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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
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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 high-capacity graphite composite material for lithium-ion batteries aimed at improving the graphite capacity, reducing costs, and solving the problems of graphite high-current charging and discharging performance and poor compaction performance.

Method used

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  • 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
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Effect test

Embodiment 1

[0024] High-power electrode materials with a graphitization degree of about 94% are selected, and the highly graphitized particles are obtained by mechanically pulverizing them into 16um particles.

[0025] Throw 222.5kg of natural graphite particles (D5011um), 25kg of coal tar pitch (D5010um) 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 as follows: normal temperature to 200°C for 1 hour, 200°C to 400°C for 3 hours, 400°C to 600°C for 3 hours, 600°C for 2 hours. Let cool to room temperature. The secondary composite particles (D5016.0um) with core-shell structure were obtained.

[0026] Throw 10kg of the above highly graphitized particles, 89kg of secondary composite particles with a core-shell structure, and 1kg of coal tar pitch (D508um) into the reactor, feed while stirring, and heat after feeding. Adjust the rotati...

Embodiment 2

[0029] A crucible material with a degree of graphitization of about 93% is selected and crushed into 17um particles by mechanical means to obtain highly graphitized particles.

[0030] Throw 225kg of natural graphite particles (D5010um), 26kg of coal tar pitch (D5010um) 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 as follows: room 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 for 3 hours. Cool to normal temperature to obtain secondary composite particles with core-shell structure.

[0031] Throw 30kg of the above highly graphitized particles, 69kg of secondary composite particles with a core-shell structure, and 1kg of coal tar pitch (D508um) into the reactor, feed while stirring, and heat after feeding. Adjust the rotation speed to 25Hz, and the heating program...

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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

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Application Information

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