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Surface-modified electrode material, its surface modification and use

A technology of surface modification and electrode materials, which is applied in the direction of electrode manufacturing, battery electrodes, active material electrodes, etc., can solve the problems that rare earth oxides are not easy to obtain, and the improvement results are not obvious, so as to achieve good catalytic effect, high utilization rate, The effect of increasing the initial discharge capacity

Inactive Publication Date: 2010-02-17
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tao Daming et al. (Rare Metal Materials and Engineering, 2005, 34: 552) disclosed that La 2 o 3 , CeO 2 and other rare earth oxides are also on AB 5 The improvement of the electrochemical capacity and cycle stability of rare earth hydrogen storage alloys has obvious effects, but the improvement results are not obvious, and these rare earth oxides are not easy to obtain

Method used

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  • Surface-modified electrode material, its surface modification and use
  • Surface-modified electrode material, its surface modification and use
  • Surface-modified electrode material, its surface modification and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1 Electrode material of the present invention and surface modification method thereof

[0023] take AB 5 Type rare earth based hydrogen storage alloy powder 5g with V 2 o 5 Mix 0.15g of powder, grind it to make it evenly mixed, then place the ground mixed powder in the agate tank of the planetary ball mill, use absolute ethanol as the dispersant, the volume of ethanol is controlled to be 40 times the volume of the mixed powder, control the agate The mass of the ball is 15 times the mass of the mixed powder, and it is ball milled at a speed of 350r / min for 30 minutes. Naturally volatilize most of the ethanol at room temperature, place it in a vacuum drying oven at 40°C for 2 hours, remove the residual ethanol, adjust the temperature of the vacuum drying oven to 80°C and maintain it for 12 hours to further dehumidify and activate the alloy sample, and then get Transition metal oxide surface modified hydrogen storage alloy electrode material.

Embodiment 2

[0024] Embodiment 2 Electrode material of the present invention and surface modification method thereof

[0025] take AB 5 Type rare earth based hydrogen storage alloy powder 15g with V 2 o 5 Powder 0.45g is mixed, put into the agate jar of planetary ball mill, wherein V 2 o 5 The mass is AB 5 3% of the mass of type rare earth-based hydrogen storage alloy powder, using absolute ethanol as a dispersant, the volume of ethanol is controlled to be 40 times the volume of the material, the mass ratio of the control agate ball to the material is 15:1, and the rotating speed of 250r / min Ball mill for 30 minutes. Most of the ethanol is naturally volatilized at room temperature, placed in a vacuum drying oven at 40°C for 2 hours to remove residual ethanol, and the temperature of the vacuum drying oven is adjusted to 80°C and maintained for 12 hours to further dehumidify and activate the alloy sample. The hydrogen storage alloy electrode material modified by transition metal oxide ...

Embodiment 3

[0026] Embodiment 3 comparative experiment

[0027] take AB 5 Type rare earth-based hydrogen storage alloy powder and the electrode material powder obtained in Example 1, the modification effect is observed by SEM, figure 1 It is the surface morphology diagram of the electrode material obtained after ball milling of the original hydrogen storage alloy powder, Fig. figure 2 It is the surface topography diagram of the electrode material after the hydrogen storage alloy powder is modified by the method of Example 1 of the present invention. Depend on figure 1 and figure 2 It can be seen from the comparison that after the surface modification by the method of the present invention, the particles of the alloy are refined, and a special porous body phase structure similar to a honeycomb is formed at the same time, which greatly increases the specific surface area of ​​the alloy.

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Abstract

The invention is concerned with pole material, relating to a kind of pole material with decorated face and its face decorating method and application. The pole material is made of AB5 type rare-earthbased metal hydride alloy and transitional metal oxide, when the quality of transitional metal oxide is 0.5 to 10 percent of the quality of AB5 type rare-earth based metal hydride alloy. The face decorating method: (1) Equality mix and mill AB5 type rare earth based metal hydride alloy and transitional metal oxide. (2) Put the rubbed power into the agate jar of planetary ball milling with dehydrate alcohol for 10 to 30 minutes, then dry off alcohol.

Description

technical field [0001] The invention relates to electrode materials, in particular to a surface-modified electrode material and a surface modification method and application thereof. Background technique [0002] AB 5 type rare earth based hydrogen storage alloy is LaNi 5 and its derivatives (such as La 0.65 Ce 0.28 PR 0.02 Nd 0.05 Ni 3.8 co 0.7 mn 0.3 Al 0.2 ) alloys, currently commercially used for the negative electrode of nickel-metal hydride batteries is mainly AB 5 type rare earth based hydrogen storage alloy. The performance of electrode materials has a lot to do with the surface structure of electrode materials, so it is often necessary to modify the surface of electrode materials. At present, the commonly used surface modification methods for electrode materials include acid treatment, alkali treatment, surface plating, and addition of surface modification additives. The addition of additives can be divided into two categories according to the different ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/04H01M4/36B22F9/04
CPCY02E60/10
Inventor 郭先锋吕东生周柳李伟善
Owner SOUTH CHINA NORMAL UNIVERSITY