Silicon-carbon negative electrode material with artificial SEI film and preparation method and application of silicon-carbon negative electrode material

A negative electrode material, silicon carbon technology, applied in carbon preparation/purification, negative electrode, battery electrode, etc., can solve problems such as poor thermal stability of storage, improve rate performance, improve stability, and reduce the risk of lithium precipitation. Effect

Active Publication Date: 2021-12-28
EVE ENERGY CO LTD
View PDF14 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The SEI film obtained by the disclosed preparation method has poor high-temperature cycle performance and poor storage thermal stability

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
  • Silicon-carbon negative electrode material with artificial SEI film and preparation method and application of silicon-carbon negative electrode material
  • Silicon-carbon negative electrode material with artificial SEI film and preparation method and application of silicon-carbon negative electrode material
  • Silicon-carbon negative electrode material with artificial SEI film and preparation method and application of silicon-carbon negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] This embodiment provides a method for preparing a silicon-carbon negative electrode material with an artificial SEI film, the preparation method comprising the following steps:

[0071] (1) Under the condition of helium, ball mill and mix silicon powder, asphalt and N-methylpyrrolidone for 1.5h to obtain nano-silicon slurry;

[0072] Described silicon powder and asphalt mass ratio are 3:1, and the particle diameter D of described silicon powder 50 8μm;

[0073] The nano-silicon slurry, natural graphite and deionized water were stirred and mixed for 3 hours, and spray-dried to obtain a mixture;

[0074] The mass ratio of described nano-silicon slurry and natural graphite is 1:5, and the particle diameter D of described natural graphite 50 20μm;

[0075] (2) Under helium, roast the mixture described in step (1) for 4.5 hours at 750°C and break it to obtain particle size D 50 12.5μm silicon carbon anode material;

[0076] (3) Perfluoromethyl vinyl ether, maleic anhydr...

Embodiment 2

[0082] This embodiment provides a method for preparing a silicon-carbon negative electrode material with an artificial SEI film, the preparation method comprising the following steps:

[0083] (1) Under the condition of argon, ball mill and mix silicon powder, glucose and tetrahydrofuran for 1 hour to obtain nano-silicon slurry;

[0084] Described silicon powder and glucose mass ratio are 4:1, and the particle diameter D of described silicon powder 50 10μm;

[0085]The nano-silicon slurry, natural graphite and deionized water were stirred and mixed for 2 hours, and spray-dried to obtain a mixture;

[0086] The mass ratio of described nano-silicon slurry and natural graphite is 1:8, and the particle diameter D of described natural graphite 50 10μm;

[0087] (2) Under helium, roast the mixture described in step (1) at 650°C for 5 hours, and break it to obtain particle size D 50 10μm silicon carbon anode material;

[0088] (3) Perfluoromethyl vinyl ether, maleic anhydride an...

Embodiment 3

[0094] This embodiment provides a method for preparing a silicon-carbon negative electrode material with an artificial SEI film, the preparation method comprising the following steps:

[0095] (1) Under the condition of argon, ball mill and mix silicon powder, sucrose and toluene for 2 hours to obtain nano-silicon slurry;

[0096] Described silicon powder and sucrose mass ratio are 2:1, and the particle diameter D of described silicon powder 50 5 μm;

[0097] The nano-silicon slurry, natural graphite and deionized water were stirred and mixed for 4 hours, and spray-dried to obtain a mixture;

[0098] The mass ratio of described nano-silicon slurry and natural graphite is 1:3, and the particle diameter D of described natural graphite 50 25 μm;

[0099] (2) Under argon, roast the mixture described in step (1) at 800°C for 4 hours, and break it to obtain particle size D 50 15μm silicon carbon anode material;

[0100] (3) Perfluoromethyl vinyl ether, maleic anhydride and 2-vi...

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
thicknessaaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to view more

Abstract

The invention provides a silicon-carbon negative electrode material with an artificial SEI film and a preparation method and application of the silicon-carbon negative electrode material, and the preparation method comprises the following steps: mixing a perfluoromethyl vinyl ether/maleic anhydride/2-vinyl-1H-benzimidazole copolymer and a silicon-carbon negative electrode material to obtain a mixed solution, and drying the mixed solution to obtain the silicon-carbon negative electrode material with the artificial SEI film, wherein the perfluoromethyl vinyl ether/maleic anhydride/2-vinyl-1H-benzimidazole copolymer is an artificial SEI film coated on the surface of the silicon-carbon negative electrode material. The copolymer plays a role of an artificial SEI film, has a good lithium ion transmission mechanism, and can reduce the risk of lithium separation, effectively reduce the irreversible capacity of the lithium ion battery and improve the first coulombic efficiency of the lithium ion battery; and the artificial SEI film has high thermal stability, and can greatly improve the stability of high-temperature storage and high-temperature circulation of the silicon negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a silicon-carbon negative electrode material, in particular to a silicon-carbon negative electrode material with an artificial SEI film and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have many advantages such as high energy density and long cycle life, and have become important components of electric vehicles and electronic devices today. At present, among the commonly used anode materials for lithium-ion batteries, graphite materials still dominate, but their specific capacity is only 372mAh / g. Compared with graphite, silicon material (Li 15 Si 4 ) has a theoretical specific capacity of up to 3579mAh / g at room temperature, making it an attractive anode material for next-generation lithium-ion batteries, which is expected to make a breakthrough in improving the energy density of lithium-ion batteries and reducin...

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 Applications(China)
IPC IPC(8): H01M4/1393H01M4/133H01M4/36H01M4/66C01B32/05
CPCH01M4/1393H01M4/133H01M4/366H01M4/667H01M4/663C01B32/05H01M2004/027Y02E60/10
Inventor 谢英朋冀亚娟徐晓霞卢顺利
Owner EVE ENERGY CO LTD
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