Method for Improving the Electrochemical Performance of Hydrogen Storage Alloy Powder Using Electropolymerized Polyaniline

A hydrogen storage alloy and polyaniline technology, applied in battery electrodes, circuits, electrolytic coatings, etc., can solve problems such as uneven mixing, difficult alloys to combine, affecting alloy structure and electrochemical performance, and achieve obvious improvement effects and production The effect of low cost and simple operation

Active Publication Date: 2011-12-14
INNER MONGOLIA XIAOKE HYDROGEN STORAGE ALLOY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if polyaniline is directly mixed into the hydrogen storage alloy in a simple way, the phenomenon of uneven mixing and difficulty in combining with the alloy will occur, which will affect the effect of polyaniline on the hydrogen storage alloy.
However, the mechanical ball milling method is not easy to mix polyaniline and hydrogen storage alloy evenly, and at the same time, it is very easy to produce an amorphous phase in the hydrogen storage alloy body, which affects the structure and electrochemical performance of the alloy itself.

Method used

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  • Method for Improving the Electrochemical Performance of Hydrogen Storage Alloy Powder Using Electropolymerized Polyaniline
  • Method for Improving the Electrochemical Performance of Hydrogen Storage Alloy Powder Using Electropolymerized Polyaniline
  • Method for Improving the Electrochemical Performance of Hydrogen Storage Alloy Powder Using Electropolymerized Polyaniline

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Experimental program
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Effect test

Embodiment 1

[0019] 1) Prepare 100ml of aniline containing 0.3mol / L, 3×10 -3 The mixed solution of the sulfuric acid of mol / L;

[0020] 2) Add 20g AB to the aforementioned mixed solution 5 Type (La 0.60 Ce 0.28 PR 0.03 Nd 0.09 Ni 3.94 mn 0.31 co 0.45 al 0.26 ) The hydrogen storage alloy powder is then placed in the electroplating device;

[0021] 3) Graphite is inserted into a mixed solution containing hydrogen storage alloy powder, the hydrogen storage alloy powder is used as an anode, graphite is used as a cathode, a DC voltage of 1.7V is applied, and the electrification time is 1 min. Stir at a rotating speed of 50 rpm, wash the processed alloy powder twice with water, filter with suction, and place it in a vacuum drying oven for vacuum drying before use;

[0022] 4) The treated alloy powder was characterized by field emission scanning electron microscopy and Fourier transform infrared spectroscopy, the results are shown in the attached figure 1 and figure 2 , it can be see...

Embodiment 2

[0024] 1) Prepare 100ml of aniline containing 0.25mol / L, 2×10 -3 The mixed aqueous solution of the dodecylbenzenesulfonic acid of mol / L;

[0025] 2) Add 10g AB to the aforementioned mixed solution 3 Type (La 0.85 Mg 0.15 Ni 2.95 mn 0.15 co 0.50 Al 0.10 ) hydrogen storage alloy powder;

[0026] 3) Using hydrogen storage alloy powder as the anode and graphite as the cathode, apply a DC voltage of 1V for 2 minutes. Stir at a rotating speed of 65 rpm, wash the treated alloy powder with water three times, filter it with suction, and place it in a vacuum drying oven for vacuum drying before use;

[0027] 4) The treated alloy powder was characterized by field emission scanning electron microscopy and Fourier transform infrared spectroscopy, the results are shown in the attached figure 1 and figure 2 , it can be seen from the figure that coral-like polyaniline can be found on the surface of the alloy in the field emission scanning electron microscope, and benzoquinone (N=Q=...

Embodiment 3

[0029] 1) Prepare 100ml of aniline containing 0.4mol / L, 3×10 -3 mol / L mixed aqueous solution of hydrofluoric acid;

[0030] 2) Add 50g AB to the aforementioned mixed solution 5 type (MlNi 4.19 mn 0.31 co 0.42 Al 0.23 ) hydrogen storage alloy powder;

[0031] 3) Using hydrogen storage alloy powder as the anode and graphite as the cathode, apply a DC voltage of 1.7V for 3 minutes. Stir under the condition that the rotating speed is 70 rpm, wash the processed alloy powder with water, filter it with suction, and place it in a vacuum drying oven for vacuum drying before use;

[0032] 4) The treated alloy powder was characterized by field emission scanning electron microscopy and Fourier transform infrared spectroscopy, the results are shown in the attached figure 1 and figure 2 , it can be seen from the figure that coral-like polyaniline can be found on the surface of the alloy in the field emission scanning electron microscope, and benzoquinone (N=Q=N), carbon-carbon doub...

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Abstract

The invention relates to a method for improving the electrochemical performance of hydrogen storage alloy powder by utilizing electropolymerization polyaniline, and belongs to the technical field of the surface treatment of hydrogen storage alloy. The method comprises the following steps of: putting hydrogen storage alloy powder of which the granularity is between 100 and 400 meshes into mixed solution containing phenylamine and protonic acid in a certain ratio, and stirring uniformly at a speed of between 50 and 100 revolutions / minute, wherein the mass ratio of the hydrogen storage alloy powder to the mixed solution is 10 / 100-100 / 100; and applying direct-current voltage of between 1 and 2 V for 0.5 to 5 minutes by taking the hydrogen storage alloy powder as an anode and graphite as a cathode, so that the phenylamine performs electro-deposition polymerization reaction on the surface of the hydrogen storage alloy powder to form a polyaniline membrane layer. In the method, a polyanilinewrapped membrane with electrical conductivity and corrosion resistance is formed on surfaces of hydrogen storage alloy powder particles to improve the hydrogen storage capacity, high-multiplying power discharging performance and cyclic stability of the hydrogen storage alloy. The method has the characteristics of simplicity of operation, low production cost, obvious improvement effect and the like.

Description

Technical field: [0001] The invention relates to a method for improving the electrochemical performance of hydrogen storage alloy powder by using electropolymerized polyaniline, which is related to the surface coating prepared on the hydrogen storage alloy that can improve the electrochemical performance of the hydrogen storage alloy, and belongs to the hydrogen storage alloy surface treatment technology field. Background technique: [0002] Nickel-metal hydride battery (Ni / MH battery) is a new type of secondary battery with hydrogen storage alloy as the negative electrode material. It has the advantages of high energy density, good overcharge / discharge resistance, no memory effect, and good environmental compatibility. Ni / MH batteries are widely used in lightweight, small and portable electronic devices such as hybrid electric vehicles (HEV) and aerospace energy. Finding ways to improve the overall performance of Ni / MH batteries has become one of the important directions f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02C25D13/08C25D13/12H01M4/38
CPCY02E60/12Y02E60/10
Inventor 韩树民沈文卓朱惜林周昱
Owner INNER MONGOLIA XIAOKE HYDROGEN STORAGE ALLOY CO LTD
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