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Nanometer silicon/carbon nanotube microsphere/graphite composite structure negative electrode material and preparation method thereof

A technology of carbon nanotube microspheres and composite structures, which is applied in the direction of negative electrodes, structural parts, battery electrodes, etc., to achieve the effect of ensuring uniformity and improving distribution problems

Active Publication Date: 2020-05-19
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, the present invention proposes a nano-silicon / carbon nanotube microsphere / graphite composite structure negative electrode material and its preparation method, which can effectively improve the distribution of nano-silicon, enhance the conductivity of silicon-carbon materials and solve the problem of charging and discharging. volume change problem

Method used

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  • Nanometer silicon/carbon nanotube microsphere/graphite composite structure negative electrode material and preparation method thereof
  • Nanometer silicon/carbon nanotube microsphere/graphite composite structure negative electrode material and preparation method thereof
  • Nanometer silicon/carbon nanotube microsphere/graphite composite structure negative electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] Get 40g carbon nanotubes and 10g resol resin, add the mixed solvent of 400ml ethanol and water, carry out spray drying after stirring for 1h, with the pressure of 100 atmospheres, the material is passed through the atomizer (spray gun), polymerized into atomized particles and The hot air is in direct contact with heat exchange, and the drying is completed in a short time. In the spray drying process, the inlet temperature is set to 150°C, the outlet temperature is set to 100°C, and the speed of the feed peristaltic pump is 8rpm. After spray drying, carbon nanotubes are obtained. Microspheres; At 620°C, silane and acetylene gases with a volume ratio of 5:1 were introduced successively at a rate of 0.6L / min, and deposited for 2 hours to obtain nano-silicon / carbon nanotube microspheres; the prepared nanometer Silicon / carbon nanotube microspheres are mixed with graphite at a mass ratio of 1:8 to obtain a finished product 1 of nano-silicon / carbon nanotube microspheres / graphit...

Embodiment 2

[0030] Get 50g carbon nanotubes and 10g resol resin, add the mixed solvent of 400ml ethanol and water, carry out spray drying after stirring for 1h, with the pressure of 100 atmospheres, the material is passed through the atomizer (spray gun), polymerized into atomized particles and Direct contact with hot air, heat exchange, and complete drying in a short time. In the spray drying process, the inlet temperature is set to 180°C, the outlet temperature is 80°C, and the speed of the feed peristaltic pump is 10rpm. After spray drying, carbon nanotubes are obtained Microspheres; At 700°C, silane and acetylene gases with a volume ratio of 3:1 were introduced successively at a rate of 1.5L / min, and deposited for 5 hours to obtain nano-silicon / carbon nanotube microspheres; the prepared nanometer Silicon / carbon nanotube microspheres are mixed with graphite at a mass ratio of 1:10 to obtain a finished product 2 of nano-silicon / carbon nanotube microspheres / graphite composite negative ele...

Embodiment 3

[0032] Get 30g carbon nanotubes and 10g resol resin, add the mixed solvent of 400ml ethanol and water, carry out spray drying after stirring for 2h, with the pressure of 100 atmospheres, the material is passed through the atomizer (spray gun), polymerized into atomized particles and Direct contact with hot air, heat exchange, and complete drying in a short time. In the spray drying process, the inlet temperature is set to 170°C, the outlet temperature is set to 110°C, and the speed of the feed peristaltic pump is 8rpm. After spray drying, carbon nanotubes are obtained Microspheres; at 1000°C, silane and acetylene gas with a volume ratio of 4:1 were introduced successively at a rate of 0.8L / min, and deposited for 1h to obtain nano-silicon / carbon nanotube microspheres; the prepared nano Silicon / carbon nanotube microspheres are mixed with graphite at a mass ratio of 1:6 to obtain a finished product 3 of nano-silicon / carbon nanotube microspheres / graphite composite structure negativ...

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Abstract

The invention discloses a nanometer silicon / carbon nanotube microsphere / graphite composite structure negative electrode material and a preparation method thereof. After carbon nanotube microspheres are prepared by adopting a spray drying technology, nano silicon particles are deposited in the carbon nanotube microspheres and on the surfaces of the carbon nano tube microspheres through a chemical vapor deposition method by taking the carbon nanotube microspheres as a hard template; spray drying is carried out to enable the disordered carbon nanotubes to form porous carbon nanotube microspheres;and nano silicon / carbon nanotube microspheres are prepared by adopting a chemical vapor deposition method, so that the distribution problem of the nano silicon can be effectively improved, the distribution uniformity of the nano silicon can be ensured, the volume expansion of the nano silicon in the charging and discharging process can be buffered, and the obtained structure of the negative electrode material not only can provide a buffer space for the volume change of the nano silicon, but also can provide a three-dimensional conductive frame for the nano silicon. The gram capacity of a battery prepared from the negative electrode material reaches 500 mAh / g or above and is far higher than the gram capacity (350 mAh / g) of a graphite negative electrode, and the negative electrode materialcan be used for a high-energy-density lithium ion battery, such as a 3C electronic product, and is particularly suitable for electric vehicles and unmanned aerial vehicles.

Description

technical field [0001] The invention belongs to the technical field of electrode material preparation, and in particular relates to a negative electrode material with a nano-silicon / carbon nanotube microsphere / graphite composite structure and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become the most widely used secondary batteries due to their high voltage, long cycle life, no memory effect, and environmental protection. However, most application fields have higher and higher requirements for battery energy density. There are many factors that affect the energy density of lithium-ion batteries, the most important being the specific capacity of the positive and negative active materials. The most widely used negative electrode active material for lithium-ion batteries is graphite material, and the theoretical specific capacity of graphite material is only about 372mAh / g, which limits the improvement of battery energy density. Alth...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 赵红
Owner FOSHAN UNIVERSITY
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