Preparation method and application of novel silicon-based composite porous negative electrode material of lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effects of improving charge retention, buffering volume changes, and good electrical conductivity

Active Publication Date: 2021-06-01
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • 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

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  • Preparation method and application of novel silicon-based composite porous negative electrode material of lithium ion battery
  • Preparation method and application of novel silicon-based composite porous negative electrode material of lithium ion battery
  • Preparation method and application of novel silicon-based composite porous negative electrode material of 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, and the prepared silicon-copper composite powder is used as the negative electrode active material of the lithium ion battery. The specific implementation steps are as follows: mix 10 μm silicon powder and 10 μm copper powder in a volume ratio of 1:1, as figure 1 In the ball mill, the rotation speed is 600rpm, the ball-to-material ratio is 10:1 (w), ball milling is carried out for 12h and 24h, and the negative electrode active material is obtained and subjected to SEM microscopic test ( figure 2 ). By adjusting the heater and air compressor, the pressure and temperature are kept at 2MPa and 300°C respectively, the spraying distance is controlled at 30mm, the scanning speed of the nozzle is controlled at 0.1m / s, the pulse frequency of the stepping motor is set at 500Hz, and the thickness of the copper foil is 0.05mm, such as Figure 4 , sprayed 1 pass, prepared composite coatin...

Embodiment 2

[0052] The metal lithium sheet is used as the positive electrode sheet of the lithium ion battery, and the prepared silicon-copper composite powder is used as the negative electrode active material of the lithium ion battery. The specific implementation steps are as follows: mix 10 μm silicon powder and 10 μm copper powder according to the volume ratio of 1:1, 1:2, and 1:3 respectively, as figure 1 In the ball mill, the rotation speed is 600rpm, the ball-to-material ratio is 10:1 (w), and ball milling is carried out for 24 hours to obtain the negative electrode active material and carry out SEM microscopic test ( figure 2 , image 3 ), XRD comparative analysis ( Figure 8 ). By adjusting the heater and air compressor, the pressure and temperature are kept at 2MPa and 300°C respectively, the spraying distance is controlled at 30mm, the scanning speed of the nozzle is controlled at 0.1m / s, the pulse frequency of the stepping motor is set at 500Hz, and the thickness of the cop...

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Abstract

The invention discloses a preparation method and application of a novel silicon-based composite porous negative electrode material of a lithium ion battery. The preparation method comprises the following steps: mixing silicon powder and copper powder according to a ratio, and grinding by using a ball mill through a mechanical ball milling method to obtain silicon-copper composite powder; and depositing the silicon-copper composite powder on the surface of a pre-cleaned copper substrate in a cold spraying manner, and preparing a composite electrode coating to obtain the novel silicon-based composite porous negative electrode material of the lithium ion battery. The micron-sized composite silicon-based negative electrode material with a nano structure is prepared by adopting a method of combining a ball milling method and a cold spraying method, and a rapid electron transmission channel, a nano material and a gap structure in a coating provided by a framework are constructed by combining the two materials of silicon and copper, so the problem of volume effect frequently occurring in the lithiation process can be effectively relieved, and the charge retention capability in the charge-discharge cycle is improved. The lithium ion battery provided by the invention has the advantages of good conductivity, high initial coulombic efficiency and long cycle life.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method of a novel silicon-based composite porous negative electrode material for lithium ion batteries. Background technique [0002] In recent years, the country has successively issued a series of policies to support and vigorously promote the sustainable development of emerging industries such as electric vehicles, which brings a broader development space for lithium-ion batteries. Since its development, lithium-ion batteries have become the main choice for most portable electronic devices. Although these batteries currently have the highest energy density, the need for higher performance has been driving continuous increases in battery capacity. At present, commercial lithium-ion batteries mainly use carbon materials as anode materials, but the relatively low specific capacity of carbon materials greatly limits the development of lithium-ion bat...

Claims

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Application Information

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Patent Type & Authority Applications(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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