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A preparation method of silicon-carbon composite material for lithium ion battery

A technology of silicon-carbon composite materials and lithium-ion batteries, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problem of low gram capacity and achieve the effects of simple preparation process, easy operation, and reduced volume effect

Active Publication Date: 2016-03-23
NINGDE AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent 201110360267.8 is to use network-like expanded graphite with high conductivity in carbon negative electrode materials, but the hard carbon material has a lower gram capacity than silicon-based materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 , a preparation method of a lithium-ion silicon-carbon composite negative electrode material, the steps comprising:

[0019] Step 1. Mix 80.0g of nano silicon powder (D50: 200nm) and 16.0g of natural graphite, and then add it to 450g of methylpyrrolidone to obtain a mixture;

[0020] Step 2, stirring the mixture obtained in step 1, the stirring time is 2h, the stirring speed is 1000 rpm, and then ultrasonic treatment is carried out, the processing time is 1h, so that the silicon-based material is dispersed in the voids of the expanded graphite;

[0021] Step 3, the mixture obtained in step 2 is subjected to normal pressure filtration;

[0022] Step 4. Put the solid obtained in Step 3 into a drying oven for drying treatment; the drying temperature is selected to be 50° C., and the treatment time is 2 hours to obtain a silicon-carbon composite material.

Embodiment 2

[0023] Example 2 , a preparation method of a lithium-ion silicon-carbon composite negative electrode material, the steps comprising:

[0024] Step 1, 60.0g silicon composite material and 20.0g artificial graphite are mixed, then join in 400g acetone to obtain mixture;

[0025] Step 2, stirring the mixture obtained in step 1, so that the silicon-based material is dispersed in the gaps of the expanded graphite, the stirring time is 5h, and the stirring speed is 1500 rpm, and then ultrasonic treatment is carried out, and the processing time is 5h, so that Silicon-based materials are dispersed in the voids of expanded graphite;

[0026] Step 3, the mixture obtained in step 2 is subjected to vacuum filtration;

[0027] Step 4. Put the solid obtained in Step 3 into a drying oven for drying treatment; the drying temperature is 80° C., and the treatment time is 10 hours, and the silicon-carbon composite material is obtained.

Embodiment 3

[0028] Example 3 , a preparation method of a lithium-ion silicon-carbon composite negative electrode material, the steps comprising:

[0029] Step 1, mixing the mixture of 60.0g silicon composite material and 40.0g natural graphite and artificial graphite, then adding in 500g ethanol to obtain the mixture;

[0030] Step 2, stirring the mixture obtained in step 1, so that the silicon-based material is dispersed in the gaps of the expanded graphite, the stirring time is 10h, and the stirring speed is 1500 rpm, and then ultrasonic treatment is carried out, and the processing time is 8h, so that Silicon-based materials are dispersed in the voids of expanded graphite;

[0031] Step 3, centrifuging the mixture obtained in step 2;

[0032] Step 4. Put the solid obtained in Step 3 into a drying oven for drying treatment; the drying temperature is selected to be 100° C., and the treatment time is 18 hours to obtain a silicon-carbon composite material.

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PUM

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Abstract

The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method for preparing silicon-carbon composite materials for lithium-ion batteries; the steps include: 1) mixing silicon-based materials and expanded graphite at a ratio of (0.1-30): 1, and then Adding it into an organic solvent to obtain a mixture; 2), stirring the mixture obtained in step 1 for 2 to 15 hours, and then performing ultrasonic treatment for 1 to 10 hours, so that the silicon-based material is dispersed in the expanded graphite 3) Separating the mixture obtained in Step 2; 4) Putting the solid obtained in Step 3 in a drying oven for drying treatment; the silicon-carbon composite material is obtained. The invention uses the expanded graphite with obvious characteristics in the silicon negative electrode material with high energy density, improves the cycle life and initial efficiency of the silicon-carbon material, and solves the problem of rapid capacity decay of the silicon-based material in the cycle process.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a preparation method of a silicon-carbon composite material for lithium-ion batteries. Background technique [0002] With the development trend of personalization and multi-function of consumer electronic products, the high energy density, long service life and safety of batteries are more concerned. Therefore, some anode materials with high energy density have been extensively studied, such as silicon-based materials. Compared with traditional lithium-ion batteries, silicon-based materials have higher energy density. The theoretical specific capacity of silicon-based materials is 4200mAh / g, which is much higher than that of graphite, which is 372mAh / g. However, due to the high expansion rate of silicon-based materials (expansion rate to 300%), the negative electrode is pulverized, which limits its energy density and makes the capacity decay faster. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/38
CPCY02E60/10
Inventor 刘金峰何丽萍汪颖刘东任孙峰汪新
Owner NINGDE AMPEREX TECH
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