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A kind of preparation method of carbon-silicon composite material with mesoporous structure

A composite material and mesoporous structure technology, applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of restraint, limited incremental change of specific capacity, poor cycle stability, etc., and achieve good stability and good stability. Dispersion effect, effect of large specific capacity

Active Publication Date: 2021-10-22
贵州省兴隆碳素有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The specific surface of the porous structure can be combined with carbon materials to increase the specific capacity of the carbon-silicon structure, but limited by the specific surface area, the incremental change of the specific capacity is limited, and the cycle stability is not good

Method used

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  • A kind of preparation method of carbon-silicon composite material with mesoporous structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing a mesoporous carbon-silicon composite material, comprising the steps of:

[0032] Step 1, putting the silicon-based mesoporous material into absolute ethanol for 10 minutes of ultrasonic reaction to obtain a suspension;

[0033] Step 2, adding high-substituted hydroxypropyl cellulose into the suspension and stirring until completely dissolved, then ultrasonically reacting at a constant temperature for 2 hours to obtain a suspension dispersion;

[0034] Step 3, adding distilled water to the suspension dispersion liquid and stirring evenly, then reacting by distillation under reduced pressure for 2 hours, and reacting with ultrasonic at constant temperature for 20 minutes to obtain a suspension aqueous solution;

[0035] Step 4, put the suspended aqueous solution into the reaction kettle and let it stand for heating for 20 minutes, and filter while it is hot to obtain mixed precipitation;

[0036] Step 5, put the mixed precipitate into an oxygen-fr...

Embodiment 2

[0046] A method for preparing a mesoporous carbon-silicon composite material, comprising the steps of:

[0047] Step 1, putting the silicon-based mesoporous material into absolute ethanol for 30 minutes of ultrasonic reaction to obtain a suspension;

[0048] Step 2, adding high-substituted hydroxypropyl cellulose into the suspension and stirring until completely dissolved, then ultrasonically reacting at a constant temperature for 4 hours to obtain a suspension dispersion;

[0049] Step 3, adding distilled water to the suspension dispersion liquid and stirring evenly, then reacting by distillation under reduced pressure for 4 hours, and reacting with ultrasonic at constant temperature for 50 minutes to obtain a suspension aqueous solution;

[0050] Step 4, put the suspended aqueous solution into the reaction kettle and let it stand for heating for 50 minutes, and filter while it is hot to obtain mixed precipitation;

[0051] Step 5, put the mixed precipitate into an oxygen-fr...

Embodiment 3

[0061] A method for preparing a mesoporous carbon-silicon composite material, comprising the steps of:

[0062] Step 1, putting the silicon-based mesoporous material into absolute ethanol for 20 minutes of ultrasonic reaction to obtain a suspension;

[0063] Step 2, adding high-substituted hydroxypropyl cellulose into the suspension and stirring until completely dissolved, then ultrasonically reacting at a constant temperature for 3 hours to obtain a suspension dispersion;

[0064] Step 3, adding distilled water to the suspension dispersion liquid and stirring evenly, then reacting by distillation under reduced pressure for 3 hours, and reacting with ultrasonic at constant temperature for 40 minutes to obtain a suspension aqueous solution;

[0065] Step 4, put the suspended aqueous solution into the reaction kettle and let it stand for heating for 40 minutes, and filter while it is hot to obtain mixed precipitation;

[0066] Step 5, put the mixed precipitate into an oxygen-fr...

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Abstract

The invention belongs to the field of carbon-silicon composite materials, and specifically relates to a method for preparing a carbon-silicon composite material with a mesoporous structure, comprising the following steps: Step 1, putting the silicon-based mesoporous material into absolute ethanol for ultrasonic reaction for 10-30min, Obtain a suspension; step 2, add high-substituted hydroxypropyl cellulose into the suspension and stir until it is completely dissolved, then conduct a constant temperature ultrasonic reaction for 2‑4h to obtain a suspension dispersion; step 3, add distilled water to the suspension Stir evenly in the dispersion, then distill under reduced pressure for 2-4 hours, and conduct ultrasonic reaction at a constant temperature for 20-50 minutes to obtain a suspended aqueous solution; step 4, put the suspended aqueous solution in a reaction kettle and let it stand for heating for 20-50 minutes, then filter while it is hot to obtain Mixed precipitation; Step 5, putting the mixed precipitation into an oxygen-free atmosphere for heat treatment for 8‑10 hours to obtain a carbon-silicon composite material with a mesoporous structure. The carbon-silicon composite material prepared by the invention has large specific surface area, large specific capacity and good stability.

Description

technical field [0001] The invention belongs to the field of carbon-silicon composite materials, and in particular relates to a method for preparing a carbon-silicon composite material with a mesoporous structure. Background technique [0002] Silicon can be used as a negative electrode active material for lithium-ion batteries instead of graphite, which has higher specific capacity. However, silicon materials undergo huge volume changes during charging and discharging, and the resulting mechanical stress leads to pulverization of active materials, structural collapse, repeated interface construction, and detachment between materials and current collectors, resulting in rapid capacity fading and reduced battery cycle performance. [0003] Nanostructuring silicon materials and then combining them with carbon nanomaterials to construct carbon-silicon nanocomposites can effectively solve the problem of structure and surface interface instability caused by the volume expansion e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCH01M4/364H01M4/386H01M4/587H01M4/628H01M10/0525Y02E60/10
Inventor 祝良荣杨建青
Owner 贵州省兴隆碳素有限公司