Silicon-copper composite material, preparation method and application in lithium ion battery

A composite material, copper sheet technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex process, high chemical vapor deposition cost, unfavorable large-scale production of products, etc., and achieve the effect of overcoming large-scale separation.

Active Publication Date: 2020-05-12
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of chemical vapor deposition is high, the process is complicated, the process is difficult to control, and it is difficult to obtain uniform products, which is not conducive to large-scale production

Method used

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  • Silicon-copper composite material, preparation method and application in lithium ion battery
  • Silicon-copper composite material, preparation method and application in lithium ion battery
  • Silicon-copper composite material, preparation method and application in lithium ion battery

Examples

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Effect test

Embodiment 1

[0035]In this embodiment, a silicon-copper composite material is specifically prepared through the following steps: first, a copper sheet with a thickness of 500 μm is selected as a substrate, and the copper sheet is polished and polished by a grinding machine until the roughness is 0.05; Pure silicon wafers were placed in a high-energy ball mill, ground for 20 minutes, filtered through a 270-mesh sieve for 2 hours, and then filtered through a 300-mesh sieve for 2 hours to obtain silicon particles with an average particle size of about 50 μm. Use a cold spray powder feeder to spray silicon particles on the surface of the substrate. Before spraying, you need to empty the cold spray powder feeder and the nozzle. The specific method is: first manually clean it, and then let the cold spray machine idle for 30 minutes. Next, add 500g of silicon particles to the cold spray powder feeder, adjust the speed of the sieve plate brush of the powder feeder to keep the powder output at 5g / mi...

Embodiment 2

[0038] In this embodiment, a silicon-copper composite material is specifically prepared through the following steps: first, a copper sheet with a thickness of 500 μm is selected as a substrate, and the copper sheet is polished and polished by a grinding machine until the roughness is 0.05; Pure silicon wafers were placed in a high-energy ball mill, ground for 30 minutes, filtered through a 270-mesh sieve for 2 hours, and then filtered through a 300-mesh sieve for 2 hours to obtain silicon particles with an average particle size of about 50 μm. Use a cold spray powder feeder to spray silicon particles on the surface of the substrate. Before spraying, you need to empty the cold spray powder feeder and the nozzle. The specific method is: first manually clean it, and then let the cold spray machine idle for 30 minutes. Next, add 500g of silicon particles to the cold spray powder feeder, adjust the speed of the sieve plate brush of the powder feeder to keep the powder output at 5g / m...

Embodiment 3

[0040] In this embodiment, a silicon-copper composite material is specifically prepared through the following steps: first, a copper sheet with a thickness of 500 μm is selected as a substrate, and the copper sheet is polished and polished by a grinding machine until the roughness is 0.05; Pure silicon wafers were placed in a high-energy ball mill, ground for 30 minutes, filtered through a 270-mesh sieve for 2 hours, and then filtered through a 300-mesh sieve for 2 hours to obtain silicon particles with an average particle size of about 50 μm. Use a cold spray powder feeder to spray silicon particles on the surface of the substrate. Before spraying, you need to empty the cold spray powder feeder and the nozzle. The specific method is: first manually clean it, and then let the cold spray machine idle for 30 minutes. Next, add 500g of silicon particles to the cold spray powder feeder, adjust the speed of the sieve plate brush of the powder feeder to keep the powder output at 5g / m...

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Abstract

The invention discloses a preparation method of a silicon-copper composite material, and belongs to the technical field of composite material preparation. The preparation method comprises the specific steps of taking a copper sheet as a base plate, performing polishing and grinding until the roughness is 0.05, providing silicon particles with the average particle size of 40-60 micrometers, spraying the silicon particles to the surface of the base plate by a cold spraying powder feeder, rapidly placing the copper sheet into a spraying bin by a manipulator, and performing spraying for two passes to obtain the silicon-copper composite material with a three-dimensional mosaic structure formed on the surface, wherein in a spraying process, the powder discharge capacity of the cold spraying powder feeder is 5g / min; the powder discharge pressure is 2-2.5MPa; the powder discharge temperature is 380-420 DEG C; and a nozzle of the cold spraying powder feeder and the base plate keep for 30min. The silicon-copper composite material is prepared from a silicon material by utilizing a low-cost cold spraying technology. Compared with a traditional method, the preparation method is simpler to operate; and the provided composite material is excellent in performance and can be widely applied to production of a lithium ion cell.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a silicon-copper composite material, a preparation method and an application in lithium ion batteries. Background technique [0002] Severe environmental problems such as energy and resource shortages, nuclear pollution, and global warming have prompted green development of energy production, storage, and conversion to become the focus of common attention in today's energy-saving society, and vigorously developing high-efficiency energy storage equipment has become an unavoidable task for scientists all over the world. major research topics. Among energy storage devices such as fuel cells, solar cells, lithium-ion batteries, and electrochemical capacitors, lithium-ion batteries have successfully occupied the portable electronic device market due to their unique advantages. However, in order to meet the needs of the future market, especially the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M10/0525
CPCH01M4/362H01M4/38H01M4/386H01M10/0525Y02E60/10
Inventor 张学清雷广平刘娟芳陈清华
Owner ZHONGBEI UNIV
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