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A kind of preparation technology of tin-copper alloy pole piece

A technology of tin-copper alloy and preparation process, which is applied in the field of preparation technology of tin-copper alloy pole pieces, can solve the problems of low quality of tin-copper alloy and poor surface performance, and achieves fine powder particle size, improved performance and particle size. Evenly distributed effect

Active Publication Date: 2019-10-11
LIUZHOU HAOXIANGTE SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of preparation methods, the preparation of tin-copper alloys has the advantages of low cost, simple operation, and easy control of composition and thickness. However, the quality of tin-copper alloys prepared by existing methods is not high and the surface properties are not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The preparation technology of tin-copper alloy powder of the present invention, it adopts the following steps:

[0025] First, bulk Cu 5 sn 6 melted, and then the molten Cu 5 sn 6 The fluid is sprayed vertically to the surface of the high-speed rotating roller through the nozzle; there are several spherical grooves on the surface of the roller, and the fluid that can be sprayed onto the surface of the roller flows into the groove, prolonging the residence time of the fluid on the surface and cooling it properly, so that the groove The uniformity of the particle size after the fluid in the spray chamber is thrown to the atomization chamber is better; in order to avoid the excessive residence time of the fluid on the surface, resulting in excessive powder particle size, the opening diameter of the groove of the present invention on the surface of the roller is 0.5-1mm. It is suitable, and should ensure that the mass flow rate of the fluid injection is 6-8g / s, the verti...

Embodiment 1

[0028] Bulk Cu 5 sn 6 melted, and then the molten Cu 5 sn 6 The fluid is sprayed vertically through the nozzle to the surface of the rotating roller with grooves; the opening diameter of the groove on the roller surface is 0.5 mm, the mass flow rate of the fluid injection is 6g / s, and the vertical distance between the nozzle and the roller is 0.01mm 1. The diameter of the roller is 40mm, and the rotation speed of the roller is 300r / min; at the same time, in the atomization chamber, maintain an angle of 45° with the horizontal direction and pass the high-pressure inert gas into the injection chamber at a speed of 30m / s to impact the fluid to the injection chamber. The cavity is sprayed into the collection chamber, and finally the tin-copper alloy powder is collected. After analysis, the diameter of all particle sizes is between 8-15 μm; the powder is pressed into a 50 μm thick tin-copper alloy foil; then the foil is placed in a furnace for sintering During sintering, a mixed...

Embodiment 2

[0030] Bulk Cu 5 sn 6 melted, and then the molten Cu 5 sn 6 The fluid is sprayed vertically through the nozzle to the surface of the rotating roller with grooves; the opening diameter of the groove on the roller surface is 0.7 mm, the mass flow rate of the fluid injection is 7g / s, and the vertical distance between the nozzle and the roller is 0.05mm 1. The diameter of the roller is 45mm, and the rotating speed of the roller is 320r / min; at the same time, in the atomization chamber, maintain an angle of 60° with the horizontal direction and pass the high-pressure inert gas into the injection chamber at a speed of 30m / s to impact the fluid to the injection chamber. The cavity is sprayed into the collection chamber, and finally the tin-copper alloy powder is collected. After analysis, the diameter of all particle sizes is between 3 and 9 μm; the powder is pressed into a 50 μm thick tin-copper alloy foil; then the foil is placed in a furnace for sintering During sintering, the ...

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Abstract

The invention relates to the field of preparation of tin-copper alloy powder, in particular to a preparation technology of a tin-copper alloy pole piece. The technology comprises the following steps: melting massive Cu<5>Sn<6>; vertically spraying the molten Cu<5>Sn<6> liquid to the surface of a roller which rotates at a high speed through a nozzle from top to bottom; throwing the liquid into an atomizing chamber at one side through the roller to form liquid drops; blowing the liquid drops to a spray chamber at one side of the atomizing chamber by a high-pressure inert gas from bottom to top in the atomizing chamber; spraying a gas-liquid mixture in the spray chamber to a collecting chamber; pressing the powder into tin-copper alloy foil; and putting the foil into a furnace and introducing a mixed gas of air and argon for sintering, so as to obtain the tin-copper alloy pole piece. The sprayed liquid is smashed through centrifugal force of the rotating roller; and the liquid drops are struck through a high-speed gas and are sprayed again, so that the prepared powder is relatively small in particle size and uniform in particle size distribution. Sintering is carried out by introducing the mixed gas of argon and air to obtain the tin-copper alloy oxide film pole piece, so that the performance of the tin-copper alloy oxide film pole piece is further improved.

Description

technical field [0001] The invention relates to the field of preparation of tin-copper alloy pole pieces, in particular to a preparation process of tin-copper alloy pole pieces. Background technique [0002] Lithium battery is one of the most important power sources of existing electrical appliances or power tools. In order to improve the performance of lithium battery and increase the specific capacity of negative electrode, most manufacturers currently use tin negative electrode material. However, during the charge-discharge process, the tin anode has a large volume expansion rate, which will cause pulverization after long-term cycling, resulting in poor cycle performance. In order to solve these problems, composite alloys such as tin-copper alloys and tin-iron alloys are generally used as negative electrodes. From the perspective of preparation methods, the preparation of tin-copper alloys has the advantages of low cost, simple operation, and easy control of composition ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/134H01M4/1395H01M4/04
CPCH01M4/0433H01M4/0471H01M4/134H01M4/1395H01M4/387H01M2004/027Y02E60/10
Inventor 易鉴荣林荔琍唐臻吴坚林荔珊
Owner LIUZHOU HAOXIANGTE SCI & TECH