Long-cycle natural graphite-based modified composite material as well as preparation method and application thereof

A composite material and natural graphite technology, which is applied in the field of long-cycle natural graphite-based modified composite materials and their preparation, can solve problems such as complicated procedures, and achieve the effects of cost reduction and excellent high-temperature cycle performance.

Active Publication Date: 2020-06-05
GUANGDONG DONGDAO NEW ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these two methods have greatly improved the cycle performance of natural graphite, the production process needs to be carried out under high pressure, and the process is complicated

Method used

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  • Long-cycle natural graphite-based modified composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Weigh 12kg of petroleum pitch, whose physical and chemical indicators are 60% residual carbon value and 180°C softening point, heat the pitch to 220°C, weigh 100kg of natural flake graphite (150 μm) with a carbon mass content of 92.5%, and add it to the molten petroleum pitch , after stirring for 30 minutes, cooled to room temperature, then the cooled product was pulverized in a jet mill to D 50 was 27 μm, and material A was obtained.

[0046] Pass hot air at 160°C into the cavity of the shaping machine, put material A into the shaping machine for shaping, and obtain D 50 25 μm spherical graphite, then graphitized at 2800°C for 3 hours, cooled to room temperature, dispersed and sieved to obtain material B.

[0047] The isotropic pitch with a softening point of 240°C (coking value 60%) was crushed to 3 μm in an impact mill, and mixed with the above-mentioned material B at a mass ratio of 1.5:100. 2 Treat at 1200°C under protection for 4 hours, cool to room temperature,...

Embodiment 2

[0049] Take by weighing coal tar pitch 10kg, its physical and chemical index is residual carbon value 50%, 150 ℃ of softening points, pitch is heated to 180 ℃, weighs 100 kg of natural flake graphite (180 μ m) of carbon mass content 85.0% and joins in the coal pitch of melting, After stirring for 40 minutes, cool to room temperature, and then pulverize the cooled product in a jet mill until D 50 was 17 μm, and material A was obtained.

[0050] Pass hot air at 130°C into the cavity of the shaping machine, put material A into the shaping machine for shaping, and obtain D 50 Spherical graphite of 16 μm, then graphitized at 3000°C for 6 hours, cooled to room temperature, dispersed and sieved to obtain material B.

[0051] Isotropic asphalt (coking value 64%) with a softening point of 220°C was crushed to 3 μm in an impact mill, and mixed with the above-mentioned material B at a mass ratio of 1.0:100. 2 Treat at 1100°C under protection for 6 hours, cool to room temperature, dispe...

Embodiment 3

[0053] Take by weighing petroleum pitch 15kg, its physical and chemical index is residual carbon value 70%, 200 ℃ of softening points, pitch is heated to 220 ℃, weighs 90.0% natural flake graphite (180 μ m) of carbon mass content 100kg and joins in the petroleum pitch of melting, After stirring for 60 minutes, cool to room temperature, and then pulverize the cooled product in a jet mill until D 50 was 13 μm, and material A was obtained.

[0054] Pass hot air at 180°C into the cavity of the shaping machine, put material A into the shaping machine for shaping, and obtain D 50 12 μm spherical graphite, then graphitized at 3000°C for 3 hours, cooled to room temperature, dispersed and sieved to obtain material B.

[0055] Isotropic asphalt (coking value 72%) with a softening point of 200°C was crushed to 3 μm in an impact mill, mixed with the above-mentioned material B at a mass ratio of 0.8:100, and the 2 Treat at 1200°C under protection for 4 hours, cool to room temperature, di...

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Abstract

The invention discloses a long-cycle natural graphite-based modified composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing natural flake graphite with molten asphalt to coat the surface of the natural flake graphite with the asphalt, and then cooling; sequentially crushing and shaping the natural flake graphite coated with the asphalt on the surface to obtain spherical graphite; carrying out graphitization treatment on the spherical graphite, cooling, and carrying out scattering and screening treatment on the graphitized material; uniformly mixing the graphitized material with asphalt to coat the surface of the graphitized material with the asphalt to obtain a mixture; carbonizing the mixture, cooling, scattering, and screening to obtain the natural graphite-based modified composite material. When the composite material prepared by the method disclosed by the invention is used as a negative electrode material, relatively long cycle performance and relatively good electrochemical performance can be achieved, and the problem of high expansion of a natural graphite electrode is solved.

Description

technical field [0001] The invention belongs to the technical field of carbon negative electrode materials for lithium ion batteries, and in particular relates to a long-cycle natural graphite-based modified 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 graphite materials,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205C01B32/05H01M4/587H01M4/62H01M10/0525
CPCC01B32/05C01B32/205H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 叶雨佐吴其修
Owner GUANGDONG DONGDAO NEW ENERGY
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