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Preparation method of silicon-carbon negative electrode material for high-compaction-density lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve the problem of quickness, insufficient simplicity of the method, and compaction density of silicon-carbon negative electrode materials To achieve the effect of rich raw materials, improved comprehensive performance and wide range of raw materials

Active Publication Date: 2018-11-02
赣州市瑞富特科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] As mentioned above, the rapidity and simplicity of the method for the preparation of silicon-carbon anode materials at the present stage are still insufficient.
At the same time, in the actual application process, the compaction density of silicon-carbon anode materials is poor, and the energy density advantages of silicon-carbon anode materials cannot be fully utilized.

Method used

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  • Preparation method of silicon-carbon negative electrode material for high-compaction-density lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Add D50=5μm polysilicon and zirconia balls into the zirconia ball milling tank according to the mass ratio of 3:1, and add a certain amount of absolute ethanol at the same time. The mass ratio of ethanol to polysilicon powder is 1:1. Rotate forward at 500 rpm for 30 minutes and then stand still for 5 minutes. After standing still, reverse at 500 rpm for 30 minutes, continue to stand for 5 minutes, and then continue to rotate forward. Reciprocate in this way to meet the total ball milling time of 12 hours. After the ball milling is completed, zirconia balls and silicon powder are separated through a screen to obtain nano-scale silicon powder with D50=100nm.

[0033] (2) Add porous natural graphite to the ball mill tank, continue to add zirconia balls at a mass ratio of material: zirconia balls = 1:3, and run the ball mill at 300 rpm for 3 hours to obtain a micron-sized porous natural stone with D50=10μm toner.

[0034] (3) Add the uniform nano-silicon powder obtaine...

Embodiment 2

[0039] (1) Add D50=5μm polysilicon and zirconia balls into the zirconia ball milling tank according to the mass ratio of 3:1, and add a certain amount of absolute ethanol at the same time. The mass ratio of ethanol to polysilicon powder is 1:1. Rotate forward at 500 rpm for 30 minutes and then stand still for 5 minutes. After standing still, reverse at 500 rpm for 30 minutes, continue to stand for 5 minutes, and then continue to rotate forward. Reciprocate in this way to meet the total ball milling time of 12 hours. After the ball milling is completed, zirconia balls and silicon powder are separated through a screen to obtain nano-scale silicon powder with D50=200nm.

[0040] (2) Add porous natural graphite to the ball mill tank, continue to add zirconia balls at a mass ratio of material: zirconia balls = 1:3, and run the ball mill at 300 rpm for 3 hours to obtain a micron-sized porous natural stone with D50=10μm toner.

[0041] (3) Add the uniform nano-silicon powder obtaine...

Embodiment 3

[0046] (1) Add D50=5μm polysilicon and zirconia balls into the zirconia ball milling tank according to the mass ratio of 3:1, and add a certain amount of absolute ethanol at the same time. The mass ratio of ethanol to polysilicon powder is 1:1. Rotate forward at 500 rpm for 30 minutes and then stand still for 5 minutes. After standing still, reverse at 500 rpm for 30 minutes, continue to stand for 5 minutes, and then continue to rotate forward. Reciprocate in this way to meet the total ball milling time of 12 hours. After the ball milling is completed, zirconia balls and silicon powder are separated through a screen to obtain nano-scale silicon powder with D50=200nm.

[0047] (2) Add porous natural graphite to the ball mill tank, continue to add zirconia balls at a mass ratio of material: zirconia balls = 1:3, and run the ball mill at 300 rpm for 3 hours to obtain a micron-sized porous natural stone with D50=10μm toner.

[0048] (3) Add the uniform nano-silicon powder obtaine...

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Abstract

The invention discloses a preparation method of a silicon-carbon negative electrode material for a high-compaction-density lithium ion battery. The preparation method comprises the following steps: (1) preparing nano-sized silicon powder; (2) preparing micron-sized porous natural graphite; (3) mixing the prepared nano-sized silicon powder with the porous natural graphite by ball milling; (4) adding a solution in which a carbon source precursor is dispersed into a mixture of the nano-sized silicon powder and the natural graphite for secondary ball milling; (5) coating and carbonizing integrateddevice with a graphite negative electrode material under inert gas protection for granulation and high-temperature carbonization to obtain a silicon-carbon materials with appropriate particle size; and (6) blending the prepared silicon-carbon material with commercial graphite to form a silicon-carbon negative electrode material. The preparation method not only guarantees the first coulomb efficiency and cycle performance of the silicon-carbon negative electrode material, but also significantly improves the compaction density, thereby laying a foundation for further preparation of a high-energy-density battery. In addition, the preparation process is fast and convenient; raw materials are easy to obtain; and large-scale production and application of the silicon-carbon negative electrode material are facilitated.

Description

technical field [0001] The invention relates to the field of lithium battery materials, and in particular provides a high-density lithium-ion battery silicon-carbon negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high capacity, no memory effect, fast reversible charge and discharge, and high Coulombic efficiency, and are now widely used in 3C products, electric vehicles and energy storage technology. At present, the commercial negative electrode material graphite of lithium-ion batteries is close to the theoretical capacity of 372 mAh / g, and it is difficult to improve it. However, silicon is currently known as the negative electrode material with the highest specific capacity, reaching 4200 mAh / g, more than ten times that of graphite negative electrode material. At the same time, compared with the graphite negative electrode material silicon, it has a higher potential for lithium deinte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525B82Y30/00
CPCH01M4/366H01M4/386H01M4/583H01M10/0525B82Y30/00Y02E60/10
Inventor 韩峰孙玉治韩少峰彭渊敏杨栋梁李龙邱晓斌
Owner 赣州市瑞富特科技有限公司
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