Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of silicon carbon composite material, its preparation method and application

A silicon-carbon composite material and nano-silicon technology, which is applied to active material electrodes, structural parts, electrical components, etc., can solve the problem of high cost of negative electrode silicon-carbon materials, and achieve the effects of high consistency, low cost and simple preparation process.

Active Publication Date: 2021-09-17
SVOLT ENERGY TECHNOLOGY CO LTD
View PDF12 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of lithium-ion secondary battery negative electrode silicon-carbon material obtained by the method is high

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 silicon carbon composite material, its preparation method and application
  • A kind of silicon carbon composite material, its preparation method and application
  • A kind of silicon carbon composite material, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A method for preparing a silicon-carbon composite material comprises the steps of:

[0058] (1) Preparation of porous nano-silicon:

[0059] Use a disc chipper to eliminate scrapped solar silicon panels to a particle size of 800 μm, then sand-grind and classify by a mechanical mill to obtain nano-silicon with a particle size of 100 nm, and then use ethanol and deionized water (volume ratio 1 : 1) carry out ultrasonic cleaning, filter, then transfer to 0.1mol / L hydrofluoric acid and soak for 12h, and use deionized water to clean, dry to obtain porous nano-silicon;

[0060] (2) Preparation of silicon-carbon composite materials:

[0061] Add 1g of vinyltriethoxysilane to 20mL of carbon tetrachloride organic solvent to form a solution, then add 3g of porous nano-silicon, 1g of polyethylene glycol and 1g of silicon chloride, mix well, ultrasonically disperse for 6h, and then filter Solid product and transfer to tube furnace;

[0062] Calcination: In an inert atmosphere, h...

Embodiment 2

[0065] A method for preparing a silicon-carbon composite material comprises the steps of:

[0066] (1) Preparation of porous nano-silicon:

[0067] Use a disc chipper to eliminate scrapped solar silicon panels to a particle size of 500 μm, then sand-grind and classify by a mechanical mill to obtain nano-silicon with a particle size of 50 nm, and then use ethanol and deionized water (volume ratio 1:1) Ultrasonic cleaning, filtering, then transferring to 0.5mol / L hydrofluoric acid for immersion for 1h, and cleaning with deionized water, drying to obtain porous nano-silicon;

[0068] (2) Preparation of silicon-carbon composite materials:

[0069] Add 0.5g of vinyltrimethoxysilane to 50mL of N-methylpyrrolidone organic solvent to form a solution, then add 1g of porous nano-silicon, 0.5g of polyvinyl alcohol and 0.5g of silicon tetrabromide and mix well, then ultrasonically disperse for 1h , after which the solid product was filtered and transferred to a tube furnace;

[0070] C...

Embodiment 3

[0072] A method for preparing a silicon-carbon composite material comprises the steps of:

[0073] (1) Preparation of porous nano-silicon:

[0074] Use a disc chipper to eliminate scrapped solar silicon panels to a particle size of 1000 μm, then sand-grind and classify through a mechanical mill to obtain nano-silicon with a particle size of 200 nm, and then use ethanol and deionized water (volume ratio) successively 1:1) ultrasonically cleaned, filtered, then transferred to 0.1mol / L hydrofluoric acid and soaked for 24 hours, washed with deionized water, and dried to obtain porous nano-silicon;

[0075] (2) Preparation of silicon-carbon composite materials:

[0076] Add 2g of vinyl tris(β-methoxyethoxy)silane to 200mL N,N-dimethylformamide organic solvent to form a solution, then add 5g of porous nano-silicon, 2g of polyvinyl alcohol and 2g of chloride After the silicon is evenly mixed, ultrasonically disperse for 12 hours, then filter and transfer to a tube furnace;

[0077...

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 diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention relates to a silicon-carbon composite material, its preparation method and application. The method comprises the following steps: (1) mechanically treating scrapped solar panels to obtain nano-silicon, and then chemically corroding the nano-silicon to obtain porous nano-silicon; The dispersion liquid of the coupling agent is filtered; (3) under an inert atmosphere, the solid product obtained by filtering in step (2) is calcined to obtain a silicon-carbon composite material. In the present invention, porous nano-silicon is obtained by processing low-cost scrapped solar silicon panels, and then reacts with a silane coupling agent under high temperature conditions to prepare a silicon-carbon composite material, and a synergistic effect is generated between the silane coupling agent and nano-silicon, namely The surface hydrolysis of the silane coupling agent on the nano-silicon surface generates silicon hydroxyl groups, and the silicon-carbon composite material absorbs electrons to form a complex with a stable structure, thereby improving the electrochemical performance of the lithium-ion battery.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a silicon-carbon composite material, its preparation method and application. Background technique [0002] According to the national new energy vehicle development plan, the new energy vehicle industry has put forward higher requirements for the energy density of lithium-ion batteries. For lithium-ion batteries, the anode material is an important component and an important factor affecting the energy density of the battery. [0003] The currently marketed anode materials are mainly graphite materials, but the low gram capacity of graphite materials limits the improvement of the energy density of lithium-ion batteries. The silicon anode material has attracted the attention of researchers due to its high gram capacity and abundant resources, and has been applied in high specific energy density lithium-ion batteries and other fields. However, the high expansion rate ...

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): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/587H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 赵晓锋
Owner SVOLT ENERGY TECHNOLOGY CO LTD