Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of preparation method of porous nanometer silicon carbon composite material

A carbon composite material and nano-silicon technology, which is applied in the preparation/purification of carbon, silicon compounds, chemical instruments and methods, etc., can solve the problems of complex process, risk of explosion, poor charge and discharge performance, etc., and achieve low preparation cost and no The effect of environmental pollution and simple process

Active Publication Date: 2021-06-29
XUCHANG UNIV
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Graphite, as a commonly used negative electrode material for commercial lithium-ion batteries, has a theoretical specific capacity of only 372mAh g -1 , and the charge and discharge performance is poor at high rates, and the stability in the dielectric is also poor, which can no longer meet the development needs of energy storage materials; for this reason, silicon is used as an abundant element material and it has a capacity of 4200mAh·g -1 With many advantages such as ultra-high theoretical specific capacity and low charge-discharge voltage, it has become the best choice for future high-energy-density power battery storage materials. However, silicon materials have large volume changes during charge-discharge processes. As a result, its cycle stability is poor. In order to overcome this problem, some methods such as alloying of silicon, silicon composite materials, and nanonization of silicon have been developed, especially the compounding of silicon and carbon materials, combining the advantages of the two materials , can greatly improve the cycle stability of silicon-based materials. However, the current methods for preparing nano-silicon-carbon composite materials mainly include gas cracking method, direct mixing method, etc. These methods have the disadvantages of explosion risk, environmental pollution, complicated process and high cost. Greatly limit the application process of silicon carbon composite materials

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of porous nanometer silicon carbon composite material
  • A kind of preparation method of porous nanometer silicon carbon composite material
  • A kind of preparation method of porous nanometer silicon carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for preparing a porous nano-silicon-carbon composite material, comprising the steps of:

[0036] Step 1, put raw talc powder into a corundum crucible, and then put it into a tube furnace for calcination. The process of calcining raw talc powder is as follows: the heating rate is 4°C / min, the holding temperature is 700°C, and the holding time is 100 minutes. Cool down to 300°C at a cooling rate of 15°C / min and then cool with the furnace to obtain calcined talc powder D1;

[0037] Step 2, fully mix the D1 prepared in step 1 according to the mass ratio of D1 and magnesium powder of 1:1, and use dry pressing to form at 50MPa, hold the pressure for 10min and press it into a block to obtain the mixed block material MD1;

[0038] Step 3, put the MD1 prepared in step 2 into a corundum crucible, and calcine it in six stages in a tube furnace, which are: the first stage—rising from room temperature to 600°C, the second stage—in 600 ° C for 3 hours, the third stage - aft...

Embodiment 2

[0042] A method for preparing a porous nano-silicon-carbon composite material, comprising the steps of:

[0043] Step 1, put raw talc powder into a corundum crucible, and then put it into a tube furnace for calcination. The process of calcining raw talc powder is as follows: the heating rate is 5°C / min, the holding temperature is 720°C, and the holding time is 90 minutes. Reduce the temperature to 300°C at a cooling rate of 4°C / min and then cool with the furnace to obtain calcined talc powder D1;

[0044] Step 2, fully mix the D1 prepared in step 1 according to the mass ratio of D1 and magnesium powder of 1:3, and use dry pressing at 200MPa, hold the pressure for 3min and press into a block to obtain the mixed block material MD1;

[0045]Step 3, put the MD1 prepared in step 2 into a corundum crucible, and calcine it in six stages in a tube furnace, which are: the first stage—rising from room temperature to 620°C, the second stage—in 620°C heat preservation for 2.5h, the third...

Embodiment 3

[0049] A method for preparing a porous nano-silicon-carbon composite material, comprising the steps of:

[0050] Step 1, put raw talc powder into a corundum crucible, and then put it into a tube furnace for calcination. The process of calcining raw talc powder is as follows: the heating rate is 4°C / min, the holding temperature is 680°C, and the holding time is 150 minutes. Reduce the temperature to 300°C at a cooling rate of 4°C / min and then cool with the furnace to obtain calcined talc powder D1;

[0051] Step 2, fully mix the D1 prepared in step 1 according to the mass ratio of D1 and magnesium powder of 1:1.5, and use dry pressing to form a block at 100MPa, hold the pressure for 5 minutes, and press it into a block to obtain the mixed block material MD1;

[0052] Step 3, put the MD1 prepared in step 2 into a corundum crucible, and calcine it in six stages in a tube furnace, which are: the first stage—rising from room temperature to 630°C, the second stage—in 630°C for 2 ho...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a preparation method of a porous nanometer silicon-carbon composite material, belonging to the technical field of preparation methods of functional nanomaterials. , place the pressed block in a program-controlled high-temperature tube furnace, and obtain the crude porous nano-silicon-carbon composite material by segmented heating. The drying process obtains the porous nano-silicon-carbon composite material; the preparation method of the invention has the advantages of simple process, low price of raw materials, low preparation cost, no environmental pollution and safety, and the prepared porous nano-silicon-carbon composite material has uniform nano-hole structure, silicon ‑The proportion of carbon materials can be adjusted without impurities, which can be used in the field of energy storage materials.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of functional nanometer materials, and in particular relates to a preparation method of porous nanometer silicon-carbon composite materials. Background technique [0002] Graphite, as a commonly used negative electrode material for commercial lithium-ion batteries, has a theoretical specific capacity of only 372mAh g -1 , and the charge and discharge performance is poor at high rates, and the stability in the dielectric is also poor, which can no longer meet the development needs of energy storage materials; for this reason, silicon is used as an abundant element material and it has a capacity of 4200mAh·g -1 With many advantages such as ultra-high theoretical specific capacity and low charge-discharge voltage, it has become the best choice for future high-energy-density power battery storage materials. However, silicon materials have large volume changes during charge-discharge proces...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05C01B33/021H01M4/36H01M4/38H01M4/62
CPCC01B33/021C01B32/05H01M4/362H01M4/386H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 朱聪旭张博文武玺旺徐晓敏崔灿岳红伟李婷婷铁伟伟何伟伟郑直
Owner XUCHANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com