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Hard carbon material preparation method

A hard carbon and raw material technology, which is applied in the preparation/purification of carbon, chemical instruments and methods, carbon compounds, etc., can solve the problem of limiting the performance potential of hard carbon materials, low lithium ion intercalation expansion rate, first Coulombic efficiency and first discharge capacity Poor and other problems, to achieve the effect of providing high-power discharge performance, good stability of particle size and solid content, and superior high and low temperature performance

Pending Publication Date: 2021-04-16
浙江阿佩克斯能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, carbon-based materials are the main materials for lithium battery anode materials. Among them, hard carbon materials have the advantages of long cycle life, good power performance, and low lithium ion intercalation expansion rate. Compared with graphite, the structure of hard carbon materials presents various isotropic, and the content of oxygen-containing groups on the surface is much higher than that of graphite materials, resulting in poor first-time Coulombic efficiency and first-time discharge capacity of existing hard carbon materials, which limits the performance potential of hard carbon materials and leads to their far-reaching application in lithium battery materials. Lower than graphite anode materials, therefore, the existing hard carbon anode materials need to be further improved

Method used

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  • Hard carbon material preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Put 500g coconut shell in the heating bowl and place it in the atmosphere furnace, feed N2 at 0.1MPa, the flow rate is 200sscm, the temperature is raised to 550C after 30 minutes, and the heating rate is 10C / min. Coconut shell charcoal was formed after 2 hours of heat preservation.

[0024] (2) The prepared coconut shell charcoal is preliminarily pulverized by jet milling until D50 is 7um.

[0025] (3) Put the primary pulverized material into the material bowl, heat it to 1350°C under the protection of N2, the heating rate is 10C / min, and keep it warm for 12 hours to form a hard carbon precursor.

[0026] (4) In a 500mL reactor, add 20g of asphalt, raise the temperature to 165C, stir until the asphalt is completely melted, add 300g of hard carbon precursor, keep stirring at 165C for 2 hours, so that the hard carbon precursor and asphalt are fully mixed, Cool to room temperature;

[0027] (5) Grind the formed lumps with a pair of rollers, and crush them with an air...

Embodiment 2

[0029] Embodiment 2 is consistent with other step parameters of Embodiment 1, and the difference is that the hard carbon material is made without asphalt wrapping. The steps of Embodiment 2 are as follows:

[0030] (1) Put 500g coconut shell in the heating bowl and place it in the atmosphere furnace, feed N2 at 0.1MPa, the flow rate is 200sscm, the temperature is raised to 550C after 30 minutes, and the heating rate is 10C / min. Coconut shell charcoal was formed after 2 hours of heat preservation.

[0031] (2) The prepared coconut shell charcoal is pulverized to a D50 of 7um using airflow.

[0032] (3) Put the pulverized material in the material bowl, heat it to 1150C under the protection of N2, the heating rate is 10C / min, and keep it warm for 12 hours to form a hard carbon material.

Embodiment 3

[0034] Embodiment 3 is consistent with other step parameters of Embodiment 1, the difference being that the heating temperature in step (3) is 1150°C.

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Abstract

The invention discloses a preparation method of a hard carbon material, which comprises the following steps: pre-carbonizing a carbon-containing raw material containing natural components to obtain a precursor; carrying out preliminary crushing on the precursor to prepare a crushed material; in an inert atmosphere, carrying out high-temperature sintering on the crushed material and carbonizing to prepare a hard carbon precursor; stirring, heating and mixing the hard carbon precursor and asphalt, and carrying out coating treatment to obtain a coating product; carbonizing the coated hard carbon precursor and asphalt in vacuum, and crushing and grading the product to obtain a hard carbon material. According to the invention, natural biomass components are used as raw materials and are coated on the surface, so that the production cost is reduced, the first coulombic efficiency and the first discharge capacity are improved, and the performance of the hard carbon material is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a hard carbon material. Background technique [0002] At present, carbon-based materials are the main materials for lithium battery anode materials. Among them, hard carbon materials have the advantages of long cycle life, good power performance, and low lithium ion intercalation expansion rate. Compared with graphite, the structure of hard carbon materials presents various isotropic, and the content of oxygen-containing groups on the surface is much higher than that of graphite materials, resulting in poor first-time Coulombic efficiency and first-time discharge capacity of existing hard carbon materials, which limits the performance potential of hard carbon materials and leads to their far-reaching application in lithium battery materials. It is lower than graphite anode materials, therefore, the existing hard carbon anode materials need to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C01B32/205H01M4/587H01M10/0525
CPCY02E60/10
Inventor 陈再华傅强戴海生叶广观蓝利波
Owner 浙江阿佩克斯能源科技有限公司
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