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

A kind of composite graphite negative electrode material and preparation method thereof

A technology of composite graphite and negative electrode materials, which is applied in chemical instruments and methods, carbon compounds, battery electrodes, etc., can solve the problems of poor graphite rate performance, high current charge and discharge performance, and poor compaction performance, so as to improve compatibility performance, high-current charging and discharging performance, and high-capacity effects

Active Publication Date: 2018-03-02
DONGGUAN KAIJIN NEW ENERGY TECH
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a composite graphite negative electrode material. The composite graphite material obtained by compounding two types of secondary graphite particles with different characteristics aims to improve the graphite capacity and solve the problem of poor graphite rate performance and high current charge and discharge performance. , poor compaction performance

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
  • A kind of composite graphite negative electrode material and preparation method thereof
  • A kind of composite graphite negative electrode material and preparation method thereof
  • A kind of composite graphite negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Oil-based petroleum coke is crushed into 3um particles by jaw crusher and machine, and 230kg of the ground petroleum coke particles, 30kg of coal tar pitch (D50 10um) and 2.6kg of graphitization catalyst SiC are thrown into the reactor, and the materials are added while stirring , heating after feeding. Adjust the rotating speed of the drum to 30Hz, and the heating program is as follows: room temperature to 200°C for 1.5 hours, 200°C to 400°C for 2.5 hours, 400°C to 600°C for 2.5 hours, 600°C for 2.5 hours. Let cool to room temperature. Then it is catalyzed and graphitized at 2900°C under chlorine gas. Artificial graphite secondary particles (D50 9.0um) were prepared.

[0051] Throw 222.5kg of natural graphite particles (D50 5um), 25kg of coal tar pitch (D50 10um) and 2.5kg of graphitization catalyst SiC into the drum furnace, feed while the drum is rotating, and heat and knead after feeding. Adjust the rotating speed of the drum to 30Hz, and the heating program is a...

Embodiment 2

[0054] The coal-based petroleum coke is crushed into 4um particles by jaw crusher and machine, and 220kg of the ground petroleum coke particles, 20kg of coal tar pitch (D50 10um) and 2.4kg of graphitization catalyst SiC are thrown into the reactor, and the materials are added while stirring. , heating after feeding. Adjust the rotating speed of the drum to 30Hz, and the heating program is as follows: room temperature to 200°C for 1 hour, 200°C to 400°C for 2 hours, 400°C to 600°C for 2.5 hours, 600°C for 3.5 hours. Let cool to room temperature. Then it is catalyzed and graphitized at 2900°C under chlorine gas. Artificial graphite secondary particles (D50 10.0um) were prepared.

[0055] Throw 225kg of natural graphite particles (D50 4um), 26kg of coal tar pitch (D50 10um) and 2.8kg of graphitization catalyst SiC into the drum furnace, feed while the drum is rotating, and heat and knead after feeding. Adjust the rotating speed of the drum to 30Hz, and the heating program is a...

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
specific surface areaaaaaaaaaaa
current efficiencyaaaaaaaaaa
Login to View More

Abstract

The invention discloses a composite graphite cathode material and a preparation method thereof. The composite graphite cathode material comprises graphite particles a and b, wherein the graphite particles a are secondary artificial graphite particles formed by granulating, coating and bonding oil-based petroleum coke; the graphite particles b are secondary composite graphite particles, adopting core-shell structures, formed by removing impurities from small-particle diameter natural graphite balls, and spherodizing, coating and bonding the small-particle diameter natural graphite balls; the composite graphite material is prepared by mixing the graphite particles a and b, adding a binding agent, coating, bonding and performing high temperature carbonization. By compounding the two secondary graphite particles with different characteristics to prepare the composite graphite material, the capacity of graphite is improved and the problems that the graphite is poor in rate capability, poor in high-current charge and discharge performance, poor in compacting performance are solved.

Description

technical field [0001] The invention relates to the field of preparation of lithium battery negative electrode materials, in particular to a composite graphite negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high operating voltage, high energy density, long service life, no memory effect, and low self-discharge, and have become the preferred power source for advanced electronic equipment. With the diversification of people's life and the acceleration of the rhythm, it is hoped that the charging time of the battery will be shorter, and at the same time, it will be used for a long time after being fully charged. Therefore, a battery with higher charging performance, higher discharge capacity and longer service life is required. Such equipment and devices provide energy. [0003] Lithium-ion battery anode materials, as an important part of lithium-ion batteries, have a great impact on...

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): C01B32/205H01M4/36H01M4/583H01M4/587
CPCY02E60/10
Inventor 晏荦
Owner DONGGUAN KAIJIN NEW ENERGY 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