Method for synthesizing silicon/graphite/amorphous carbon/conductive carbon black quaternary composite material by using industrial metallurgical silicon

A technology of amorphous carbon and composite materials, which is applied in the direction of electrical components, circuits, battery electrodes, etc., can solve the problems of high electrode cost, unfriendly environment, and agglomeration, so as to improve the cycle life of charge and discharge, suppress volume expansion effect, and improve The effect of stability

Active Publication Date: 2019-12-13
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(3) The nano-scale silicon powder of the commodity is expensive, and there is a serious agglomeration phenomenon. Therefore, if the nano-silicon powder is used directly, the electrode cost will be very high, and the cycle life is not ideal because the nano-silicon powder is easy to agglomerate and has poor dispersion.
Therefore, industrial production by this method is not friendly to the environment and is harmful to human health

Method used

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  • Method for synthesizing silicon/graphite/amorphous carbon/conductive carbon black quaternary composite material by using industrial metallurgical silicon
  • Method for synthesizing silicon/graphite/amorphous carbon/conductive carbon black quaternary composite material by using industrial metallurgical silicon
  • Method for synthesizing silicon/graphite/amorphous carbon/conductive carbon black quaternary composite material by using industrial metallurgical silicon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1) Weigh 4.2 grams of industrial silicon material with a metallurgical-grade purity of 99.8% and a particle size in the range of 0.08-0.1 mm after crushing, and put solid steel balls with a diameter of 8 mm into the ball mill tank together. The ratio is 30:1, add 12.6 ml of absolute ethanol, and the protective atmosphere is argon. The ball mill jar is installed on the 800D ball mill, and the ball mill is rotated clockwise at 400RPM for 20 minutes, paused for 8 minutes, and then ball milled counterclockwise at the same speed for 20 minutes. Pause for 8 minutes, intermittently and automatically alternately repeat ball milling for 40 hours to obtain silicon powder slurry Ⅰ, and the silicon powder particles are mainly distributed in the range of 80-150 nanometers according to the laser diffraction particle size distribution tester (S3500-Mictrotrac).

[0056] 2) take by weighing 2.24 grams of spherical graphite powder and conductive carbon black (Super P TM ) of 0.56 g, whi...

Embodiment 2

[0060] 1) Same as Step 1 of Example 1 to obtain silicon powder slurry I.

[0061] 2) 2.38 grams of graphite powder mixture (spherical graphite and flake graphite are mixed with a weight ratio of 60:40) and conductive carbon black (Super P TM ) of 0.42 g, which were sequentially added to 14 ml of absolute ethanol solvent, subjected to magnetic stirring for dispersing and mixing for 15 hours, and then ultrasonic oscillation for dispersing and mixing for 1 hour to form a mixed slurry II. Add the mixed slurry II to the silicon powder slurry I, rinse the residual slurry II with a small amount of absolute ethanol solvent, carry out magnetic stirring and dispersion mixing for 18 hours, and then ultrasonically disperse and mix uniformly for 2 hours to obtain the mixed slurry III. Add steel balls, the weight ratio of steel balls to solid phase raw materials is 40:1, and the protective atmosphere is argon. Install the ball mill jar on the 800D ball mill, rotate clockwise at 200RPM for 2...

Embodiment 3

[0064] 1) Same as Step 1 of Example 1 to obtain silicon powder slurry I.

[0065] 2) Weigh 1.65 grams of spherical graphite powder, 1.11 grams of flake graphite powder and 0.68 grams of conductive carbon black (350G), add them to 17 milliliters of absolute ethanol solvent in turn, carry out magnetic stirring and dispersing mixing for 15 hours, and then ultrasonically oscillate and disperse and mix for 1 hours, a mixed slurry II was formed. Add the mixed slurry II to the silicon powder slurry I, rinse the remaining slurry II with a small amount of absolute ethanol solvent, carry out magnetic stirring and dispersion mixing for 18 hours, and then ultrasonically disperse and mix uniformly for 2 hours to obtain the mixed slurry III. Add steel balls, the weight ratio of steel balls to solid phase raw materials is 40:1, the protective atmosphere is argon, the ball mill jar is installed on the 800D ball mill, and the ball mill is rotated clockwise at 300RPM for 20 minutes, paused for ...

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Abstract

The invention discloses a method for synthesizing a silicon / graphite / amorphous carbon / conductive carbon black quaternary composite material by using industrial metallurgical silicon, and belongs to the technical field of lithium ion battery materials. According to the silicon / graphite / amorphous carbon / conductive carbon black quaternary composite material prepared by the invention, silicon particles are uniformly dispersed in a carbon matrix, the conductivity of the silicon particles is improved, the binding force between silicon-carbon layers and the binding force between carbon-carbon layersare enhanced through secondary high-energy ball milling, the stability of the silicon-carbon composite structure is remarkably improved, the volume expansion effect of silicon is effectively inhibited, and the charge-discharge cycle life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a method for synthesizing silicon / graphite / amorphous carbon / conductive carbon black quaternary composite material with industrial metallurgical silicon. Background technique [0002] The research and development of the next-generation lithium-ion power battery has a specific energy greater than 300 Wh / kg. It is impossible to use the traditional graphite anode. The use of silicon-carbon composite anode materials is an inevitable way out. Silicon-carbon composite materials are the key materials for the next-generation lithium-ion power battery. . Compared with graphite materials, the theoretical mass specific capacity of silicon is as high as 4200mAh / g, and the volume specific capacity is 7200mAh / cm 3 , which is more than 10 times that of graphite (the theoretical specific capacity of graphite is 372mAh / g), and the silicon material is abundant, lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 胡伟康
Owner ZHEJIANG NORMAL UNIVERSITY
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