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

Preparation method of graphite cathode material

A graphite negative electrode and graphitization technology, which is applied to battery electrodes, electrical components, circuits, etc., can solve the problems of slow initial charge and discharge speed, low initial charge and discharge efficiency, and low capacity

Active Publication Date: 2012-03-21
湖北联投恒达石墨有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Asphalt coating has a large capacity, but the initial charge and discharge speed is slow, and the initial charge and discharge efficiency is low
Resin-coated charging and discharging are fast, and the first charge and discharge efficiency is high, but the capacity is low

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] A preparation method of graphite anode material includes the following steps:

[0023] 1) The surface of spherical graphite is oxidized, then mixed with fine pitch powder, and carbonized at a temperature of 1300±100℃;

[0024] 2) The carbonized spherical graphite is mixed with phenolic resin powder, and the mixed powder is cured in an acid mist environment;

[0025] 3) The cured material is carbonized at 900±50℃;

[0026] 4) Graphitize the material after carbonization in the previous step above 2500℃;

[0027] The graphite anode material is obtained through the above steps.

[0028] The spherical graphite is obtained by spheroidizing natural flake graphite in a spheroidizing machine, the spherical graphite D50 is between 7-50μm, and the tap density is 0.90g / cm 3 Above, the specific surface area is 7m 2 / G or less.

[0029] The surface oxidation described in step 1) is to immerse spherical graphite in hydrogen peroxide with a mass concentration of 30%, the weight ratio of spherical ...

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
densityaaaaaaaaaa
specific surface areaaaaaaaaaaa
softening pointaaaaaaaaaa
Login to View More

Abstract

The invention provides a preparation method of a graphite cathode material. In the method provided by the invention, a twice cladding method is utilized to cover the bitumencarb with resin carbon and then cover graphite particles with the bitumencarb, thereby forming a gradient structure with different carbon layers. The resin carbon layers have large intervals, and good combination with electrolyte. The resin carbon layers form stable electrolytic films, the lithium ions can enter the bitumencarb layer through the electrolyte membrane and then enter the graphite layer, and organic solvent molecules are blocked by the bitumencarb layer without being inserted into graphite pieces. In addition, the resin carbon has good mechanical strength, and the cycle life of the cathode material can be enhanced. The carbon is covered on the surface of the graphite particles to form the insertable structure for the lithium ions, thereby enhancing the inserting speed. Furthermore, the gaps of the resin carbon can store the lithium ions, thereby enhancing the capacity of the cathode material. The graphite cathode material obtained by the invention has the advantages that the capacity is above 360 mAh / g, the first cycle columbic efficiency is more than 95% and the cycle charging-discharging can be performed more than 3000 times, and rapid charging and discharging can be realized.

Description

Technical field [0001] The invention relates to a method for manufacturing a lithium ion battery negative electrode material, in particular to a method for preparing a graphite negative electrode material. Background technique [0002] There are many methods for processing carbon materials as anode materials for lithium-ion batteries. Natural flake graphite must be reshaped and modified to improve battery performance. The methods of processing anode materials for natural flake graphite are mainly spheroidization, surface oxidation and surface coating carbonization. Graphitization. The conventional modification method is to coat pitch on the surface of spherical graphite through liquid or solid phase process, and then carbonize it under nitrogen protection at a temperature of about 900-1300℃, or further graphitize, and the capacity can be 350mAh / g, the first efficiency is 92 %, negative electrode material that is cycled less than 1200 times. [0003] The asphalt coating capacity i...

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): C01B31/04H01M4/38
CPCY02E60/12Y02E60/10
Inventor 傅云峰
Owner 湖北联投恒达石墨有限公司
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