Preparation method of porous silicon carbon negative electrode applicable to lithium ion battery

A technology for carbon negative electrode materials and lithium-ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of large specific surface area of ​​porous silicon, reduced battery reversible capacity, low Coulombic efficiency, etc., to achieve lower specific surface area, better Market potential, the effect of simple process equipment

Inactive Publication Date: 2018-04-13
HUZHOU CHUANGYA POWER BATTERY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specific surface area of ​​porous silicon is large, and a large amount of lithium is consumed when forming the SEI film, resulting in a very low initial Coulombic efficiency of the material, thereby reducing the reversible capacity of the corresponding battery.

Method used

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  • Preparation method of porous silicon carbon negative electrode applicable to lithium ion battery
  • Preparation method of porous silicon carbon negative electrode applicable to lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0046] Weigh 30 g of porous silicon with a medium particle size of about 3 microns and a porosity of about 85%, add it to 400 g of a 30% starch solution, and stir evenly. The material was pulverized after vacuum drying at 70°C for 12 hours. After mixing 150 g of the pulverized material with 30 g of pitch, it was heated to 300° C. while stirring under a nitrogen atmosphere and kept for 1.5 hours. The heat-treated material was pulverized and carbonized by heating to 1000° C. for 6 hours under a nitrogen atmosphere. The material obtained after carbonization is pulverized and passed through a 325-mesh sieve to obtain the final material.

[0047] The material was prepared into a 2032 button battery, and the electrochemical performance was tested by a constant current on a charge-discharge tester. The charge-discharge current was set to 150mA / g, and the voltage range was 0.01-2V. The first coulombic efficiency of the corresponding lithium-ion battery was determined to be 80.6%, an...

Embodiment 1-2

[0049] Weigh 30 g of porous silicon with a medium particle size of about 3 microns and a porosity of about 85%, add it to 300 g of 30% starch solution, and stir evenly. The material was pulverized after vacuum drying at 70°C for 12 hours. After mixing 150 g of the pulverized material with 40 g of pitch, it was heated to 300° C. while stirring under a nitrogen atmosphere and kept for 1.5 hours. The heat-treated material was pulverized and carbonized by heating to 1000° C. for 6 hours under a nitrogen atmosphere. The material obtained after carbonization is pulverized and passed through a 325-mesh sieve to obtain the final material.

[0050] The material was prepared into a 2032 button battery, and the electrochemical performance was tested by a constant current on a charge-discharge tester. The charge-discharge current was set to 150mA / g, and the voltage range was 0.01-2V. The first coulombic efficiency of the corresponding lithium-ion battery was determined to be 83.2%, and ...

Embodiment 1-3

[0052] Weigh 30 g of porous silicon with a medium particle size of about 3 microns and a porosity of about 85% and add it to 400 g of 30% sucrose solution and stir evenly. The material was pulverized after vacuum drying at 70°C for 12 hours. After mixing 150 g of the pulverized material with 30 g of pitch, it was heated to 300° C. while stirring under a nitrogen atmosphere and kept for 1.5 hours. The heat-treated material was pulverized and carbonized by heating to 1000° C. for 6 hours under a nitrogen atmosphere. The material obtained after carbonization is pulverized and passed through a 325-mesh sieve to obtain the final material.

[0053] The material was prepared into a 2032 button battery, and the electrochemical performance was tested by a constant current on a charge-discharge tester. The charge-discharge current was set to 150mA / g, and the voltage range was 0.01-2V. The first coulombic efficiency of the corresponding lithium-ion battery was determined to be 76.9%, a...

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Abstract

The invention provides a preparation method of a porous silicon carbon negative electrode applicable to a lithium ion battery, and belongs to the technical field of lithium ion batteries. The method comprises the following steps of (a) adding porous silicon into a water-soluble carbon-based material aqueous solution for uniform stirring; (b) drying and smashing the obtained suspension liquid; (c)performing thermal treatment after the obtained powder and a carbon-based material capable of being soften are uniformly mixed; (d) performing carbonization after the smashing the material subjected to thermal treatment; and (e) classifying or sieving the carbonized material after being smashed, and taking particles with fineness being 200 meshes or above, thereby obtaining the required porous silicon carbon negative electrode material. By combining the carbon material with the interior and the surface of porous silicon, the structural strength, the initial coulombic efficiency and the cycle property of the porous silicon-based material are further improved; and moreover, the raw material is low in cost, the process equipment is simple, industrial production is easy, and the preparation method has relatively good market potential.

Description

technical field [0001] The invention relates to negative electrode materials for lithium ion batteries, in particular to a preparation method for porous silicon carbon negative electrode materials suitable for lithium ion batteries. Background technique [0002] Lithium-ion batteries have attracted people's attention due to their high energy density and good cycle performance, and have been developed rapidly in the past 20 years. At present, the negative electrode materials of commercial lithium-ion batteries are mainly various graphite materials, and their theoretical specific capacity is 372mAh / g. However, the current commercial graphite anode material is close to its theoretical specific capacity. To further increase the energy density of lithium-ion batteries, it is necessary to develop new high-capacity lithium-ion battery anode materials. At present, silicon-based anode materials have attracted more and more attention because of their high theoretical specific capacit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 郭挺袁旭蔡新辉王双才吕猛胡博
Owner HUZHOU CHUANGYA POWER BATTERY MATERIALS
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