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A kind of n-doped porous silicon-based composite material and its preparation method and application

A composite material and porous silicon-based technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of volume effect and poor conductivity, achieve volume effect suppression, buffer volume effect, improve cycle stability and rate performance Effect

Active Publication Date: 2021-09-17
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the problems of volume effect and poor conductivity in the charging and discharging process of silicon-based materials. The present invention provides a method for preparing an N-doped porous silicon-based composite material, which includes the following The above steps:

Method used

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  • A kind of n-doped porous silicon-based composite material and its preparation method and application
  • A kind of n-doped porous silicon-based composite material and its preparation method and application
  • A kind of n-doped porous silicon-based composite material and its preparation method and application

Examples

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Embodiment 1

[0046] Add 3g of aminopropyltriethoxysilane to 20g of n-hexane, mix and stir for 2h, then add 1.5ml of HCl solution with a concentration of 12wt% while stirring, then add 1g of deionized water dropwise, Reflux and stir at 60°C for 30 hours, then evaporate the solvent to dryness. During the evaporation process, first use a water separator to remove ethanol and water generated in the reaction process, and finally evaporate all the n-hexane to dryness to obtain a white solid powder. Heat treatment with 95wt% argon gas at 900°C for 1h, cool to room temperature, the heating rate is 5°C / min, the airflow speed is 200ml / min, and finally treat with 10wt% HF for 30min, filter and wash until neutral That is, the N-doped porous silicon-based composite material (N-Si / SiO x Composite material, x is 0-2), denoted as S1.

[0047] figure 1 It is the N-Si / SiO obtained in Example 1 x In the XRD spectrum of the composite material, there is no diffraction peak of crystalline silicon in the spec...

Embodiment 2

[0051] Add 3g of aminopropyltriethoxysilane to 20g of n-hexane, mix and stir for 2h, then add 3ml of NaOH solution with a concentration of 5wt% while stirring, then add 1g of deionized water dropwise, at 60 Reflux and stir at ℃ for 30 h, then evaporate the solvent to dryness, first use a water separator to remove the ethanol and water generated in the reaction process, and finally evaporate all the n-hexane to obtain a white solid powder. Heat treatment at 900°C for 1h under 95wt% argon mixed gas atmosphere, cool to room temperature, the heating rate is 5°C / min, the airflow speed is 200ml / min, and finally treat with 10wt% HF for 30min, filter and wash until neutral Obtain N-doped porous silicon-based composites (N-Si / SiO x Composite materials, x is 0-2), denoted as S2.

[0052] image 3 It is the N-Si / SiO obtained in Example 2 x SEM images of composite materials. It can be seen from the figure that the synthesized composite material has an irregular shape with obvious edge...

Embodiment 3

[0055] Add 3g of aminopropyltriethoxysilane to 20g of n-hexane, mix and stir for 2h, then add 3ml of NaOH solution with a concentration of 5wt% while stirring, then add 1g of deionized water dropwise, at 60 Reflux and stir at ℃ for 30 hours, then add 0.8g of magnesium powder, and then evaporate the solvent to dryness. During the evaporation process, first use a water separator to remove the ethanol and water generated during the reaction, and finally evaporate all the n-hexane to dryness to obtain a white solid The powder was heat-treated at 900°C for 1h in a mixed gas atmosphere of 5wt% hydrogen and 95wt% argon, cooled to room temperature, the heating rate was 5°C / min, and the air flow rate was 200ml / min, and finally treated with 18wt% HCl and 10wt% HF After 30min, after filtering and washing to neutrality, the N-doped porous silicon-based composite material (N-Si / SiO x Composite materials, x is 0-2), denoted as S3.

[0056] Figure 4 It is the N-Si / SiO obtained in Example ...

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Abstract

The present invention provides an N-doped porous silicon-based composite material, a preparation method and application thereof, wherein the N source in the porous silicon-based composite material is an organosiloxane monomer containing one or more branched amino-hydrocarbon groups , that is derived from the amino hydrocarbon branch chain in the organosiloxane monomer, the doping of the N element significantly improves the conductivity of the porous silicon-based composite material. In the preparation process of the porous silicon-based composite material, a reducing agent is optionally added, and the addition of the reducing agent promotes the reduction of the silicon oxide formed by the organosiloxane monomer as a precursor, so that the generated Si crystals are reduced. The grains are embedded in a matrix of unreduced silicon oxide, which buffers the volume effect of the Si grains during charge and discharge. The porous silicon-based composite material is etched by HF during the preparation process, and a large number of voids are formed inside the composite material to form a porous silicon-based composite material, which also plays the role of buffer volume effect.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an N-doped porous silicon-based composite material and its preparation method and application. Background technique [0002] Lithium-ion secondary batteries have been widely used in modern communications, portable electronics, etc. products and hybrid vehicles. In the process of manufacturing lithium-ion secondary batteries, positive and negative electrode materials are important factors that determine the performance and price of lithium-ion batteries. At present, the anode material of lithium-ion batteries that have been commercialized is mainly graphite, and its maximum theoretical capacity is 372mAh / g, which is difficult to meet the needs of the development of high-performance power lithium-ion batteries. Therefore, it is imperative to develop a new type of anode material . Among various non-carbon anode materials, silicon stands out for its unique advantages...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCY02E60/10
Inventor 王敬王冉陈实苏岳锋吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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