A low-cost low-expansion long-cycle natural graphite-based composite material and its preparation method and application

A technology of composite materials and natural graphite, which is applied in the field of low-cost, low-expansion, long-cycle natural graphite-based composite materials and its preparation, can solve the problem of low bulk density, reduce the charging amount of graphitization furnace, and increase the cost of graphitization of negative electrode materials and other problems, to achieve the effect of increasing the furnace charge, excellent high-temperature cycle performance, and improving cycle performance

Active Publication Date: 2021-09-07
GUANGDONG DONGDAO NEW ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the bulk density of the micropowder in the crucible is low, which will reduce the charging amount of the graphitization furnace, thereby increasing the graphitization cost of the negative electrode material

Method used

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  • A low-cost low-expansion long-cycle natural graphite-based composite material and its preparation method and application
  • A low-cost low-expansion long-cycle natural graphite-based composite material and its preparation method and application

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preparation example Construction

[0050] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0051] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0053] Natural flake graphite (D 50 200μm) 100kg into the kneading pot, kneaded at 200°C for 30 minutes, cooled to room temperature, and then pulverized the cooled product in a jet mill to D 50 It is 27μm, and finally it is shaped in the shaping machine to get D 50 25μm spherical graphite. Spherical graphite was treated with cold isostatic pressing equipment at 100 MPa for 20 minutes to obtain graphite block. Put the graphite block directly into the graphitization furnace, treat it at 2800°C for 4 hours and cool it down, break up and sieve the graphitized material to obtain the material. The high-softening-point asphalt with a softening point of 200°C was crushed to 3 μm in an impact mill, and mixed with the above-mentioned prepared materials at a mass ratio of 0.8:100. 2 Treat at 1200°C under protection for 4 hours, cool to room temperature, disperse, sieve, and demagnetize to obtain a natural graphite-based composite material.

Embodiment 2

[0055] Natural flake graphite (D 50 160μm) 100kg into the kneading pot, kneaded at 100°C for 20 minutes, cooled to room temperature, and then pulverized the cooled product in a jet mill to D 50 It is 19μm, and finally it is shaped in a shaping machine to obtain D 50 17μm spherical graphite. After the spherical graphite is processed by cold isostatic pressing equipment at 200 MPa for 10 minutes, graphite block is obtained. Put the graphite block directly into the graphitization furnace, treat it at 2800°C for 3 hours and cool it down, break up and sieve the graphitized material to obtain the material. Put the materials prepared above into a rotary furnace, and in an argon atmosphere with a flow rate of 100 L / min and an environment of 800 ° C, feed methane at a flow rate of 1 L / min for 2 hours, and then switch to feed argon, After cooling to room temperature, disperse, sieve, and demagnetize, the natural graphite-based composite material can be obtained.

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Abstract

The invention provides a low-cost low-expansion long-cycle natural graphite-based composite material and its preparation method and application. In the method of the invention, by adding a modifier and adopting cold isostatic pressing or warm isostatic pressing The modifier is pressed into the voids inside the spherical graphite to realize the densification of the voids inside the spherical graphite curled carbon layer, and at the same time, the spherical graphite particles are formed into blocks. During the graphitization process, the blocks can be directly put into the graphitization process. In the furnace, the furnace loading capacity is increased and the crucible is not used, which greatly reduces the cost of the product, and at the same time further improves the cycle performance of spherical graphite.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium-ion batteries, and in particular relates to a low-cost, low-expansion, and long-cycle natural graphite-based composite material and its preparation method and application. Background technique [0002] Lithium-ion batteries have become a new generation of secondary batteries since the 1990s after nickel-metal hydride batteries because of their advantages such as high operating voltage, high energy density, long cycle life, small self-discharge, and no memory effect. In the development process of lithium-ion battery technology, the quality of batteries has been continuously improved, and the production cost has been continuously reduced. Anode materials have played a large role in the contribution to the technological progress of lithium-ion batteries. At present, the negative electrode materials of commercialized lithium-ion batteries are still dominated by graphi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M10/0525
CPCH01M4/366H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 吴其修叶雨佐肖玮王宪
Owner GUANGDONG DONGDAO NEW ENERGY
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