Spherical porous silicon/carbon composite material as well as preparation method and application thereof

A silicon-carbon composite material and carbon composite material technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of high cost, unsuitable for industrialization, complicated operation, etc., and achieve low cost, easy to enlarge, and improve stability. sexual effect

Inactive Publication Date: 2017-05-24
ZHONGTIAN ENERGY STORAGE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is complicated to operate, and the CVD method is adopted, which has high cost and is not suitable for industrialization.

Method used

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  • Spherical porous silicon/carbon composite material as well as preparation method and application thereof
  • Spherical porous silicon/carbon composite material as well as preparation method and application thereof
  • Spherical porous silicon/carbon composite material as well as preparation method and application thereof

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preparation example Construction

[0032] A method for preparing a spherical porous silicon-carbon composite material, the specific steps are as follows:

[0033] (1) A certain proportion of SiO x The powder and asphalt powder are added to the VCJ heating mixer and stirred for a period of time, and then the temperature is raised under an inert atmosphere for coating; SiO x The average particle size of the powder is 5-20μm; the asphalt powder is petroleum pitch or coal tar pitch, the average particle size is 2-10μm; SiO x The mass percentage of powder and pitch powder is 60-90:1-40; the stirring speed is 60-100rpm, and the stirring time is 0.5-3h; the inert gas is one of nitrogen, argon, helium, and neon; the heating rate is 1- 5°C / min, the heating end point is 200-500°C, and the holding time is 1-5h.

[0034] (2) The coated material is heat-treated at high temperature for a period of time under an inert atmosphere and sieved to obtain SiO x / C matrix; the inert atmosphere is one of nitrogen, argon, helium, an...

Embodiment 1

[0040] Preparation of silicon-carbon composite materials: Add 2.4 kg of SiOx powder with an average particle size D50 of 6 μm and 0.6 kg of petroleum pitch powder with an average particle size D50 of 2.5 μm into the VCJ heating mixer, start stirring and pass high-purity nitrogen to remove the air , the rotating speed is 80rpm, the time is 1h, keep stirring, and then raise the temperature to 400°C at a heating rate of 3°C / min for 2h, and collect the asphalt-coated SiOx material. The asphalt-coated SiOx was heat-treated in a nitrogen atmosphere in a box furnace, and the temperature was raised to 1000°C for 5 hours at a rate of 10°C / min and then sieved to obtain the heat-treated SiOx / C material. Get 500g of heat-treated SiOx / C material and wet grind it with a stirring ball mill, using ethanol as a solvent, with a solid content of 15%, a rotating speed of 260rpm, and a grinding time of 3h. μm artificial graphite, 30g of conductive agent Super-p and 3000g of ethanol were added into...

Embodiment 2

[0047] Embodiment 2 Change "0.6kg petroleum asphalt powder" in embodiment 1 to "0.3kg petroleum asphalt powder", and the others remain unchanged.

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Abstract

The invention discloses a spherical porous silicon/carbon composite material as well as a preparation method and application thereof. The spherical porous silicon/carbon composite material is structurally characterized in that a SiOx/C matrix, graphite with small particle size and a conductive agent are dispersed in porous amorphous carbon, wherein the average particle diameter is 12-25mu m; the method comprises the following steps of carrying out first coating on a SiOx raw material with powder pitch, and performing heat treatment so as to obtain a SiOx/C material; then performing ball milling by use of a wet method so as to reduce the particle diameter of powder, adding a carbon source adhesive, the graphite with the small particle diameter and the conductive agent, and performing high-speed dispersion, thereby obtaining pulp; and finally performing spray granulation and sintering on the pulp, thereby obtaining the final spherical porous silicon/carbon composite material. According to the invention, SiOx is dispersed in cracking carbon, the graphite and the conductive agent, so that SiOx volume expansion during a charge/discharge process is buffered, and the conductibility is enhanced; by virtue of the porous structure, the imbibition rate and cycle performance of the material can be effectively improved; by virtue of bitumencarb coating and high-heat treatment performed in advance, SiOx is prevented from being directly contacted with an electrolyte, and furthermore, the stability and first efficiency of the silicon/carbon material are improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a spherical porous silicon-carbon composite material and a preparation method and application thereof. Background technique [0002] In recent years, with the acceleration of the new energy vehicle industry, power batteries have quickly become a hot spot for investment in the business community. It is imminent to develop high-performance, high-safety, and low-cost lithium-ion power batteries with independent intellectual property rights. The anode material is one of the key factors determining its performance. Currently researched and developed anode materials for lithium-ion batteries mainly include carbon materials and non-carbon materials. Among non-carbon anode materials, silicon materials have higher theoretical specific capacity (Li 22 Si 5 : 4200mAh / g) and lower lithium intercalation potential (vs Li + / Li), and silicon is a very promising anode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M4/62H01M4/621H01M4/625Y02E60/10
Inventor 贺劲鑫郑媛媛靳承铀薛驰缪永华
Owner ZHONGTIAN ENERGY STORAGE TECH
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