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Preparation method of flower-like alpha-nickel hydroxide

A nickel hydroxide and flower-like technology, which is applied in the field of preparation of inorganic compounds, can solve the problems of few pure-phase flower-like α-Ni

Inactive Publication Date: 2012-09-19
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the flower-like Ni(OH) prepared by the reported literature 2 Most of them are α and β mixed phases, but few about the preparation of pure phase flower-like α-Ni(OH) 2 report

Method used

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  • Preparation method of flower-like alpha-nickel hydroxide
  • Preparation method of flower-like alpha-nickel hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 0.238 g of nickel chloride hexahydrate and 0.280 g of urotropine into 5 mL of deionized water and stir to dissolve, then add 25 mL of ethanol to the mixture; add deionized water to the resulting solution to a volume of 40 mL, transferred to a 50 mL polytetrafluoroethylene-lined autoclave, reacted at 160 °C for 2 h, cooled, filtered, and washed several times with deionized hydrated absolute ethanol to filter out the product, and Placed in a vacuum drying oven at 60 °C to obtain flower-shaped α-Ni(OH) 2 . Its XRD image see figure 1 , SEM image see figure 2 .

[0025]

Embodiment 2

[0027] Add 1.45 g of nickel nitrate hexahydrate and 0.70 g of urotropine into 5 mL of deionized water and stir to dissolve, then add 10 mL of methanol to the mixture; add deionized water to the resulting solution to a volume of 40 mL, transferred to a 50 mL polytetrafluoroethylene-lined autoclave, reacted at 160 °C for 2 h, cooled, filtered, and then washed several times with deionized hydrated absolute ethanol to filter out the product, and placed Dry in a vacuum oven at 60 °C to obtain flower-like α-Ni(OH) 2 . Its XRD image and SEM image are as embodiment 1.

[0028]

Embodiment 3

[0030] Add 0.131 g of nickel sulfate hexahydrate and 0.210 g of urotropine into 5 mL of deionized water and stir to dissolve, then add 35 mL of ethanol to the mixture; add deionized water to the resulting solution to a volume of 40 mL, transferred to a 50 mL polytetrafluoroethylene-lined autoclave, reacted at 160 °C for 2 h, cooled, filtered, and then washed several times with deionized hydrated absolute ethanol to filter out the product, and placed Dry in a vacuum oven at 60 °C to obtain flower-like α-Ni(OH) 2 . Its XRD image and SEM image are as embodiment 1.

[0031]

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Abstract

The invention discloses a preparation method of flower-like alpha-Ni(OH)2. The preparation method comprises the following steps of: adding a nickel salt and urotropine into de-ionized water, stirring and dissolving, wherein the amount ratio of the nickel to the urotropine is 1:1-1:2, and the concentration of the nickel salt in the solution is 0.1-1 mol / L; taking 5 mL of mixed solution; adding 10-35 mL of lower alcohol into the mixed solution; adding the obtained solution into de-ionized water until the volume is 40 mL; transferring to 50 mL polytetrafluoroethylene-lined high pressure reaction kettle; reacting at 160 DEG C for 2 hours; cooling; filtering; washing with the de-ionized water and absolute ethyl alcohol for many times to filter a product respectively; an holding in a vacuum drying box of 60 DEG C for drying to prepare the flower-like alpha-Ni(OH)2. According to the preparation method, the urotropine is used as a precipitator, the ethanol is used as a solvent, and the finally purer flower-like alpha-Ni(OH)2 is prepared.

Description

technical field [0001] The invention relates to a method for preparing an inorganic compound, in particular to a method for preparing flower-shaped α-phase nickel hydroxide by a solvothermal method. [0002] Background technique [0003] In recent years, studies have found that α-Ni(OH) 2 In some respects compared to β-Ni(OH) 2 Has more advantages, such as α-Ni(OH) 2 / γ-NiOOH charge-discharge cycle does not cause electrode expansion, no intermediate phase is formed in the electrode reaction, and the reversibility is good; α-Ni(OH) 2 The theoretical electron transfer number in the / γ-NiOOH pair reaction is 1.67, and its theoretical mass specific capacity ratio is β-Ni(OH) 2 high. From the perspective of chemical reaction, the formation of nickel hydroxide is very simple. Under alkaline conditions, nickel ions combine with hydroxide ions to form nickel hydroxide precipitates. However, it is difficult for the nickel hydroxide produced in this way to meet the requirements ...

Claims

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Application Information

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IPC IPC(8): C01G53/04
Inventor 黄礼胜周文娟周亚军姚成
Owner NANJING UNIV OF TECH
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