High-capacity graphite composite material of lithium-ion battery and preparation method of composite material

A lithium-ion battery and composite material technology, which is applied in the field of high-capacity graphite composite materials for lithium-ion batteries and its preparation, can solve the problems of high-current charging and discharging performance and poor compaction performance of graphite, and achieve high-current charging and discharging performance. , Facilitate wetting and improve compatibility

Active Publication Date: 2015-05-06
DONGGUAN KAIJIN NEW ENERGY TECH
View PDF5 Cites 16 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 high-capacity graphite composite material for lithium-ion batteries aimed at improving the g

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
  • High-capacity graphite composite material of lithium-ion battery and preparation method of composite material
  • High-capacity graphite composite material of lithium-ion battery and preparation method of composite material
  • High-capacity graphite composite material of lithium-ion battery and preparation method of composite material

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1:

[0024] A high-power electrode material with a graphitization degree of about 94% is selected and mechanically crushed into 16um particles to obtain highly graphitized particles.

[0025] Put natural graphite particles (D5011um) 222.5kg, coal tar pitch (D5010um) 25kg and graphitization catalyst SiC 2.5kg into the drum furnace. When feeding, the drum is rotating while feeding, and heating and kneading are performed after feeding. Adjust the rotating speed of the drum to 30Hz, and the heating program is: normal temperature to 200°C for 1 hour, 200°C to 400°C for 3 hours, 400°C to 600°C for 3 hours, and 600°C constant temperature for 2 hours. Cool to room temperature. The secondary composite particles (D5016.0um) with core-shell structure were prepared.

[0026] Put 10kg of the above highly graphitized particles, 89kg of core-shell structured secondary composite particles, and 1kg of coal pitch (D508um) into the reactor. When feeding, add while stirring, and heat af...

Example Embodiment

[0028] Example 2:

[0029] The crucible material with a graphitization degree of about 93% is selected, and the highly graphitized particles are made by mechanical crushing into 17um particles.

[0030] Put 225kg of natural graphite particles (D5010um), 26kg of coal pitch (D5010um), and 2.8kg of graphitization catalyst SiC into the drum furnace. When feeding, the drum rotates while feeding, and heating and kneading are performed after feeding. Adjust the rotating speed of the drum to 30Hz, and the heating program is: normal temperature to 200°C for 1.5 hours, 200°C to 400°C for 3 hours, 400°C to 600°C for 3.5 hours, and 600°C constant temperature for 3 hours. Cool to normal temperature to prepare secondary composite particles with core-shell structure.

[0031] Put 30kg of the above highly graphitized particles, 69kg of secondary composite particles with core-shell structure, and 1kg of coal pitch (D508um) into the reactor. When feeding, add while stirring, and heat after feeding. ...

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
Particle sizeaaaaaaaaaa
Discharge capacityaaaaaaaaaa
Login to view more

Abstract

The invention discloses a high-capacity graphite composite material of a lithium-ion battery and a preparation method of the composite material. The high-capacity graphite composite material comprises two materials a and b, wherein a is highly graphitized particles, while b is secondary composite particles with core-shell structures; the secondary composite particles with the core-shell structures are prepared from natural graphite by virtue of impurity removal, spheroidization, coating and gluing; the weight ratio of a to b is 90:10 to 5:95. The high-capacity graphite composite material is produced by virtue of a high-temperature integrated coating, gluing and carbonizing process, and cooling; as a result, the graphite capacity is improved, the cost is reduced, and the problems of poor high-current charging/discharging performance and poor compaction performance of the graphite are solved.

Description

technical field [0001] The invention relates to the field of preparation of negative electrode materials for lithium batteries, in particular to a high-capacity graphite composite material for lithium ion batteries 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, it is hoped that the battery can be used for a long time after a single charge and has a long service life, so batteries with higher capacity and longer cycle life are required to provide energy for such devices and devices. [0003] Lithium-ion battery anode materials, as an important part of lithium-ion batteries, have a great impact on the battery capacity and cycle life of the battery, and there is an urgent need to improve t...

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
IPC IPC(8): H01M4/62H01M4/1393H01M4/133
CPCH01M4/133H01M4/1393H01M4/362H01M4/583Y02E60/10
Inventor 晏荦
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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