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

Silicon-carbon composite material, preparation method and application thereof, electrode and lithium ion battery,

A silicon-carbon composite material, lithium carbonate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of the cycle performance and rate performance of silicon-based anode materials

Pending Publication Date: 2021-04-16
NINGBO SHANSHAN NEW MATERIAL TECH
View PDF10 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the defect that the cycle performance and rate performance of silicon-based negative electrode materials cannot be taken into account in the prior art, the present invention provides a silicon-carbon composite material, an electrode, a lithium-ion battery and its preparation method and application

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 composite material, preparation method and application thereof, electrode and lithium ion battery,
  • Silicon-carbon composite material, preparation method and application thereof, electrode and lithium ion battery,
  • Silicon-carbon composite material, preparation method and application thereof, electrode and lithium ion battery,

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] A method for preparing a silicon-carbon composite material, comprising the steps of:

[0082] S1. The solvent is NMP-ethanol mixed solvent with a ratio of 10:90. According to 900 parts of solvents, 100 parts of silicon, 3 parts of lithium carbonate, 0.03 parts of single-walled carbon nanotube-NMP slurry (calculated by carbon nanotubes) and 50 parts of flake graphite powder, stir in a high-speed disperser for 0.5 hours;

[0083] Then transfer to the pin-rod type dynamic separation high-energy sand mill for sand grinding. The sand mill adopts yttrium oxide stabilized zirconia balls with a diameter of 0.5mm, and the speed adopts 98% of the design speed of the equipment, and the sand mill is continuous for 2 hours;

[0084] Then add 100 parts of novolac resin, 9 parts of hexamethylenetetramine, 8 parts of PVA 1788, 5 parts of PVP K30, and sand again for 2 hours to obtain a sand-milled homogeneous slurry;

[0085] Finally, the slurry was transferred to an ultrasonic machine...

Embodiment 2

[0090] Except adding 5 parts of lithium carbonate and 0.1 part of single-walled carbon nanotube-NMP slurry (calculated as carbon nanotubes) in step S1, other steps and conditions were the same as in Example 1.

Embodiment 3

[0092] A method for preparing a silicon-carbon composite material, comprising the steps of:

[0093] S1. The solvent is NMP-ethanol mixed solvent with a ratio of 10:90. According to 900 parts of solvents, 100 parts of silicon, 5 parts of lithium carbonate, 0.03 parts of single-walled carbon nanotube-NMP slurry (in terms of carbon nanotubes) and 10 parts of flake graphite powder, stir in a high-speed disperser for 0.5 hours;

[0094] Then transfer to the pin-rod type dynamic separation high-energy sand mill for sand grinding. The sand mill adopts yttrium oxide stabilized zirconia balls with a diameter of 0.5mm, and the speed adopts 98% of the design speed of the equipment, and the sand mill is continuous for 2 hours;

[0095] Then add 40 parts of flake graphite powder, 100 parts of novolac resin, 9 parts of hexamethylenetetramine, 8 parts of PVA 1788, 5 parts of PVP K30, and sand mill for 1 hour to obtain sand mill homogeneous slurry;

[0096] Finally, the slurry was transferr...

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
diameteraaaaaaaaaa
lengthaaaaaaaaaa
softening pointaaaaaaaaaa
Login to View More

Abstract

The invention discloses a silicon-carbon composite material, a preparation method and application thereof, an electrode and a lithium ion battery. The preparation method comprises the following steps: S1, homogenizing raw materials to obtain slurry, wherein the raw materials comprise the following components in parts by weight: 100 parts of silicon, 0.005-1 part of carbon nanotubes, graphite and / or graphene, 0-10 parts of a lithium supplementing additive, 10-200 parts of resin and a solvent, and the homogenizing step comprises sanding; S2, carrying out spray drying on the slurry to obtain a precursor A; S3, performing heat treatment on the precursor A to obtain a precursor B; and S4, carrying out heat treatment on the precursor B. According to the invention, a lithium ion battery taking the silicon-carbon composite material prepared by the method as a negative electrode material has high capacity, high first effect, excellent rate capability and cycle performance, the preparation method is simple, and industrial large-scale production can be realized.

Description

technical field [0001] The invention relates to a silicon-carbon composite material, an electrode, a lithium ion battery and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have energy density, lifespan and environmental protection characteristics far superior to other battery systems, and are currently the largest production and most widely used rechargeable batteries. With the miniaturization, multi-function and intelligent development of mobile devices, electronic devices have put forward higher requirements for the energy density and power density of lithium-ion secondary batteries. In the field of electrical tools and electric vehicles, the mass energy density and power density of batteries have more stringent requirements for high energy density and fast charging. At present, the anode material of commercialized lithium-ion batteries is mainly graphite. Due to the limitation of element type and structure, it is difficu...

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): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525
CPCY02E60/10
Inventor 潘福森童磊沈龙孙宝利聂顺军李虹
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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