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High thermal conductivity of graphite material and preparation method and application thereof

A technology of high thermal conductivity graphite and graphite materials, applied in the field of carbon materials, can solve environmental pollution and other problems, and achieve the effects of lower overall cost, lower production cost, and high density

Active Publication Date: 2014-08-13
ZHANJIANG JUXIN NEW ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method can solve the problem of environmental pollution caused by graphite tailings produced during the processing of lithium-ion battery carbon negative electrode materials

Method used

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  • High thermal conductivity of graphite material and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] First, the natural flake graphite tailings, mesocarbon microspheres and TiB 2 Weigh in a weight ratio of 32:63:5 and mix in a high-speed mixer for 2 hours. Then take a certain amount of mixed material and put it into a steel mold, form it on a flat vulcanizer with a pressure of 100 MPa, hold the pressure for 10 minutes and demould to obtain a green body. Put the green body in a graphitization furnace, under the protection of nitrogen, first raise the temperature to 900°C at a heating rate of 2°C / min, and keep it for 30 minutes; then raise it to 1300°C at a heating rate of 5°C / min, and hold 20 minutes; finally, the temperature was raised to 2000°C at a heating rate of 10°C / min, kept at a temperature of 60 minutes, and naturally cooled to 100°C to obtain the high thermal conductivity graphite material of the present invention. Its physical properties are shown in Table 1.

Embodiment 2

[0062] First, artificial graphite tailings, mesocarbon microspheres and TiC were weighed in a weight ratio of 50:46:4, and mixed in a high-speed mixer for 1 hour. Then take a certain amount of mixed material and put it into a steel mold, form it on a flat vulcanizer with a pressure of 200 MPa, hold the pressure for 5 minutes and demould to obtain a green body. Put the green body in a graphitization furnace, under the protection of nitrogen, first raise the temperature to 900°C at a rate of 2°C / min, and keep it for 20 minutes; then raise the temperature to 1300°C at a rate of 3°C / min, keep it 30 minutes; finally, the temperature was raised to 2200° C. at a heating rate of 15° C. / min, kept for 40 minutes, and naturally cooled to 100° C. to obtain the high thermal conductivity graphite material of the present invention. Its physical properties are shown in Table 1.

Embodiment 3

[0064] First, the natural flake graphite tailings, mesocarbon microspheres and B 4 C is weighed at a weight ratio of 64:33:3, and mixed in a high-speed mixer for 3 hours. Then take a certain amount of mixed material and put it into a steel mold, form it on a flat vulcanizer with a pressure of 240 MPa, hold the pressure for 1 minute and demould to obtain a green body. Put the green body in a graphitization furnace, under the protection of nitrogen, first raise the temperature to 900°C at a rate of 1°C / min, and keep it for 20 minutes; then raise the temperature to 1300°C at a rate of 5°C / min, and keep it 20 minutes; finally, the temperature was raised to 2000° C. at a heating rate of 20° C. / min, kept for 40 minutes, and naturally cooled to 100° C. to obtain the high thermal conductivity graphite material of the present invention. Its physical properties are shown in Table 1.

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Abstract

The invention relates to a high thermal conductivity graphite material, and a preparation method and application thereof. The high thermal conductivity graphite material uses graphite tailing and ceramic components generated in the machining processes of mesocarbon microbeads and lithium ion battery anode material as the main raw materials; and the raw materials are subjected to cold compression molding and graphitization to obtain the high thermal conductivity graphite material. The graphite material provided by the invention has excellent performance, is particularly suitable as a radiating fin base material for civil high-end electronic devices, LED chip materials and heat exchangers for industrial devices. In addition, the process provided by the invention is simple and has short material preparation period, and the size of the prepared material can be enlarged; therefore, the method is easy for mass production, and greatly reduces the cost of production materials. The method also solves the problems and hidden dangers of stacking landfill and environmental pollution caused by graphite tailing, realizes the comprehensive utilization of waste resources, and decreases the comprehensive cost for the manufacturers of composite cathode material of lithium ion battery by more than 10%.

Description

technical field [0001] The invention relates to the field of carbon materials, in particular to a high thermal conductivity graphite material and its preparation method and application. Background technique [0002] High-power density electronic devices and high-end electronic industrial devices are gradually developing toward miniaturization, compact structure, and high power density, which leads to heat dissipation problems and poses severe challenges to the stability and reliability of electronic components. Therefore, the problem of heat dissipation has become a bottleneck in the miniaturization and integration of electronic products. In order to dissipate the heat generated during the operation of electronic components as quickly as possible, it is becoming more and more important to develop materials with better thermal conductivity. At present, the heat sink substrates used in general heat dissipation materials (such as civil high-end electronic devices, chip materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B32/00
Inventor 吴其修刘明东
Owner ZHANJIANG JUXIN NEW ENERGY
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