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Method for hydrothermal synthesis of nickel hydroxide hierarchical structure microspheres assembled by nano-sheets

A nickel hydroxide, hierarchical structure technology, applied in nickel oxide/nickel hydroxide, nanotechnology and other directions, can solve the problems of complex process flow, high reaction temperature, large energy consumption, etc., achieve good application prospects, good repeatability, The effect of a large surface area

Inactive Publication Date: 2013-01-30
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, these methods usually use toxic organic solvents, or add various precipitants and expensive surfactants, or require high reaction temperature, high energy consumption, and complicated process flow

Method used

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  • Method for hydrothermal synthesis of nickel hydroxide hierarchical structure microspheres assembled by nano-sheets
  • Method for hydrothermal synthesis of nickel hydroxide hierarchical structure microspheres assembled by nano-sheets
  • Method for hydrothermal synthesis of nickel hydroxide hierarchical structure microspheres assembled by nano-sheets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Dissolve 0.11 g of nickel acetate in 25 ml of distilled water;

[0030] (2) Add 0.11 g of sodium polystyrene sulfonate aqueous solution (20 wt%) to the nickel acetate solution obtained in (1), and stir evenly to obtain a homogeneous system;

[0031] (3) Transfer the mixed system obtained in (2) to a polytetrafluoroethylene-lined autoclave, keep the temperature at 170 °C for 24 h, and then cool to room temperature;

[0032] (4) Centrifuge the reaction mixture with a high-speed centrifuge, remove the supernatant, wash the precipitate repeatedly with distilled water, and then wash with 95% ethanol or absolute ethanol until the clear liquid is colorless, and collect the product after drying.

Embodiment 2

[0034] (1) Dissolve 0.11g of nickel acetate in 25mL of distilled water;

[0035] (2) Add 0.11 g of sodium polystyrene sulfonate aqueous solution (20 wt%) to the nickel acetate solution obtained in (1), and stir evenly to obtain a homogeneous system;

[0036] (3) Transfer the mixed system obtained in (2) to a polytetrafluoroethylene-lined autoclave, keep the temperature at 140 °C for 24 h, and then cool to room temperature;

[0037] (4) Centrifuge the reaction mixture with a high-speed centrifuge, remove the supernatant, wash the precipitate repeatedly with distilled water, and then wash with 95% ethanol or absolute ethanol until the clear liquid is colorless, and collect the product after drying.

[0038] figure 1 It is a schematic diagram of the process flow of the present invention.

[0039] figure 2 Ni(OH) prepared for Example 1 2 The X-ray diffraction (XRD) pattern of the hierarchical structure material, where the abscissa is the diffraction angle (2 θ ), in degre...

Embodiment 3

[0043] (1) Dissolve 0.11g nickel acetate in 25 ml distilled water;

[0044] (2) Add 0.22 g of sodium polystyrene sulfonate aqueous solution (20 wt%) to the nickel acetate solution obtained in (1), and stir evenly to obtain a homogeneous system;

[0045] (3) Transfer the mixed system obtained in (2) to a polytetrafluoroethylene-lined autoclave, keep the temperature at 170°C for 24 h, and then cool to room temperature;

[0046] (4) Centrifuge the reaction mixture with a high-speed centrifuge, remove the supernatant, wash the precipitate repeatedly with distilled water, and then wash with 95% ethanol or absolute ethanol until the clear liquid is colorless, and collect the product after drying.

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Abstract

The invention belongs to the technical field of preparation of functional nano-materials, relates to a preparation method of nano-hierarchical structure nickel hydroxide and particularly relates to a method for hydrothermal synthesis of nickel hydroxide hierarchical structure microspheres assembled by nano-sheets. The method disclosed by the invention comprises the following steps of: mixing a nickel acetate (Ni(CH3COO)2) water solution with a polyethylene sodium benzenesulfonate water solution, placing in a high-pressure reaction kettle lined with polytetrafluoroethylene to perform hydrothermal reaction, cooling, then performing centrifugal separation, washing with water, washing with ethanol, and then drying. The nickel hydroxide hierarchical structure prepared by the method disclosed by the invention is good in monodispersity and uniform in appearance, the diameter is 1.5-3mu m, and the hierarchical structure is assembled by flaky nano-units in a spiral layer-by-layer superimposition way and belongs to a multi-stage mesoscopic structure. The structure material combines larger surface area and excellent anti-agglomeration stability, and has great application prospects in the fields of battery electrode materials, catalysis, air sensitivity and the like. The method disclosed by the invention has the advantages of simple process, no need of adding a precipitating agent, convenience in operation and good repeatability, and is expected to realize industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional nanometer materials, and relates to a preparation method of nickel hydroxide with nanometer hierarchical structure, in particular to a method for synthesizing nickel hydroxide hierarchical structure microspheres assembled with nanosheets by a hydrothermal method. Background technique [0002] Nickel hydroxide (Ni(OH) 2 ) is a water-insoluble hydroxide whose minerals are relatively rare. Nickel hydroxide has a layered crystal structure and is widely used on the electrodes of batteries. It is the positive electrode active material of various secondary batteries such as nickel-based batteries, such as MH-Ni, H 2 -Ni, Cd-Ni battery, the quality of nickel hydroxide plays a key role in the specific capacity and service life of the battery. Nickel hydroxide has two common crystal structures, α-phase and β-phase. β-Ni(OH) 2 Characterized by hexagonal brucite-like crystals, Ni(OH) 2...

Claims

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Application Information

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IPC IPC(8): C01G53/04B82Y40/00
Inventor 朱国兴徐欢沈小平周红波
Owner JIANGSU UNIV
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