Carbon-coated silicon nanosheet, silicon-based composite and preparation methods of carbon-coated silicon nanosheet and silicon-based composite

A silicon-based composite material, silicon nanosheet technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as poor cycle performance

Inactive Publication Date: 2019-04-26
河南电池研究院有限公司 +1
View PDF5 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have improved the cycle performance of silicon materials and silicon composites to a certai

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
  • Carbon-coated silicon nanosheet, silicon-based composite and preparation methods of carbon-coated silicon nanosheet and silicon-based composite
  • Carbon-coated silicon nanosheet, silicon-based composite and preparation methods of carbon-coated silicon nanosheet and silicon-based composite
  • Carbon-coated silicon nanosheet, silicon-based composite and preparation methods of carbon-coated silicon nanosheet and silicon-based composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of carbon-coated silicon nanosheets:

[0034] Step 1: Add 0.1 g of sucrose to 5 mL of water, fully stir and ultrasonically disperse for 10 min; add 0.1 g of silica powder with a D50 particle size of 10 nm, and ultrasonically disperse for 10 min;

[0035] Step 2: The mixture obtained in step 1 is subjected to a hydrothermal reaction in a closed container, the reaction temperature is 100 ° C, and the reaction time is 10 hours;

[0036] Step 3: the hydrothermal reaction product is centrifuged, and the obtained solid matter is vacuum-dried at 60°C;

[0037] Step 4: grinding and calcining the dried solid. During calcination, the heating rate is 10°C / min, the calcination temperature is 500°C, and the calcination time is 5 hours to obtain carbon-coated silicon nanosheets.

[0038] figure 1 The XRD patterns of the carbon-coated silicon nanosheets prepared in this example are obtained from figure 1 The XRD results can confirm that the main component of the prepare...

Embodiment 2

[0046] Preparation of carbon-coated silicon nanosheets:

[0047] Step 1: Add 0.5g of asphalt to 15mL of water, fully stir and ultrasonically disperse for 20min; add 0.5g of silica fume with a D50 particle size of 50nm, and ultrasonically disperse for 20min;

[0048] Step 2: The mixture obtained in step 1 is subjected to a hydrothermal reaction in a closed container, the reaction temperature is 150 ° C, and the reaction time is 16 hours;

[0049] Step 3: the hydrothermal reaction product is centrifuged, and the obtained solid matter is vacuum-dried at 40°C;

[0050] Step 4: Grinding and calcining the dried solid, the heating rate during calcination is 5°C / min, the calcination temperature is 750°C, and the calcination time is 8 hours to obtain carbon-coated silicon nanosheets.

[0051] Preparation of silicon matrix composites:

[0052] Step 1: The carbon-coated silicon nanosheets prepared above, graphite with a D50 particle size of 40 μm, and polyaniline are mixed in a mass rati...

Embodiment 3

[0055] Preparation of carbon-coated silicon nanosheets:

[0056] Step 1: Add 1g of glucose into 20mL of water, stir well and disperse ultrasonically for 30min; add 1g of silicon powder with a D50 particle size of 200nm, and disperse ultrasonically for 30min;

[0057] Step 2: The mixture obtained in step 1 is subjected to a hydrothermal reaction in a closed container, the reaction temperature is 200 ° C, and the reaction time is 24 hours;

[0058] Step 3: Centrifuge the hydrothermal reaction product, and vacuum dry the obtained solid matter at 80°C;

[0059] Step 4: Grinding and calcining the dried solid, the heating rate during calcination is 3°C / min, the calcination temperature is 1000°C, and the calcination time is 8 hours to obtain carbon-coated silicon nanosheets.

[0060] Preparation of Silicon Matrix Composites::

[0061] Step 1: Mix the carbon-coated silicon nanosheets prepared above, hard carbon with a D50 particle size of 1 μm, and pitch according to a mass ratio of...

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

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method of a carbon-coated silicon nanosheet, and the carbon-coated silicon nanosheet. The preparation method of the carbon-coated silicon nanosheet comprises thesteps: 0.1-1 g of a carbon source is added into 5-20 mL of water to be stirred and ultrasonically dispersed for 10-30 min; 0.1-1 g of silicon powder with the D50 particle size being 10-500 nm is addedto be ultrasonically dispersed for 10-30 min; and a hydrothermal reaction is conducted at 100-200 DEG C for 10-24 h, then centrifuging and vacuum drying are carried out, and the carbon-coated siliconnanosheet is obtained. The carbon-coated silicon nanosheet is prepared from a silicon nanosheet and a carbon layer, wherein the periphery of the silicon nanosheet is coated with the carbon layer. Theinvention discloses a silicon-based composite prepared from the carbon-coated silicon nanosheet, and a preparation method of the silicon-based composite. The preparation method of the silicon-based composite comprises the steps: in percentage by mass, 5-12% of the carbon-coated silicon nanosheet, 78-85% of a carbon material and 10% of a carbon source are mixed and ball-milled, the temperature isincreased to be 500-1000 DEG C at 3-10 DEG C/min to carry out calcining for 5-12 h, and the silicon-based composite is obtained. The silicon-based composite is prepared from the carbon-coated siliconnanosheet, the carbon material and a coating carbon layer. The carbon coating layers of the carbon-coated silicon nanosheet and the silicon-based composite buffer volume expansion of silicon, electrical conductivity is enhanced, the double-coating carbon layer of the silicon-based composite further inhibit expansion of the silicon, the first-time charge and discharge efficiency is improved, and the cycle capacity retention ratio is increased.

Description

technical field [0001] The invention relates to a preparation method of carbon-coated silicon nanosheets and carbon-coated silicon nanosheets, as well as a preparation method of a silicon-based composite material and a silicon-based composite material. Background technique [0002] Lithium-ion batteries have developed rapidly in the industrial field due to their advantages of no memory effect, high energy density and low self-discharge rate. With its application in portable devices and power vehicles, people have put forward higher requirements for anode materials of lithium-ion batteries. At present, graphite is the most commonly used anode material for lithium-ion batteries, which has the advantages of low price, abundant resources, and good kinetics. However, its voltage to lithium is lower than 0.2V (vs. Li / Li+), especially at high rate, this voltage is close to the precipitation potential of lithium, which will cause lithium dendrites, causing great safety problems. I...

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
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 杨书廷张芬丽郑延辉董红玉
Owner 河南电池研究院有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap