Spherical silicon-oxygen-carbon negative electrode composite material and preparation method and application thereof

A technology of composite materials and spherical silicon, which is applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems that the preparation process is not suitable for industrial production, and the charging and discharging efficiency is low, so as to avoid the heat treatment process and control the particle size , the effect of high specific capacity

Inactive Publication Date: 2016-10-12
ZHONGTIAN ENERGY STORAGE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention aims at the fact that silicon, which is an existing silicon-oxygen-carbon composite material, is easily exposed to the electrolyte, so the charging and discharging efficiency is low, and SiO needs to be separately heat-treated. x Due to the defects that th

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  • Spherical silicon-oxygen-carbon negative electrode composite material and preparation method and application thereof
  • Spherical silicon-oxygen-carbon negative electrode composite material and preparation method and application thereof
  • Spherical silicon-oxygen-carbon negative electrode composite material and preparation method and application thereof

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Embodiment 1

[0034] (1) Liquid-phase carbon coating: 250g of 200-mesh SiO purchased x The sample and the dispersant sodium carboxymethyl cellulose with a mass fraction of 1.5% are ground by a sand mill until the particle size is less than 1 μm, the solvent is acetone, and the solid content is 10%, then 250g of natural graphite with an average particle size of 4.7μm and 46g of The polyvinyl alcohol is stirred and dispersed at a high speed, the stirring speed is 500rpm, the time is 0.5h, and then spray-dried and granulated; the inlet temperature of the spray granulator is 220°C, the outlet temperature is 100°C, the frequency of the feeding pump is 10Hz, and the frequency of the materialization disc is 250Hz; the obtained carbon Source coated spherical SiO x / Graphite particles are put into an atmosphere furnace to heat up and sinter, the atmosphere is nitrogen plus 10% hydrogen, the heating rate is 1°C / min, the sintering temperature is 400°C, and the time is 4 hours to obtain amorphous carb...

Embodiment 2

[0043] (1) Liquid-phase carbon coating: 300g of 200-mesh SiO purchased x The sample and the dispersant sodium carboxymethyl cellulose with a mass fraction of 1.5% were ground by a sand mill until the particle size was less than 1 μm, the solvent was acetone, and the solid content was 10%, then 200 g of natural graphite with an average particle size of 4.7 μm and 46 g of The polyvinyl alcohol is stirred and dispersed at a high speed, the stirring speed is 500rpm, the time is 0.5h, and then spray-dried and granulated; the inlet temperature of the spray granulator is 220°C, the outlet temperature is 100°C, the frequency of the feeding pump is 10Hz, and the frequency of the materialization disc is 250Hz; the obtained carbon Source coated spherical SiO x / Graphite particles are placed in an atmosphere furnace to heat up and sinter, the atmosphere is nitrogen plus 10% hydrogen, the heating rate is 1°C / min, the sintering temperature is 500°C, and the time is 4 hours to obtain amorph...

Embodiment 3

[0047] (1) Liquid-phase carbon coating: 200g of 200-mesh SiO purchased x The sample and the dispersant sodium carboxymethyl cellulose with a mass fraction of 1.5% were ground by a sand mill until the particle size was less than 1 μm, the solvent was ethanol, and the solid content was 10%, then 300 g of natural graphite with an average particle size of 4.7 μm and 46 g of The polyvinyl alcohol is stirred and dispersed at a high speed, the stirring speed is 500rpm, the time is 0.5h, and then spray-dried and granulated; the inlet temperature of the spray granulator is 220°C, the outlet temperature is 100°C, the frequency of the feeding pump is 10Hz, and the frequency of the materialization disc is 250Hz; the obtained carbon Source coated spherical SiO x / Graphite particles are placed in an atmosphere furnace to heat up and sinter, the atmosphere is nitrogen plus 10% hydrogen, the heating rate is 1°C / min, the sintering temperature is 400°C, and the time is 6 hours to obtain amorph...

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Abstract

The invention discloses a spherical silicon-oxygen-carbon negative electrode composite material, which is of a three-layer structure comprising an inner layer, an intermediate layer and an outer layer, wherein the inner layer is an SiOx/graphite substrate; the intermediate layer is an amorphous carbon coating layer; the outer layer is a carbon nanotube coating layer; the mass of the inner layer SiOx/graphite substrate accounts for 80%-90% of total mass of the spherical silicon-oxygen-carbon negative electrode composite material; the mass of the intermediate layer amorphous carbon accounts for 5%-10% of total mass of the spherical silicon-oxygen-carbon negative electrode composite material; and the outer layer carbon nanotube accounts for 5%-10% of total mass of the spherical silicon-oxygen-carbon negative electrode composite material. The grain diameter of the adopted SiOx substrate is smaller than 5 microns; the grain diameter is relatively small; intercalation and deintercalation of active substances are facilitated; higher specific capacity can be obtained; meanwhile, a dispersing agent is added when an SiOx sample is ground; and condition that the SiOx with a relatively small grain diameter is agglomerated in quantity to affect the performance is prevented.

Description

technical field [0001] The invention belongs to the field of lithium ion battery negative electrode material preparation and energy storage devices, and specifically relates to [0002] A spherical silicon oxygen carbon negative electrode composite material and its preparation method and application. Background technique [0003] Silicon material can well replace the current commercial graphite material as the negative electrode material of lithium-ion batteries. It has many advantages such as high specific capacity, good safety, non-toxic and non-polluting, and its abundance in the earth's crust is second only to oxygen, with a wide range of sources . Although silicon materials can solve many problems of current commercial carbon anode materials, they also face two serious problems: first, as a semiconductor material, silicon has low electrical conductivity, which leads to a large degree of irreversibility in the process of lithium ion deintercalation. The Coulombic effic...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/0525
CPCH01M4/366H01M4/48H01M4/583H01M10/0525Y02E60/10
Inventor 贺劲鑫周勇岐靳承铀郑媛媛薛驰缪永华赵映军
Owner ZHONGTIAN ENERGY STORAGE TECH
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