Graphite spheroidization method and production system thereby

A graphite spheroidization and production system technology, applied in the direction of graphite, etc., can solve the problems of poor magnification performance, low product yield, high cost, etc., and achieve good spheroidization effect, compact processing equipment, and high product yield.

Inactive Publication Date: 2013-03-06
WUHU ZHEXIN NEW ENERGY
View PDF3 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the influence of forming conditions and processing technology, the two kinds of graphite have different material structures, resulting in large differences in material properties.
Compared with artificial graphite, natural graphite has large specific capacity, simple process, and relatively low price, but has poor stability, poor rate performance, and poor electrolyte adaptability
In order to improve the cycle stability and tap density of graphite, natural graphite is made into spherical or nearly spherical in industry, but due to the limitation of its preparation process, the product yield is low, energy consumption is large, and the cost is high, and the spherical shape is obtained. The sphericity of graphite is not high, and the performance of the product is not ideal
Artificial graphite (except for mesophase carbon microspheres) is prone to volume crushing during the spheroidization process due to its high hardness, and it is difficult to make it into a spherical shape with existing equipment and processes
[0003] At present, the domestic graphite spheroidization equipment is mainly eddy current mill, there is no professional shaping equipment, and the shaping mechanism is mostly impact shaping. If the impact force is too large, the graphite particles will be broken, resulting in a decrease in yield. Artificial graphite The equipment has poor shaping effect and can only be crushed
Although there are other equipment for shaping graphite in foreign countries, they are expensive, and the shaping effect on artificial graphite is still not good.

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 1

[0024] In this example, a batch-type graphite spheroidization system is used to spheroidize natural graphite, and four products with D50 of 5, 10, 15, and 20 μm are produced.

[0025] Put 50kg of natural graphite (-100 mesh) into the ultra-fine high-efficiency crushing system, adjust the crushing parameters of the system so that the D50 of the output is 23±2μm, the crushed graphite enters the first buffer bin, and passes through the automatic weighing in the first buffer bin. 10kg pulverized graphite is put into the micro-nano particle shaping and coating system, and after processing for 5 minutes at the host speed of 4500rpm, it enters the second buffer bin, and then enters through the spiral discharge system in the second buffer bin. Ultra-fine multi-stage grading system, after grading, 9kg of products with D50 of 5μm, 12kg of products with D50 of 10μm, 15kg of products with D50 of 15μm, and 14kg of products with D50 of 20μm are finally obtained.

Embodiment 2

[0027] In this example, a continuous graphite spheroidization system is used to spheroidize artificial graphite, and four products with D50 of 10, 15, 20, and 25 μm are produced.

[0028] Put 100kg of artificial graphite (-100 mesh) into the ultra-fine and efficient crushing system, adjust the crushing parameters of the system so that the D50 of the output is 25±2μm, and the crushed graphite enters the graphite spheroidization system composed of 9 micro-nano particle shaping and coating systems , the host speed of the micro-nanoparticle shaping and coating system in the system is 5500rpm, and after grading by the ultra-fine multi-level grading system, 15kg of products with a D50 of 10μm, 27kg of products with a D50 of 15μm, 36kg of products with a D50 of 20μm, and 25μm of a D50 The product is 22kg.

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

No PUM Login to view more

Abstract

The invention discloses a graphite spheroidization method and a production system thereby. The method comprises the following three steps of: (1) ultra-fine pulverizing, namely pulverizing graphite to a proper granularity by utilizing an ultra-fine high-energy pulverizer; (2) reshaping treatment, namely performing reshaping treatment on the pulverized graphite by utilizing a batch-type or continuous reshaping system consisting of one or more special reshaping devices and a micro-nano particle reshaping cladding system; and (3) ultra-fine multilevel classification, namely performing high-precision multilevel series classification on the graphite subjected to reshaping treatment by utilizing an ultra-fin multilevel classification system, so as to obtain narrow granular spherical graphite with the D50 of 3-35mu m. The method and the system haves the following advantages: the product spheroidization effect is good, the tap density is large, the yield of finished products is high, a favorable reshaping effect can be achieved for artificial graphite which is difficult to reshape, the preparation period is short, the processing equipment is compact, and the method is safe and environmentally-friendly.

Description

technical field [0001] The invention relates to a method for spheroidizing natural graphite and artificial graphite materials, in particular to a physical shaping method for spheroidizing artificial graphite and flake graphite materials for negative electrodes of lithium batteries and a related production system. Background technique [0002] Due to its good conductivity, excellent charge-discharge voltage platform, high specific capacity, and wide range of sources, graphite materials have always occupied a dominant position in lithium-ion battery anode materials, and have become a research hotspot in anode materials. Graphite materials for lithium batteries are mainly divided into natural graphite and artificial graphite. Natural graphite is mainly flake graphite, and artificial graphite includes needle coke, petroleum coke, carbon nanotubes and mesocarbon microspheres. Due to the influence of forming conditions and processing technology, the two kinds of graphite have dif...

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): C01B31/04C01B32/21
Inventor 高博姜银珠王伟赵夫涛李俊峰
Owner WUHU ZHEXIN NEW ENERGY
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