt clad beta-NiOOH by liquid phase oxidation method
  • Method for preparing cobalt clad beta-NiOOH by liquid phase oxidation method
  • Method for preparing cobalt clad beta-NiOOH by liquid phase oxidation method

Examples

Experimental program
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Embodiment 1

[0016] Example 1 Preparation of cobalt-coated β-NiOOH by liquid phase oxidation

[0017] At room temperature, dissolve 800g (20mol) NaOH in 2000g deionized water, add 1483g (16mol) cobalt-coated Ni(OH) 2 (commercially available, Co / Ni=5.4%) mixed and stirred, keeping the temperature at 25°C, adding 2143g (9mol) Na 2 S 2 o 8 , heat up to 60°C±5°C and keep warm, stir rapidly for 3h, then let the reaction solution stand for 0.5h, separate layers, remove the upper clear liquid, add 2000ml of water, continue stirring for 0.5h, stand still, separate layers, remove the supernatant , add 700ml of water in three times, wash and vacuumize, and dry the precipitate at 80°C for 2h to obtain the product.

[0018] The starting material is coated with cobalt Ni(OH) 2 And product is done ICP test and XRD pattern, the results are shown in Table 1 and figure 1 .

[0019] Table 1 Starting material cobalt-coated Ni(OH) 2 And the ICP (Co / Ni) results of the product

[0020]

...

Embodiment 2

[0023] Example 2 Preparation of cobalt-coated β-NiOOH by liquid phase oxidation

[0024] At room temperature, dissolve 800g (20mol) NaOH in 2000g deionized water, add 1330g (14mol) cobalt-coated Ni(OH) 2 (commercially available, Co / Ni=4.8%) mixed and stirred, keeping the temperature at 15°C, adding 1892g (7mol) K 2 S 2 o 8 , raise the temperature to 45°C±5°C and keep it warm, stir rapidly for 2h, then let the reaction solution stand for 1h, separate layers, remove the clear liquid in the upper layer, add 1000ml of water, continue stirring for 0.5h, stand still, separate layers, remove the supernatant, Add 400ml of water in three times, wash and vacuumize, and dry the precipitate at 80°C for 2h to obtain the product.

[0025] The starting material is coated with cobalt Ni(OH) 2 And the product is tested by ICP, the result shows that Co / Ni=4.8% in the product, which is the same as the starting material coated with cobalt Ni(OH) 2 The Co / Ni are the same, and the product is d...

Embodiment 3

[0027] Example 3 Preparation of cobalt-coated β-NiOOH by liquid phase oxidation

[0028] At room temperature, dissolve 800g (20mol) NaOH in 2000g deionized water, add 1854g (20mol) cobalt-coated Ni(OH) 2 (commercially available, Co / Ni=6.0%) mixed and stirred, keeping the temperature at 45°C, adding 2857g (12mol) Na 2 S 2 o 8 , raise the temperature to 80°C±5°C and keep it warm, stir rapidly for 1h, then let the reaction solution stand for 0.5h, separate layers, remove the upper clear liquid, add 3000ml of water, continue stirring for 0.5h, stand still, separate layers, remove the supernatant , add water for a total of 950ml three times, wash and vacuumize, and dry the precipitate at 80°C for 2h to obtain the product.

[0029] The starting material is coated with cobalt Ni(OH) 2 And the product is tested by ICP, the result shows that Co / Ni=6.0% in the product, which is the same as the starting material coated with cobalt Ni(OH) 2 The Co / Ni are the same, so it is determine...

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Abstract

The invention relates to a method for preparing cobalt clad beta-NiOOH by a liquid phase oxidation method. In the technical scheme of the invention, the method for preparing the cobalt clad beta-NiOOH by the liquid phase oxidation method comprises the following steps of: preparing a NaOH aqueous solution, adding cobalt clad Ni(OH)2 and evenly stirring; adding an oxidizing agent at the temperature of 15-45 DEG C, stirring for 1-3h at the temperature of 40-85 DEG C, and standing for 0.5-1h; removing supernatant liquid; precipitating and washing; and drying. The molar ratio of the NaOH to the cobalt clad Ni(OH)2 to the oxidizing agent is 1: (0.7-1.0): (0.35-0.6). The method is simple to operate and improves the oxidizability of the Ni(OH)2, and the percent conversion of the cobalt clad beta-NiOOH is at least 95 percent; the cobalt clad beta-NiOOH prepared by the method is used as a secondary battery nickel electrode additive, and a manufactured secondary battery discharge plateau is high and has long cycle life.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, and in particular relates to a method for preparing cobalt-coated β-NiOOH by a liquid-phase oxidation method. Background technique [0002] Nickel electrodes are widely used in Cd-Ni, MH-Ni and Zn-Ni batteries. In recent years, with the development of science and technology, in order to meet the new and higher requirements for chemical power sources in many fields, nickel electrodes and their series of batteries have attracted people's attention, so a lot of research has been done on the material structure and performance of nickel electrodes. research and improvement work. [0003] Nickel oxyhydroxide (NiOOH) is often used as a material for the preparation of nickel cathodes. The current methods for synthesizing NiOOH include electrolytic oxidation and chemical oxidation (gas phase, liquid phase, and solid phase). The electrolytic oxidation method has many steps, long production time and high...

Claims

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Application Information

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IPC IPC(8): C01G53/02H01M4/52
CPCY02E60/10
Inventor 庞柳萍陈喜娥叶丹
Owner LIAONING JIUYI ENERGY TECH
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