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

Process for preparing carbon coated graphite microparticles

A technology of graphite micropowder and carbon coating, which is applied in the treatment of dyed polymer organic compounds and fibrous fillers. The effect of long discharge platform and low charge and discharge voltage

Inactive Publication Date: 2003-02-19
TSINGHUA UNIV
View PDF0 Cites 49 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the co-intercalation of small molecules such as electrolytes, the expansion and contraction of graphite will cause the graphite sheets to fall off, resulting in a larger irreversible capacity and a reduced cycle life.
Graphite cannot be used in PC (propylene carbonate) electrolyte, and PC is an ideal electrolyte for lithium-ion batteries, so the application of graphite in lithium-ion batteries is limited

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
  • Process for preparing carbon coated graphite microparticles
  • Process for preparing carbon coated graphite microparticles
  • Process for preparing carbon coated graphite microparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] The present invention is a preparation method of carbon-coated graphite micropowder used as a lithium-ion battery negative electrode material, figure 1 Shown is a schematic diagram of the preparation of carbon-coated graphite powder. Carbon-coated graphite powder is prepared by spray granulation. Firstly, the graphite powder, resin and ethanol used as the carbon coating layer are mixed at a volume ratio of 1:1:1 to form a suspension, and the prepared suspension is sprayed at a high speed. In this process, due to the effect of surface energy, the fluid resin liquid will flow and shrink, and the graphite powder will be coated to form coated graphite, and then the composite powder obtained by spray granulation , dried in hot air, and then carbonized at 700-1200°C to obtain carbon-coated graphite powder (such as figure 2 shown). The resin used for the cladding layer is phenolic resin, epoxy resin, or furfural resin. Above-mentioned graphite micropowder is natural microc...

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
Login to View More

Abstract

A process for preparing carbon coated graphite microparticles used as negative electrode material of Li-ion battery features use of spray granulating method. It can elongate the service life of Li-ion battery.

Description

technical field [0001] The invention belongs to the technical scope of preparation of battery electrode materials, in particular to the preparation of a carbon-coated graphite micropowder which has good cycle stability and can be used in a dielectric solution containing propylene carbonate (PC) as a lithium-ion battery negative electrode material. method. Background technique [0002] Because graphite material has the advantages of low charge and discharge voltage for lithium batteries, long charge and discharge platform, and good cycle life, it has been commercialized as an anode material for lithium ion batteries. However, due to the co-intercalation of small molecular substances such as electrolytes, graphite expansion and contraction lead to graphite flakes falling off, resulting in a large irreversible capacity and a reduced cycle life. Graphite cannot be used in PC (propylene carbonate) electrolyte, and PC is an ideal electrolyte for lithium-ion batteries as an electr...

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): C09C1/46C09C3/10
Inventor 沈万慈何明刘旋康飞宇郑永平
Owner TSINGHUA UNIV
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