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

Preparation method of nanometer silicon-carbon composite negative electrode material for lithium ion battery

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of powdering nano-silicon particle materials, long diffusion and migration paths, and poor electrode conductivity, and achieves a small particle size. , Improve the electrochemical activity, the effect of uniform particle size

Active Publication Date: 2018-11-30
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
View PDF2 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned deficiencies existing in the prior art, the purpose of the present invention is to provide a preparation method of a nano-silicon-carbon composite negative electrode material for a lithium-ion battery, which solves the long diffusion migration path of the existing lithium-ion battery in the charging and discharging process, and the nano-silicon Due to the effect of volume expansion, the particles lead to material pulverization, structure collapse, and detachment from the electrode sheet, which in turn causes problems such as poor electrode conductivity.

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
  • Preparation method of nanometer silicon-carbon composite negative electrode material for lithium ion battery
  • Preparation method of nanometer silicon-carbon composite negative electrode material for lithium ion battery
  • Preparation method of nanometer silicon-carbon composite negative electrode material for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Accurately weigh 2.8g of polyacrylonitrile (PAN) powder, 14.4g of N,N-dimethylformamide (DMF) in a 50ml small beaker, and place it in an oil bath at 50°C for 3h at constant temperature, After the PAN powder is completely dissolved, ultrasonically disperse for 4 hours to obtain an outer layer precursor emulsion with a concentration of 14%, which is ready for use;

[0035] 2) Accurately weigh 0.4g of nano silicon powder (30nm) and 0.03g of Y-aminopropyltriethoxysilane (KH550) and soak in a 50ml small beaker for 5min, then add 2.6g of polymethyl methacrylate (PMMA) After powder and 17.4g N,N-dimethylformamide (DMF), it was placed in a 35°C oil bath and stirred at a constant temperature for 3 hours. After the PMMA powder was completely dissolved, it was ultrasonicated for 2 hours to obtain a concentration of 13%. Inner layer precursor emulsion, ready for use;

[0036] 3) Select two 20ml syringes to absorb the inner layer emulsion and the outer layer emulsion respectivel...

Embodiment 2

[0041] 1) Accurately weigh 2.8g of polyacrylonitrile (PAN) powder, 14.4g of N,N-dimethylformamide (DMF) in a 50ml small beaker, and place it in an oil bath at 50°C for 3h at constant temperature, After the PAN powder is completely dissolved, ultrasonically disperse for 4 hours to obtain an outer layer precursor emulsion with a concentration of 14%, which is ready for use;

[0042] 2) Accurately weigh 0.4g of nano silicon powder (30nm) and 0.03g of Y-aminopropyltriethoxysilane (KH550) and soak in a 50ml small beaker for 5min, then add 2.8g of polyacrylonitrile (PAN) powder, After 14.4g of N,N-dimethylformamide (DMF), it was placed in a 50°C oil bath and stirred at a constant temperature for 3 hours. After the PAN powder was completely dissolved, it was sonicated for 2 hours to obtain an inner layer precursor with a concentration of 14%. Body emulsion, ready to use;

[0043] 3) Select two 20ml syringes to absorb the inner layer emulsion and the outer layer emulsion respectively...

Embodiment 3

[0048] 1) Accurately weigh 2.8g of polyvinylidene fluoride (PVDF) powder, 14.4g of N,N-dimethylformamide (DMF) in a 50ml small beaker, and place it in a 35°C oil bath and stir for 3h After the PVDF powder is completely dissolved, ultrasonically disperse for 4 hours to obtain an outer layer precursor emulsion with a concentration of 14%, which is ready for use;

[0049] 2) Accurately weigh 0.4g of nano silicon powder (30nm) and 0.03g of Y-aminopropyltriethoxysilane (KH550) and soak in a 50 ml small beaker for 5min, then add 2.6g of polymethyl methacrylate (PMMA) After the powder and 17.4g N,N-dimethylformamide (DMF), it was placed in a 35°C oil bath and stirred at a constant temperature for 3 hours. After the PMMA powder was completely dissolved, it was ultrasonically used for 2 hours to obtain a concentration of 12%. Inner layer precursor emulsion, ready for use;

[0050] 3) Select two 20ml syringes to absorb the inner layer emulsion and the outer layer emulsion respectively,...

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
The average diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a nanometer silicon-carbon composite negative electrode material for a lithium ion battery. The preparation method comprises: preparing fiber filamentsfrom an inner layer precursor emulsion and an outer layer precursor emulsion through a coaxial electrospinning technique, and carrying out load freeze-drying-load hot pressing-load heat treatment andtwo carbonization treatment processes to obtain the nanometer silicon-carbon composite negative electrode material. The nanometer silicon-carbon composite negative electrode material has small and even fiber diameters and a large specific surface area. The load heat treatment reduces the thickness of the carbon layer. The nanometer silicon carbon composite negative electrode material has a good specific capacity and cycle performances. The preparation method effectively shortens the diffusion path of lithium ions and solves the problem that the nanometer silicon particles are pulverized through the volume expansion effect and are easy to collapse. The preparation method has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method for preparing a nano-silicon-carbon composite negative electrode material for lithium-ion batteries. Background technique [0002] Lithium-ion batteries have outstanding advantages such as large capacity, high working voltage, long cycle life, strong nuclear power retention capability, wide allowable operating temperature range, green environmental protection and no memory effect. Now they have been widely used in electronic products. The annual market size will reach 1193.1 billion US dollars. Therefore, lithium-ion batteries have broad prospects for energy storage and electric vehicles. [0003] However, at present, the internal impedance of lithium-ion batteries is high, the operating voltage varies greatly, and the cost is high. Special protection circuits are necessary, and the power density and capacity for pure electric vehicles need to ...

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): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 陈建刘平李琳龚勇周孝林辜其隆
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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