Spherical silicon/carbon composite material for lithium ion battery as well as preparation method and application thereof

A technology of silicon-carbon composite materials and carbon composite materials, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of complex preparation process of silicon nanotubes, difficulty in industrialized large-scale production, and low degree of practicality. Achieve the effects of improving poor circulation, increasing tap density, and reducing production costs

Active Publication Date: 2015-08-26
BEIJING IAMETAL NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of silicon nanowires and silicon nanotubes is complicated, the output is low, it is difficult to industrialize large-scale production, and the degree of practicality is low.

Method used

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  • Spherical silicon/carbon composite material for lithium ion battery as well as preparation method and application thereof
  • Spherical silicon/carbon composite material for lithium ion battery as well as preparation method and application thereof
  • Spherical silicon/carbon composite material for lithium ion battery as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1, the preparation of silicon-carbon composite material and its electrochemical performance test:

[0030] After pulverizing the silicon powder by ball milling for 1 hour, sand milling for 5 hours, the obtained silicon powder of uniform size is mixed according to the mass ratio of silicon powder:graphite=4:6, with water as the solvent and PVP as the polymer additive, with a weight average molecular weight of 300000, sucrose is the hydroxyl dispersant, stirred at room temperature for more than 5h, and a slurry with a viscosity of 200mPa·s was obtained. The slurry was spray-dried, the inlet temperature was 180°C, and the outlet temperature was 100°C, and then the spray-dried sample was sintered at 600°C in a nitrogen atmosphere at a heating rate of 5°C / min for 2 hours to obtain a porous Silicon-carbon composite material, the silicon content in the porous carbon-silicon composite material is 35%, and the carbon content is 65%.

[0031] Soak the porous silicon-c...

Embodiment 2

[0038] Example 2: After the silicon powder is ball milled for 1 hour, sand milled for 5 hours, the obtained silicon powder of uniform size is mixed according to the mass ratio of silicon powder: graphite=4:6, with water as the solvent and PVP as the polymer additive. The weight-average molecular weight is 300,000, and sucrose is the hydroxyl dispersant. Stir at room temperature for more than 5 hours to obtain a slurry with a viscosity of 200 mPa·s. The slurry was spray-dried, the inlet temperature was 180°C, and the outlet temperature was 100°C, and then the spray-dried sample was sintered at 600°C in a helium atmosphere with a heating rate of 5°C / min for 6 hours to obtain a porous The silicon-carbon composite material, the silicon content in the porous carbon-silicon composite material is 35%, and the carbon content is 65%.

[0039] Soak the sintered porous silicon-carbon composite material sample in a solution of gelatin and conductive graphite, stir for more than 10 hours, ...

Embodiment 3

[0043] After pulverizing the silicon powder by ball milling for 1 hour, sand milling for 5 hours, the obtained silicon powder of uniform size is mixed according to the mass ratio of silicon powder:graphite=4:6, with water as the solvent and PVP as the polymer additive, with a weight average molecular weight of 300000, sucrose hydroxyl as dispersant, stirred at room temperature for more than 5h to obtain a slurry with a viscosity of 200mPa·s. The slurry was spray-dried, the inlet temperature was 180°C, and the outlet temperature was 100°C, and then the spray-dried sample was sintered at 600°C in an argon atmosphere at a heating rate of 10°C / min for 2 hours to obtain a porous The silicon-carbon composite material, the silicon content in the porous carbon-silicon composite material is 35%, and the carbon content is 65%.

[0044] Soak the porous silicon-carbon composite material sample obtained after sintering in a solution of gelatin, conductive graphite, and petroleum pitch, sti...

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Abstract

The invention provides a spherical silicon/carbon composite material for a lithium ion battery and a preparation method thereof. The spherical silicon/carbon composite material for the lithium ion battery comprises a porous silicon/carbon composite material and an organic or inorganic carbon source filling the porous silicon/carbon composite material, wherein the content of silicon in the porous silicon/carbon composite material is 20% to 80%, and the content of carbon in the porous silicon/carbon composite material is 20% to 80%. The spherical silicon/carbon composite material for the lithium ion battery is high in cycling stability and high in tap density if applied to a lithium ion battery, and can be produced on a large scale.

Description

technical field [0001] The invention relates to a preparation method of a spherical silicon-carbon composite material and its application as a negative electrode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries have outstanding advantages such as high specific energy, small self-discharge, long service life, green and pollution-free, and have been widely used in portable electronic products and electric vehicles. The current commercial lithium-ion battery anode materials are mainly carbon materials, but their theoretical specific capacity is only 372mAh / g, which is increasingly unable to meet the requirements of high-power and high-capacity in the application field of lithium-ion batteries. Therefore, it is extremely urgent to develop new anode materials for lithium-ion batteries with high specific capacity. [0003] Silicon has a high theoretical specific capacity (4200mAh / g), is abundant in the earth, and has low cost, so it is consid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/139H01M4/13
CPCY02E60/10
Inventor 郭玉国徐泉孔一鸣殷雅侠
Owner BEIJING IAMETAL NEW ENERGY TECH CO LTD
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