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
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[0027] Example 1: High purity Ni(OH) 2 Preparation of nanotubes.
[0028] Experimental steps: (1) Put an alumina template (diameter 47mm, pore diameter 200nm, thickness 60μm, Whatman, England) into 0.4M NiCl 2 Soak in the solution for half an hour to make NiCl 2 The solution is fully immersed in the pores 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, the ammonia water penetrates into the micropores and penetrates the template, and interacts with the NiCl attached to the pore wall of the template. 2 Reaction to produce Ni(OH) 2 . Under visible light, the human eye can observe that the color of the template gradually changes 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 remaining green solids ...
Example Embodiment
[0032] Example 2:
[0033] Nanotube Ni(OH) prepared according to Example 1 2 Or commercial spherical nickel hydroxide (Tanaka Chemical, Japan) as the positive electrode active material, carbon black as the conductive agent, polytetrafluoroethylene (PTFE) as the binder, and foamed nickel as the current collector to make the positive electrode sheet. Active material Ni(OH) 2 The mass percentage of carbon black and PTFE is Ni(OH) 2 : Carbon black: PTFE=85:10:5. Accurately weigh each component, grind it thoroughly, mix it evenly, adjust the mixture into a paste with an appropriate amount of absolute ethanol, and evenly coat it on the foamed nickel substrate, dry it at 80°C for 1 hour, and press it. The tablet machine presses into a positive electrode film with a thickness of about 0.4 mm as a 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 produced by I...
Example Embodiment
[0034] Example 3:
[0035] Nanotube Ni(OH) prepared according to Example 2 2 Electrode and spherical Ni(OH) 2 The electrodes are 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 Electrode and spherical Ni(OH) 2 Comparison of the specific discharge 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 discharging at 20°C and a ...
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