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Preparation method and application of a new type of silicon-based composite porous negative electrode material for lithium ion battery

一种锂离子电池、负极材料的技术

Active Publication Date: 2022-02-15
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is to be able to overcome defects such as the volume effect of traditional silicon-based negative electrode materials in existing lithium-ion batteries during use, and to provide a preparation method for a new type of silicon-based composite porous negative electrode material for lithium-ion batteries and its application

Method used

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  • Preparation method and application of a new type of silicon-based composite porous negative electrode material for lithium ion battery
  • Preparation method and application of a new type of silicon-based composite porous negative electrode material for lithium ion battery
  • Preparation method and application of a new type of silicon-based composite porous negative electrode material for lithium ion battery

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Embodiment 1

[0046] The metal lithium sheet is used as the positive electrode sheet of the lithium ion battery to prepare a silicon copper composite powder as a negative electrode active substance of a lithium ion battery. The specific implementation steps are as follows: 10 μm silicon powder, 10 μm copper powder is mixed by volume ratio 1: 1, such as figure 1 In the ball mill, the rotation speed is 600 rpm, the spherium is 10: 1 (W), 12H, 24H ball mill, to obtain a negative electrode active substance and submissive SEM microscopic test ( figure 2 . By adjusting the heater and air compressor, the holding pressure and temperature is 2 MPa and 300 ° C, the spray distance is controlled at 30 mm, the nozzle scan speed is controlled at 0.1 m / s, and the stepper motor is set to 500 Hz, the thickness of the copper foil is 0.05mm, such as Figure 4 , Sprayed 1 second, prepared for composite coating, resulting in a composite negative electrode and subtracted by SEM ( Figure 5 .

[0047] Will 1mol·L -1 ...

Embodiment 2

[0052] The metal lithium sheet is used as the positive electrode sheet of the lithium ion battery to prepare a silicon copper composite powder as a negative electrode active substance of a lithium ion battery. The specific implementation steps are as follows: 10 μm silica powder, 10 μm copper powder is mixed in volume ratio 1: 1, 1: 2, 1: 3, such as figure 1 The ball mill is 600 rpm in the ball mill, the ball ratio is 10: 1 (W), and the ball milling of 24h is performed, and the negative electrode active material is obtained and the SEM microscopic test is performed. figure 2 , image 3 ), XRD comparison analysis ( Figure 8 . By adjusting the heater and air compressor, the holding pressure and temperature is 2 MPa and 300 ° C, the spray distance is controlled at 30 mm, the nozzle scan speed is controlled at 0.1 m / s, and the stepper motor is set to 500 Hz, the thickness of the copper foil is 0.05mm, such as Figure 4 , Sprayed 1 second, prepared for composite coating, resulting in a...

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Abstract

The invention discloses a preparation method and application of a novel silicon-based composite porous negative electrode material for a lithium-ion battery. Silicon powder and copper powder are mixed in proportion and then ground by a ball mill through a mechanical ball milling method to obtain a silicon-copper composite powder; The silicon-copper composite powder is deposited on the surface of the pre-cleaned copper substrate by cold spraying, and the composite electrode coating is prepared to obtain a new silicon-based composite porous negative electrode material for lithium-ion batteries. In the present invention, a micron-scale composite silicon-based negative electrode material with a nanostructure is prepared by using a combination of ball milling and cold spraying, and the fast electron transport channel provided by the combination of silicon and copper to build a skeleton, nanomaterials and the inside of the coating The void structure, which can effectively alleviate the volume effect problem that often occurs during the lithiation process, thereby improving the charge retention during charge-discharge cycles. The lithium ion battery provided by the invention has the advantages of good electrical conductivity, high initial Coulombic efficiency and long cycle life.

Description

Technical field [0001] The present invention pertains to a lithium ion battery, and in particular relates to a method for preparing a lithium ion battery novel composite porous Si negative electrode material. Background technique [0002] In recent years, for the sustainable development of emerging industries such as electric vehicles, has promulgated a series of policies supported and vigorously promote, which brings a broader space for development of lithium-ion batteries. Lithium-ion batteries from development up to now, has become the main choice for most portable electronic devices. While these batteries are currently the highest energy density, but higher performance demand has been spurred continue to improve battery capacity. Currently, the commercial lithium ion battery using a carbon-based material as a main negative electrode material, but a relatively low specific capacity of the carbon material has greatly limited the development of a lithium ion battery. In recent y...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/1395H01M10/0525B82Y40/00
CPCH01M4/362H01M4/386H01M4/62H01M4/626H01M4/628H01M4/1395H01M10/0525B82Y40/00Y02E60/10
Inventor 宋俊楚晓婉张琦陈宇慧刘娟芳陈清华
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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