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Composite graphite cathode material and preparation method thereof

A technology of composite graphite and negative electrode materials, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of poor graphite rate performance, high current charging and discharging performance, poor compaction performance, etc., to improve compatibility, improve High current charge and discharge performance, good effect of high current charge and discharge performance

Active Publication Date: 2015-05-13
DONGGUAN KAIJIN NEW ENERGY TECH
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  • 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

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  • Composite graphite cathode material and preparation method thereof
  • Composite graphite cathode material and preparation method thereof
  • Composite graphite cathode 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...

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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

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01M4/36H01M4/583H01M4/587
CPCY02E60/10
Inventor 晏荦
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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