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High-activity hollow-out silver powder and preparation method thereof

A high-activity silver powder technology, applied in the field of high-activity silver powder preparation, can solve problems such as large concentration gradient, lower positive electrode potential, and large concentration polarization

Inactive Publication Date: 2014-10-15
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that although the specific surface area increases and the activity becomes higher, there are quite a lot of independent micropores after the silver oxide electrode is made, the concentration gradient of the reactant and the reaction product is large, and the concentration polarization caused by mass transfer is large. Lead to a serious decrease in the potential of the positive electrode, and the utilization of the positive active material

Method used

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  • High-activity hollow-out silver powder and preparation method thereof
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  • High-activity hollow-out silver powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Prepare silver nitrate into a solution with a concentration of 65 g / L, macroporous resin (styrene-divinylbenzene resin, average particle size 0.35 mm, average pore size of the resin The specific surface area is 650 square meters / g) In the plexiglass column, the silver nitrate solution prepared above is fed at a flow rate of 75 ml / min by the method of extraction chromatography, and the received solution is checked with a 10% sodium chloride solution. White precipitation starts, and the received solution recycle and re-use. The silver nitrate resin thus obtained was transferred to the barrel for reduction experiment.

[0024] (2) Put the barrel containing the silver nitrate resin obtained in step (1) into a 65°C hot water bath, stir the silver nitrate resin, and heat it until the temperature of the silver nitrate resin is 30°C, and add 70 ml of ammonia while stirring. When the silver nitrate resin system reaches pH=8, add 180 ml of hydrazine hydrate, continue to stir f...

Embodiment 2

[0027] (1) Prepare silver nitrate into a solution with a concentration of 220 g / L, and mix the macroporous resin (styrene-methyl methacrylate with a specific surface area of ​​750m 2 / g, average pore size , Average particle size 0.64 mm) into In the organic glass column, the extraction chromatography method is adopted, and the flow rate of the silver nitrate solution is 300 ml / min to obtain the silver nitrate resin.

[0028] (2) When the silver nitrate resin obtained in step (1) is heated to 60°C, add ammonia under stirring. When the silver nitrate resin system reaches pH=8, add 180 ml of hydrazine hydrate, continue stirring for 30 minutes, and leave for 1 hour Above, the reduction of silver is complete, and silver resin is obtained. Wash with deionization to obtain a silver resin with a pH of 7, and then filter, and put the filtered silver resin into a dish. In an oven, dry for 12 hours at a temperature of 100°C.

[0029] (3) Put the dried silver resin into the crucible, then p...

Embodiment 3

[0031] (1) Prepare silver nitrate into a solution with a concentration of 120 g / L, and mix the macroporous resin (styrene-ethanol dimethacrylate, specific surface area 950m 2 / g, aperture (Average particle size 0.75 mm) loaded In the organic glass column, the extraction chromatography method is adopted, and the flow rate of the silver nitrate solution is 200 ml / min to obtain the silver nitrate resin.

[0032] (2) When the silver nitrate resin obtained in step (1) is heated to 70℃, add ammonia while stirring. When the silver nitrate resin system reaches pH=8, add 180 ml of hydrazine hydrate, continue stirring for 30 minutes, and leave it for more than 1 hour , The silver reduction is complete, and silver resin is obtained. Wash with deionization to obtain a silver resin with a pH of 7, and then filter, and put the filtered silver resin into a dish. In an oven, dry for 3 hours at a temperature of 180°C.

[0033] (3) Put the dried silver resin into the crucible, then put it into th...

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Abstract

The invention relates to high-activity hollow-out silver powder and a preparation method thereof and belongs to the field of preparation for high-activity silver powder. The silver powder particles are of hollow-out sphere-like shapes; the diameters of the particles are 35-150 micrometers; the specific area of the particles is not smaller than 25 square meters / gram. The silver powder disclosed by the invention is hollow-out sphere-like powder; in addition, a large quantity of nano holes exist in each particle; the inside of each particle is of a three-dimensional mesh structure; the holes are mutually communicated; by using a prepared silver oxide anode, the effective reaction area of the electrode can be effectively increased, the electric current density is reduced, further the polarization of the electrode is reduced and output performances (current and voltage) of a battery are improved; the voltage of the battery and the utilization rate of active substances are improved; in addition, under the condition that the porosity is ensured, compared with the traditional silver powder, the high-activity silver powder has the advantages that the thickness of the pressed silver oxide electrode is thinner under the condition of equal quantity, further the mass transfer efficiency is improved and the utilization rate of anode active substances is improved.

Description

Technical field [0001] The invention relates to a high-activity hollow silver powder and a preparation method thereof, and belongs to the field of high-activity silver powder preparation. Background technique [0002] At present, the research direction of high-activity silver powder is mainly to increase the specific surface area of ​​silver powder, such as making hollow spheres and nano-sized powders, or improving the surface activity of silver powder. The specific surface area of ​​the silver powder prepared by these studies was increased to 20 square meters / g compared with the specific surface area of ​​the traditional silver powder of 2 square meters / g, but the electrical performance indicators of the battery did not correspondingly improve after being made into the battery cathode material. The main reason is that although the specific surface area increases and the activity becomes higher, there are quite a lot of independent micropores after the silver oxide electrode is m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/30
Inventor 郎书玲张力陈松王力军尹延西罗远辉
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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