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Preparation method of silicon carbon-carbon nanotube composite microsphere negative electrode material for lithium ion battery

A carbon nanotube composite and lithium-ion battery technology, which is applied in the direction of carbon nanotubes, battery electrodes, nanocarbons, etc., can solve the problems of large specific surface area of ​​nanomaterials, unfavorable industrial application, and agglomeration

Active Publication Date: 2020-10-30
山西北科乾通储能科技研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the large specific surface area of ​​nanomaterials will cause serious agglomeration and low tap density, which is not conducive to industrial applications.

Method used

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  • Preparation method of silicon carbon-carbon nanotube composite microsphere negative electrode material for lithium ion battery
  • Preparation method of silicon carbon-carbon nanotube composite microsphere negative electrode material for lithium ion battery
  • Preparation method of silicon carbon-carbon nanotube composite microsphere negative electrode material for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Prepare a mixed solution containing 10mL water and 80mL ethanol, add 3mL ammonia water and stir evenly, then quickly add 6mL tetraethyl orthosilicate, stir for 2 hours to obtain hydrophilic nano-SiO 2 and centrifugal drying;

[0023] (2) 500mg of hydrophilic nano-SiO 2 Disperse 5mg of hydroxylated carbon nanotubes in 10mL of water and ultrasonically disperse to obtain a dispersion; measure 30mL of octadecene and 100mg of Hypermer2296 and stir evenly to obtain an oil phase; add the dispersion dropwise to the oil phase and use a homogenizer at high speed Stir for 2min, incubate at 98°C for 3h, and dry by centrifugation to obtain SiO 2 - Carbon nanotube composite microspheres;

[0024] (3) will get SiO 2 - Carbon nanotube composite microspheres and potassium chloride are mixed according to the mass ratio of 1:21, and then SiO is added 2 50% by mass of magnesium powder, ground and mixed, under the protection of hydrogen-argon mixed gas, heated to 600 ° C, kept for 1...

Embodiment 2

[0032] (1) Prepare a mixed solution containing 10mL water and 80mL ethanol, add 3mL ammonia water and stir evenly, then quickly add 6mL tetraethyl orthosilicate, stir for 2 hours to obtain hydrophilic nano-SiO 2 and centrifugal drying;

[0033] (2) 300mg of hydrophilic nano-SiO 2Disperse 40mg of carboxylated carbon nanotubes in 10mL of water and ultrasonically disperse to obtain a dispersion; measure 40mL of octadecene and 90mg of Hypermer2524 and stir evenly to obtain an oil phase; add the dispersion to the oil phase, and use a homogenizer at high speed Stir for 3 minutes, incubate at 99°C for 3 hours, and dry by centrifugation to obtain SiO 2 - Carbon nanotube composite microspheres;

[0034] (3) will get SiO 2 - Carbon nanotube composite microspheres and potassium chloride are mixed according to the mass ratio of 1:25, and then SiO is added 2 The magnesium powder with a mass of 80% is ground and mixed, under the protection of hydrogen and argon mixed gas, the temperatur...

Embodiment 3

[0038] (1) Prepare a mixed solution containing 10mL water and 80mL ethanol, add 3mL ammonia water and stir evenly, then quickly add 6mL tetraethyl orthosilicate, stir for 2 hours to obtain hydrophilic nano-SiO 2 and centrifugal drying;

[0039] (2) 500mg of hydrophilic nano-SiO 2 Disperse 100mg of carboxylated carbon nanotubes in 8mL of water and ultrasonically disperse to obtain a dispersion; measure 40mL of octadecene and 80mg of Hypermer B-210 and stir evenly to obtain an oil phase; add the dispersion dropwise to the oil phase, and use Stir at high speed for 2 minutes with a quality machine, keep warm at 100°C for 3 hours, and centrifugally dry to obtain SiO 2 - Carbon nanotube composite microspheres;

[0040] (3) will get SiO 2 - Carbon nanotube composite microspheres and potassium chloride are mixed according to the mass ratio of 1:25, and then SiO is added 2 The magnesium powder with a mass of 90% is ground and mixed, under the protection of hydrogen and argon mixed ...

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Abstract

The invention provides a preparation method of a silicon carbon-carbon nanotube composite micro-bead anode material for lithium ion batteries, which belongs to the field of lithium ion battery anode materials. The preparation method specifically comprises the steps as follows: preparing silicon-carbon nanotube composite micro-beads by mixing nano-silica and carbon nanotubes; obtaining porous silicon-carbon nanotube composite micro-beads through magnesiothermic reduction; and coating a layer of organic carbon source with dopamine hydrochloride, and obtaining a carbon-coated silicon carbon-carbon nanotube composite micro-bead anode material through pyrolysis. The composite anode material is based on porous nano-silicon of which the surface is coated with a carbon layer. Carbon nanotubes penetrate and interlace inside and on the surfaces of micro-beads to form a unique multi-level conductive network, which improves the conductivity of the material. The material has high specific capacity,and the cycle life of the material is comprehensively improved.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to a preparation method of silicon carbon-carbon nanotube composite microsphere negative electrode materials for lithium ion batteries. Background technique [0002] With the rapid development of the 3C industry, lithium-ion batteries used as power supply have also become a promising sunrise industry. Lithium-ion batteries have the advantages of high energy density, long cycle life, less self-discharge, fast charging speed, and environmental friendliness. They are currently the fastest growing secondary batteries with the best market prospects. At the same time, energy consumption is increasing and environmental pollution is becoming more and more serious. Therefore, environmentally friendly and pollution-free new energy vehicles have attracted extensive attention from governments and enterprises in various countries. Power...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/38H01M10/0525C01B32/158
CPCC01B32/158H01M4/366H01M4/38H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 李平何冬林王天颖赵汪安富强曲选辉
Owner 山西北科乾通储能科技研究院有限公司