Low-cost long-cycle graphite negative electrode material, preparation method and application thereof

A graphite negative electrode and graphite micropowder technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of difficult to meet the requirements of high-end power battery materials, low compaction density, large specific surface area, etc., and achieve high Coulombic efficiency for the first time , high carbonization residual carbon, and the effect of reducing the specific surface area

Active Publication Date: 2021-10-22
ZHANJIANG JUXIN NEW ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surface of these two materials is porous, and after being pulverized into fine powder particles, there are defects such as excessive specific surface area and low compaction density, which are difficult to meet the material requirements of high-end power batteries.

Method used

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  • Low-cost long-cycle graphite negative electrode material, preparation method and application thereof

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[0034] 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.

[0035] 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

[0037] (1) After crushing the tailings of high-purity graphite products in the impact mill, they are shaped and classified to obtain the average particle size D 50 16μm graphite powder. Pitch (softening point 70°C) and graphite fine powder were added to the mixer at a mass ratio of 16:100, the speed was adjusted to 240r / min, and mixed for 1.5 hours to obtain the precursor powder.

[0038] (2) Fill the precursor powder into the rubber mold of the molding machine, and use high-frequency electromagnetic vibration to make the precursor compact. After compaction, vacuumize, discharge the air between the precursor particles, and put it into a container filled with water. In a high-pressure container, pressurize to 120MPa, heat to 140°C, keep the pressure for 3 hours, cool to room temperature and press into a block.

[0039] (3) Carbonize the block in step (2) in a nitrogen atmosphere, raise the temperature to 1200°C at a rate of 25°C / min and keep it warm for 2 hours. During the pro...

Embodiment 2

[0041] (1) After crushing the tailings of the resistance material products in the impact mill, they are shaped and classified to obtain the average particle size D 50 17μm graphite powder. Pitch (softening point 80°C) and graphite fine powder were added to the mixer at a mass ratio of 12:100, the speed was adjusted to 200r / min, and mixed for 2.5 hours to obtain the precursor powder.

[0042] (2) Fill the precursor powder into the rubber mold of the extrusion molding machine, and use high-frequency electromagnetic vibration to make the precursor compact. After compaction, vacuumize to discharge the air between the precursor particles. In a high-pressure container, pressurize to 90MPa, heat to 170°C, keep the pressure for 2 hours, cool to room temperature and press into a block.

[0043](3) Carbonize the block in step (2) in a nitrogen atmosphere, raise the temperature to 1100°C at a rate of 20°C / min and keep it warm for 3 hours. During the process, nitrogen gas is continuously...

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Abstract

The invention provides a low-cost long-cycle graphite negative electrode material, a preparation method and application thereof. In the preparation method, the temperature of a forming press is controlled to be 40-100 DEG C higher than the melting point of asphalt, so that the asphalt is kept in a liquid state, the asphalt can be completely ensured to be filled into pores in graphite micro powder at high temperature and high pressure while an asphalt coating layer is formed on the surface of the graphite micro powder; in a high-pressure carbonization process, volatilization of low-molecular-weight aromatic compounds and straight-chain small-molecular aliphatic hydrocarbons in asphalt can be inhibited; and a pressurization process is also beneficial to the proceeding of polymerization reaction, so that the carbonization residual carbon of the asphalt is high, the internal pores of the graphite micro powder can be quickly densified, the compaction density of the negative electrode material is improved, a uniform and compact carbon coating layer can be formed on the surface of the graphite micro powder, the specific surface area of the negative electrode material is reduced, and the first efficiency and the cycle performance of the battery are improved.

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 low-cost long-cycle graphite negative electrode material and a preparation method and application thereof. Background technique [0002] Energy storage technology is an effective means to balance the needs of various energy applications and improve the overall energy efficiency of society. It has broad application prospects in improving the access capacity of large-scale and distributed renewable energy and improving the quality of urban micro-grid power. . Among the existing energy storage battery systems, lithium-ion batteries have become the most concerned energy storage battery system due to their flexible material system and rapid technological update, and have been widely used in various demonstration projects. [0003] At present, energy storage lithium-ion batteries on the market basically use artificial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/52C04B35/622H01M4/587H01M10/0525
CPCC04B35/522C04B35/622H01M4/587H01M10/0525H01M2004/027C04B2235/6567C04B2235/77Y02E60/10
Inventor 叶雨佐刘明东林毛吴其修
Owner ZHANJIANG JUXIN NEW ENERGY
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