Preparation method of lithium ion battery silicon-carbon anode material

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low material production efficiency, unfavorable industrialized production, low first coulomb efficiency, etc., and achieve sufficient supply and low equipment cost. , the effect of improving the first efficiency

Inactive Publication Date: 2018-01-26
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

[0004] However, the following problems still exist in the preparation of silicon carbon anode materials: ① low initial coulombic efficiency; ② short cycle life; ③ poor rate performance; ④ low material production efficiency; ⑤ high cost of raw materials, which is not conducive to industrial production

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  • Preparation method of lithium ion battery silicon-carbon anode material

Examples

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Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 of the present invention provides a method for preparing a silicon-carbon negative electrode material for a lithium-ion battery, including the following steps.

[0029] (1) Add D50=5μm polysilicon and zirconia balls into the zirconia ball milling tank at a mass ratio of 1:3, turn forward at 300 rpm for 30 minutes and then let it stand for 5 minutes. After standing, turn it forward at 300 rpm Reverse the minutes for 30 minutes, continue to stand still for 5 minutes, and then continue to rotate forward, so reciprocating, to meet the total ball milling time of 12h. After the ball milling is completed, zirconia balls and silicon powder are separated through a sieve to obtain nano-sized silicon powder.

[0030] (2) Add the nano-scale silicon powder obtained in step (1) and the conductive agent Super-P into the zirconia ball milling tank at a mass ratio of 10:2, and continue to add the Zirconium balls, the uniform powder of nano silicon powder and Super-P can be ob...

Embodiment 2

[0036] Example 2 of the present invention provides a method for preparing a silicon-carbon negative electrode material for a lithium-ion battery, including the following steps.

[0037] (1) Add D50=5μm polysilicon and zirconia balls into the zirconia ball milling tank at a mass ratio of 1:3, rotate forward at 200 rpm for 30 minutes and then stand for 5 minutes. After standing, turn at 200 rpm Reverse the minutes for 30 minutes, continue to stand still for 5 minutes, and then continue to rotate forward, so reciprocating, to meet the total ball milling time of 14h. After the ball milling is completed, zirconia balls and silicon powder are separated through a sieve to obtain nano-sized silicon powder.

[0038] (2) Add the nano-scale silicon powder obtained in step (1) and the conductive agent Super-P into the zirconia ball mill tank according to the mass ratio of 10:1, and continue to add the oxidized powder at the mass ratio of material: zirconia ball = 1:3 Zirconium balls, the...

Embodiment 3

[0044] Example 3 of the present invention provides a method for preparing a silicon-carbon negative electrode material for a lithium-ion battery, including the following steps.

[0045] (1) Add D50=5μm polysilicon and zirconia balls into the zirconia ball milling tank at a mass ratio of 1:3, turn forward at 400 rpm for 30 minutes and then let it stand for 5 minutes. After standing, turn it forward at 400 rpm Reverse the minutes for 30 minutes, continue to stand still for 5 minutes, and then continue to rotate forward, so reciprocating, to meet the total ball milling time of 16h. After the ball milling is completed, zirconia balls and silicon powder are separated through a sieve to obtain nano-sized silicon powder.

[0046] (2) Add the nano-scale silicon powder obtained in step (1) and conductive graphite as a conductive agent into the zirconia ball mill tank at a mass ratio of 10:3, and continue to add zirconia at a mass ratio of material: zirconia balls = 1:3 Balls, after ba...

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Abstract

The invention discloses a preparation method of a lithium ion battery silicon-carbon anode material. The preparation method comprises following steps: 1, raw material silicon powder is subjected to ball milling so as to obtain nanoscale silicon powder; 2, the nanoscale silicon powder is mixed with a conductive agent via solid phase material mixing; 3, liquid phase coating is adopted so as to formamorphous carbon coating layers on the surfaces of the nanoscale silicon powder and the conductive agent; 4, an obtained coated material is subjected to high temperature sintering in a furnace under inert gas protection; 5, mechanical ball milling is adopted to prepare a silicon-carbon material with an appropriate particle size; and 6, the silicon-carbon material is mixed with commercial graphiteso as to obtain the lithium ion battery silicon-carbon anode material. The preparation method is capable of increasing the primary coulombic efficiency and the cycling performance of the lithium ion battery silicon-carbon anode material, the process is simple, efficiency is high, the preparation method is friendly to the environment, and is beneficial for large scale production of silicon-carbon anode materials.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a method for preparing a silicon-carbon material and its application on a negative electrode of a lithium ion battery. Background technique [0002] The energy crisis and environmental problems in contemporary society are becoming more and more serious, and it is extremely urgent to find a new type of clean energy. In this context, lithium-ion batteries have basically occupied the portable electronic device market due to their high energy density, long cycle life and environmental friendliness. In addition, it has broad application prospects in electric vehicles, portable power supplies, and large-scale energy storage. [0003] At this stage, the anode materials of commercial lithium-ion batteries are mainly modified natural graphite and artificial graphite, and their theoretical specific capacity is only 372 mAh / g, which is difficult to meet the market demand. Silicon has attr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525
CPCY02E60/10
Inventor 韩少峰韩峰孙玉治杨栋梁彭渊敏胡美萍李龙邱晓斌刘高浪
Owner 赣州市瑞富特科技有限公司
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