Preparation method and application of nanometer nickel hydroxide and composite electrode thereof

A nickel hydroxide, composite electrode technology, applied in nickel oxide/nickel hydroxide, electrode manufacturing, battery electrodes, etc., can solve the problems of low packing density, short discharge time, easy to agglomerate, etc.

Inactive Publication Date: 2009-09-09
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although nano-Ni(OH) 2 It has high activity, but some studies have also found that due to the low packing density of nanomaterials, large resistance between nanoparticles and easy agglomeration, and the mismatch between the size ratio of nano-nickel hydroxide particles and conductive agent particles, pure nano-Ni ( Oh) 2 As the active material of the electrode, its discharge time is shorter than that of industrial micron-sized spherical β-nickel hydroxide (β-Ni(OH) 2 ) is short, the overall performance of the corresponding battery is not ideal

Method used

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  • Preparation method and application of nanometer nickel hydroxide and composite electrode thereof
  • Preparation method and application of nanometer nickel hydroxide and composite electrode thereof
  • Preparation method and application of nanometer nickel hydroxide and composite electrode thereof

Examples

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Embodiment 1

[0038] The preparation of embodiment one nanometer nickel hydroxide

[0039] According to embodiment one step preparation concentration is the Ni(NO of 0.5mol / l 3 ) 2 ·6H 2 O solution 200ml and add 0.3g (mass ratio 3%) Polyethylene Glycol, 1mol / l Na (OH) solution 200ml and add ammoniacal liquor 11ml, two kinds of solutions are added dropwise and placed in the ultrasonic cleaner vibrating chamber ( Power 40W, frequency 40KHz) in the reaction vessel and constantly stirring, control the rate of addition and stirring speed (600 rpm), so that the reaction temperature of the solution in the reaction vessel remains at 60 ± 2 ° C, and the pH value remains at 10.50 ± 0.10. After the dropwise addition was completed, the stirring was continued for 2 to 4 hours. Then stand still, wash and filter, dry the composition in a drying oven at 90°C for more than 12 hours, take out and grind to obtain a sample, marked as s 1 . The XRD spectrum of its sample is attached figure 1 As shown in b...

Embodiment 2

[0041] Nano-Ni(OH) prepared by embodiment two different pH values 2 Bulk Density

[0042] Identical to other conditions and steps of Example 1, the pH value of the reaction solution was taken to be 9, 10, 10.5, 11, 11.5, 12 respectively, and six samples were prepared, and the bulk density was measured. The results are shown in the attached Figure 5 shown.

[0043] Active materialNi(OH) 2 The density is an important parameter to measure the electrochemical performance of materials. Figure 5 It shows that as the pH value of the solution increases, the bulk density first decreases and then increases.

Embodiment 3

[0044] Nano-Ni(OH) prepared by embodiment three different reaction temperatures 2 bulk density

[0045] The other conditions and steps are the same as those in Example 1, taking the reaction temperatures of 30, 40, 50, 55, 60, and 70°C respectively to prepare six samples and measure their bulk density. The results are shown in the attached Image 6 shown. Depend on Image 6 It can be seen that as the temperature increases, the bulk density of the sample decreases first and then increases.

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Abstract

The invention discloses a preparation method and an application of nanometer nickel hydroxide and a composite electrode thereof. The preparation method comprises the following steps: adopting nickel salt and alkali liquor as raw materials, synthesizing nanometer nickel hydroxide by a direct precipitation method under the cooperation of ultrasonic waves, dispersant and pH value buffering agent, doping the nanometer nickel hydroxide into industrial micron-size spherical nickel hydroxide by a certain proportion and preparing a high-capacity composite nickel electrode. The whole reaction process is always carried out in the environment of ultrasonic vibration; the microcosmic appearance of the prepared nanometer nickel hydroxide is of a needle shape or a mixed shape of the needle shape and a torispherical shape and has uniform particles, good dispersivity and high activity; the discharging capacity of the composite nickel electrode prepared by doping the nanometer nickel hydroxide into the spherical nickel hydroxide according to the proportion of 3 percent to 11 percent is improved by 2 percent to 16 percent compared with that of the pure spherical nickel electrode; and the preparation method is applicable to be used for improving the electrochemical property of the positive electrode of a nickel-hydrogen battery.

Description

technical field [0001] The invention relates to a preparation method and application of nano-nickel hydroxide and a composite electrode thereof, belonging to the field of nano-composite materials and advanced energy materials. Background technique [0002] Nickel hydroxide, as the positive electrode active material of the alkaline secondary battery, is the key material for increasing the battery capacity. Studies have shown that small particle size nano-sized nickel hydroxide (Ni(OH) 2 ) has better electrochemical reversibility, larger proton diffusion coefficient, and high discharge potential and low charge potential, that is, nano-Ni(OH) 2 Filled electrodes have less polarization, so it is particularly important to prepare more active nickel hydroxide. Nano Ni(OH) 2 There are many preparation methods, such as coordination precipitation method, precipitation transformation method, microemulsion method, solid phase reaction method, high energy ball milling method, etc., b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/04H01M4/04H01M4/52
CPCY02E60/12Y02E60/10
Inventor 朱燕娟黄亮国丘毅辉赵韦人李强
Owner GUANGDONG UNIV OF TECH
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