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Nano grade nickel oxyhydroxide and process for preparing same

A nickel oxyhydroxide, nano-scale technology, applied in nickel oxide/nickel hydroxide, nickel carbonyl, electrical components, etc., can solve the problems of high self-discharge rate, low discharge capacity, low product conversion rate, etc., to prevent growth Effect with agglomeration, high discharge specific capacity, high discharge specific capacity

Inactive Publication Date: 2003-08-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the β-NiOOH produced by this method still has the following problems: (1) The solid phase grinding reaction method is used to grind the reactants, because the diffusion and movement of the reactant particles are severely restricted, so that various The reactants are more difficult to disperse evenly, and the particles are easy to agglomerate and grow up, which causes the reaction to be carried out insufficiently. The conversion rate of the reaction product nano-scale nickel oxyhydroxide (β-NiOOH) is low, and the quality is difficult to guarantee; (2) Ammonium persulfate is used as The solid-phase chemical reaction of the oxidant is incomplete and incomplete at room temperature, and the oxidation performance of ammonium persulfate is not strong enough, so that the obtained nano-scale nickel oxyhydroxide (β-NiOOH) is made into an alkaline Zn / NiOOH secondary battery After the initial discharge capacity is very low
(3) The reaction is not thorough enough when the method prepares nickel oxyhydroxide, and the conversion rate of the product is low, when the nickel oxyhydroxide product and metal zinc powder are used to assemble a battery, the initial discharge specific capacity of the battery is very low
Therefore, the nickel oxyhydroxide product is not suitable for use as the positive electrode active material of a zinc-nickel battery
(4) The layered crystal structure of the nano-scale nickel oxyhydroxide is not doped with alkali metal cations, so that its self-discharge rate is relatively large and its storage performance is relatively poor.
(5) The production technique of this method is difficult to carry out large-scale industrialized production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh an appropriate amount of nickel chloride (NiCl2 ·6H 2 O) be dissolved in tap water and be prepared into 100ml solution, so that the concentration of the solution is 0.1M. Add cobalt chloride which is 1% by weight relative to nickel chloride therein, dissolve and mix uniformly to prepare a reaction solution.

[0024] Measure 200ml of tap water, then add it to 300ml of sodium hypochlorite aqueous solution to prepare 500ml of oxidant aqueous solution, and control the concentration of sodium hypochlorite aqueous solution to 5M.

[0025] Put 500ml of the above-mentioned oxidant aqueous solution on an ultrasonic reactor for ultrasonic vibration dispersion, and heat to 45°C, and then add 100ml of the above-mentioned reaction solution dropwise. After the reaction solution is added, continue to carry out the ultrasonic vibration dispersion reaction. The reaction time was 0.5 hours. The obtained reaction product nickel oxyhydroxide was in the form of black sol.

[0026]...

Embodiment 2

[0031] Weigh an appropriate amount of nickel sulfate (NiSO 4 ·7H 2 O) dissolved in distilled water to prepare 100ml aqueous solution. The concentration of the aqueous solution is 12M. Add 1% cobalt sulfate and 4% cadmium chloride relative to the nickel sulfate to the nickel sulfate, dissolve and mix uniformly to form a reaction solution.

[0032] Weigh an appropriate amount of sodium hydroxide and dissolve it in distilled water to prepare 167ml of alkaline aqueous solution. The concentration of the aqueous solution is 14M. Then will be added to 333ml sodium hypochlorite aqueous solution and be mixed with oxidant aqueous solution 500ml. The concentration of the sodium hypochlorite aqueous solution was 1M.

[0033] Put 500ml of the above-mentioned oxidant aqueous solution on an ultrasonic reactor for ultrasonic vibration dispersion, and heat to 65°C, and then add 100ml of the above-mentioned reaction solution dropwise. After the reaction solution is added, continue to carr...

Embodiment 3

[0039] Weigh an appropriate amount of nickel nitrate (NiNO 3 ·6H 2 O) be dissolved in deionized water and be mixed with 100ml aqueous solution. The concentration of the aqueous solution is 5M. Add 5% cobalt chloride relative to the nickel nitrate and 2% zinc chloride relative to the nickel nitrate, dissolve and mix uniformly to form a reaction solution.

[0040] Take an appropriate amount of potassium hydroxide and dissolve it in deionized water to prepare 50 ml of alkaline aqueous solution, the concentration of the aqueous solution is 12M. Then it was added to 450ml of sodium hypochlorite aqueous solution to be mixed with 500ml of oxidizing agent aqueous solution. The concentration of the sodium hypochlorite aqueous solution was 3M.

[0041] Put 500ml of the above-mentioned oxidant aqueous solution on an ultrasonic reactor for ultrasonic vibration dispersion, and heat to 55°C, and then add 100ml of the above-mentioned reaction solution dropwise. After the reaction soluti...

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Abstract

The present invention relates to the field of cell material, in particular, it relates to a method for preparing positive material nickel oxyhydroxide for zinc-nickel primary cell, zinc-nickel secondary cell and other cells using compound of nickel as active matter, such as cadmium-nickel cell, metal hydride nickel cell and Hawkins cell and nano grade nickel oxyhydroxide prepared by said method. The nano nickel oxyhydroxide is prepared by using nickeous salt as raw material, using sodium hypochlorite as oxidant; adopting precipitation reaction and oxidation reaction simultaneously in alkalineaqueous solution and adopting ultrasonic wave to make oscillation dispersion in the course of reaction. Said invented product is fine and uniform in grain size, large in specific surface area, high in initial discharge specific value, low in self-discharge rate and stable in electric performance.

Description

(1) Technical field [0001] The present invention relates to the field of battery materials, more specifically positive electrode materials for zinc-nickel primary batteries, zinc-nickel secondary batteries and other batteries with nickel compounds as active materials, such as cadmium-nickel batteries, metal hydride nickel batteries, iron-nickel batteries, etc. The preparation method of nickel oxyhydroxide. [0002] The invention also relates to the nanometer nickel oxyhydroxide prepared by the method. (2) Background technology [0003] At present, conventional battery electrode active materials are divided into charged state and discharged state. If electrodes with different initial charge states are assembled into a battery, there will inevitably be a problem of mismatching charge and discharge states, which will bring difficulties to the formation of the battery. In zinc-nickel secondary batteries, due to the positive electrode active material nickel hydroxide Ni(OH) 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/02C01G53/04H01M4/52
CPCY02E60/12Y02E60/10
Inventor 周震涛刘澧蒲
Owner SOUTH CHINA UNIV OF TECH
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