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Nickel hydroxide nanotube and its prepn and application

A technology of nickel hydroxide and nanotubes, applied in nickel oxide/nickel hydroxide, nanostructure manufacturing, nanotechnology, etc., to achieve the effect of improving discharge specific capacity and good controllability

Inactive Publication Date: 2005-04-27
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In addition, except for this topic about Ni(OH) 2 Preparation of nanotubes and their research as positive electrode active materials for alkaline secondary batteries [F.S.Cai, G.Y. Zhang, J.Chen, et al.Ni(OH) 2 Tubes with Mesoscale Dimensions as Positive-Electrode Materials of Alkaline Rechargeable Batteries Angew.Chem.Int.Ed.2004, 43, 4212-4216], Ni(OH) 2 The preparation and properties of nanotubes have not been reported at home and abroad

Method used

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  • Nickel hydroxide nanotube and its prepn and application

Examples

Experimental program
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Embodiment 1

[0027] Embodiment 1: high-purity Ni(OH) 2 Preparation of nanotubes.

[0028] Experimental steps: (1) put the alumina template (diameter 47mm, pore size 200nm, thickness 60μm, Whatman, England) into 0.4M NiCl 2 Soak in the solution for half an hour to make the NiCl 2 The solution is fully immersed in the micropores of the template; (2) from NiCl 2 Remove the template from the solution and dry it. Slowly add ammonia water with a concentration of 1M to the surface of the template. Under the action of gravity and capillary action, the ammonia water penetrates into the micropores and penetrates the template, and the NiCl attached to the wall of the template hole 2 The reaction produces Ni(OH) 2 . Under visible light, the color of the template can be observed by the human eye gradually changing from white to light green. (3) After repeating steps (1) and (2) 4 times, rinse the template with distilled water, and dissolve the template in 2M NaOH solution. (4) Collect the green ...

Embodiment 2

[0033] Nanotube Ni(OH) prepared according to embodiment 1 2 Or commercial spherical nickel hydroxide (Tanaka Chemical, Japan) is used as the positive electrode active material, carbon black is used as the conductive agent, polytetrafluoroethylene (PTFE) is used as the binder, and nickel foam is used as the current collector to make the positive electrode sheet. Active materialNi(OH) 2 , carbon black, PTFE mass percentage is Ni(OH) 2 : Carbon black: PTFE = 85:10:5. Accurately weigh each component, grind it fully and mix it uniformly, make the mixture into a paste with an appropriate amount of absolute ethanol, and apply it evenly on the nickel foam substrate, dry it at 80°C for 1 hour, and use a press The tablet machine presses the positive electrode film with a thickness of about 0.4mm as the positive electrode sheet. Use hydrogen storage alloy powder with a discharge capacity exceeding 200% of the positive electrode capacity (mixed rare earth hydrogen storage alloy MmNi pr...

Embodiment 3

[0035] Nanotube Ni(OH) prepared according to embodiment 2 2 Electrode and spherical Ni(OH) 2 The electrodes were subjected to discharge tests at different temperatures (20, 40, 60°C) and different current densities (50, 100, 150mA / g). Figure 6 Nanotube Ni(OH) 2 Electrodes and spherical Ni(OH) 2 Comparison of discharge specific capacity of electrodes at different temperatures and different current densities. Figure 6 It reflects the discharge specific capacity performance of the two electrodes at different temperatures and different current densities. It can be seen from the figure that the discharge specific capacity of the two electrodes decreases with the increase of temperature and current density, but at the same temperature and current density, the nanotube Ni(OH) 2 The discharge specific capacity of the electrode is always higher than that of spherical Ni(OH) 2 The specific discharge capacity of the electrode. For example, when discharged at 20°C and a current d...

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Abstract

The present invention relates to nickel hydroxide nanotube and its preparation and application. The nickel hydroxide nanotube has open-mouthed needle nanometer crystal structure and great specific surface area, and has length of 50-60 microns, outer diameter of 180-220 nm and tube wall thickness of 20-30 nm. The nickel hydroxide nanotube of the present invention is one excellent kind of reversible charging and discharging matter, and when used in electrochemical oxidation and reduction, it has fast charging and discharging speed, high electrochemical capacity and long circulating life. It may be used in raising specific discharging capacity, high multiplying factor and high temperature discharging performance of nickel electrode and may be used in developing new type of secondary alkali battery.

Description

technical field [0001] The invention relates to the preparation of a novel electrode material, in particular to the nickel hydroxide nanotube, its preparation method and its application. The nickel hydroxide nanotube prepared by chemical reaction at room temperature has a needle-like nanocrystal structure, the length is 50-60 μm, the outer diameter is 180-220nm, and the tube wall thickness is 20-30nm. Using nickel hydroxide nanotubes as electrode materials can effectively improve the discharge specific capacity, high rate and high temperature discharge performance of nickel electrodes, so it can be applied to the development of new alkaline secondary batteries. Background technique [0002] In recent years, due to the rapid development of the global information industry, the demand for batteries in various small portable electronic devices such as mobile communications and notebook computers has soared, making secondary batteries occupy an increasingly important position in ...

Claims

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Application Information

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IPC IPC(8): B82B1/00C01G53/04H01M4/52
CPCY02E60/12Y02E60/10
Inventor 陈军李玮瑒蔡锋石苟兴龙高峰
Owner NANKAI UNIV
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