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Preparation method of silicon carbon cathode material

A negative electrode material, silicon carbon technology, applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of uneven material composition, toxicity, and easy pollution of the environment by chemical substances, so as to ensure safety, uniform material dispersion, and reduce production. cost effect

Active Publication Date: 2018-09-21
NORTHERN ALTAIR NANOTECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the preparation process of silicon-carbon negative electrode materials, silicon powder is very easy to agglomerate, and it is very easy to cause uneven material composition, which seriously affects the cycle stability of the material. To solve this problem, chemical methods (i.e., through The method of adding various chemical solvents) to disperse silicon, but the chemical substances used in the dispersion process are easy to pollute the environment, and some of them contain toxicity, which threatens people's health.

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  • Preparation method of silicon carbon cathode material
  • Preparation method of silicon carbon cathode material
  • Preparation method of silicon carbon cathode material

Examples

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Embodiment 1

[0055] This embodiment provides a method for preparing a silicon-carbon negative electrode material, which includes the following steps:

[0056] (1) Under the protection of an inert gas, 25% wt of asphalt and 1% wt of polyethylene glycol are put into a mixer for heating and melting, and the heating temperature is 150° C.;

[0057] (2) Add 70%wt graphite and 4% nano-silicon powder to the mixer, and use the mixer to carry out mechanical stirring for 2 hours to obtain a premixed material;

[0058] (3) Put the premixed material into a self-cleaning twin-screw extruder for stirring, extrude and shear the material, fully disperse the silicon powder, and obtain a silicon-carbon precursor. Among them, the self-cleaning twin-screw extruder The screw speed is 200rpm, the heating temperature of the first section is 170°C, the heating temperature of the second section is 120°C, and the heating temperature of the third section is 80°C;

[0059](4) Under the protection of an inert gas, ca...

Embodiment 2

[0063] This embodiment provides a method for preparing a silicon-carbon negative electrode material, which includes the following steps:

[0064] (1) Under the protection of an inert gas, put 20%wt of high-density polyethylene and 0.8%wt of glycerin into a mixer for heating and melting, and the heating temperature is 160°C;

[0065] (2) Add 75%wt graphite and 4.2% nano-silicon powder to the mixer, and use the mixer to carry out mechanical stirring for 2 hours to obtain the premixed material;

[0066] (3) Put the premixed material into a self-cleaning twin-screw extruder for stirring, extrude and shear the material, fully disperse the silicon powder, and obtain a silicon-carbon precursor. Among them, the self-cleaning twin-screw extruder The screw speed is 200rpm, the heating temperature of the first section is 170°C, the heating temperature of the second section is 120°C, and the heating temperature of the third section is 80°C;

[0067] (4) Under the protection of an inert g...

Embodiment 3

[0071] This embodiment provides a method for preparing a silicon-carbon negative electrode material, which includes the following steps:

[0072] (1) Under the protection of an inert gas, 15%wt of asphalt and 1.2%wt of polyethylene glycol are put into a mixer for heating and melting, and the heating temperature is 100°C;

[0073] (2) Add 78.8%wt graphite and 5% nano-silicon powder to the mixer, and use the mixer to mechanically stir for 1 hour to obtain the premixed material;

[0074] (3) Put the premixed material into a self-cleaning twin-screw extruder for stirring, extrude and shear the material, fully disperse the silicon powder, and obtain a silicon-carbon precursor. Among them, the self-cleaning twin-screw extruder The screw speed is 200rpm, the heating temperature of the first section is 150°C, the heating temperature of the second section is 100°C, and the heating temperature of the third section is 50°C;

[0075] (4) Under the protection of an inert gas, carbonize th...

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Abstract

The invention discloses a preparation method of silicon carbon cathode material. The preparation method comprises the following steps of: heating a carbon source and melting; adding graphite and nanometer silicon powder into the melted carbon source, and stirring to obtain a pre-mixed material; stirring the pre-mixed material to obtain a silicon carbon precursor; carbonizing and crushing the silicon carbon precursor to obtain the silicon carbon cathode material. According to the preparation method of the silicon carbon cathode material, the carbon source is melted by heating, the graphite andnanometer silicon powder is added into the melted carbon source to be stirred to obtain the silicon-carbon precursor, carbonizing and crushing are carried out to obtain the silicon carbon cathode material, no chemical solvent is added, the safety of the production process is ensured, the material is uniformly dispersed, and meanwhile, the production cost is also reduced.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for preparing a silicon-carbon negative electrode material. Background technique [0002] In the preparation process of silicon-carbon negative electrode materials, silicon powder is very easy to agglomerate, and it is very easy to cause uneven material composition, which seriously affects the cycle stability of the material. To solve this problem, chemical methods (i.e., through The method of adding various chemical solvents) to disperse silicon, but the chemical substances used in the dispersion process are easy to pollute the environment, and some of them contain toxicity, which threatens people's health. Contents of the invention [0003] In view of this, one of the objectives of the present invention is to provide a method for preparing a silicon-carbon negative electrode material that is uniformly dispersed and does not produce toxic and harmful substances duri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCH01M4/38Y02E60/10
Inventor 白岩董阳阳马书良
Owner NORTHERN ALTAIR NANOTECH CO LTD
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