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Plumbaginous modifying method and produced modified plumbago

A modification and graphite technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as difficult to achieve uniform coating, complicated production process, and high equipment requirements, so as to facilitate large-scale production and reduce equipment investment , the effect of long cycle life

Active Publication Date: 2008-06-11
内蒙古杉杉新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This coating method is easy to agglomerate, and the composite material must be pulverized to obtain a negative electrode material with a suitable particle size distribution, which will inevitably damage the shell layer, make it difficult to achieve uniform coating and shape retention, and also deteriorate the performance of the electrode. Difference
At the same time, impurities will be mixed during crushing and sieving, which makes the production process more complicated.
In addition, due to the use of organic solvents, it is easy to cause environmental pollution
[0006] Chinese invention patent (preparation method of carbon-coated graphite powder, CN1397598A) adopts the spray granulation method to obtain carbon-coated graphite powder with core-shell structure, but this method is difficult to ensure the stability between batches of coated graphite, and it is difficult for The requirements for equipment are relatively high, and it is difficult to industrialize production

Method used

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  • Plumbaginous modifying method and produced modified plumbago
  • Plumbaginous modifying method and produced modified plumbago
  • Plumbaginous modifying method and produced modified plumbago

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this embodiment, phenolic resin (Wuxi Alz Chemical Co., Ltd., powder particle size 2 μm) is used as the shell material (coating material), and the weight ratio of graphite to phenolic resin is 1:0.10.

[0033] The preparation process is as follows: Weigh 9 grams of phenolic resin (containing 1 gram of curing agent-hexamethylenetetramine, Wuxi Alz Chemical Co., Ltd.), mix it with 91 grams of natural graphite; pour the mixture into a reaction kettle and mix it thoroughly for 1 hour , in a nitrogen protective atmosphere, after rapidly raising the temperature to 100°C, gradually raising the temperature to 200°C at 1°C / min, keeping the temperature for 2 hours, then cooling down, discharging the material after cooling down to room temperature, and sieving. Put the sieved graphite into a high-temperature furnace, gradually raise the temperature to 1200°C under a nitrogen protective atmosphere, keep it warm for 2 hours, and naturally cool down to room temperature to obtain D ...

Embodiment 2

[0036] In this embodiment, epoxy resin (Suzhou Specialty Chemicals Co., Ltd., powder particle size of 3 μm) is used as the shell material, and the weight ratio of graphite to epoxy resin is 1:0.10.

[0037]The preparation process is as follows: Weigh 9 grams of epoxy resin (containing 1.2 grams of curing agent-m-phenylenediamine, Changshu Xinrun Dye Co., Ltd.), mix it with 91 grams of natural graphite; pour the mixture into the reaction kettle and mix it well for 1 hour. After rapidly raising the temperature to 110°C under a nitrogen protective atmosphere, gradually raise the temperature to 250°C at 0.5°C / min, keep the temperature for 5 hours, then lower the temperature, discharge the material after cooling down to room temperature, and sieve. Put the sieved graphite into a high-temperature furnace, gradually raise the temperature to 1200°C under a nitrogen protective atmosphere, keep it warm for 2 hours, and naturally cool down to room temperature to obtain D 50 15.5μm compos...

Embodiment 3

[0040] In this embodiment, polystyrene (Jiangsu Layden Group Co., Ltd., powder particle size of 3 μm) is used as the shell material, and the weight ratio of graphite to polystyrene is 1:0.10.

[0041] The preparation process is as follows: Weigh 9 grams of polystyrene and mix it with 91 grams of natural graphite; pour the mixture into a reaction kettle and mix it well for 1 hour, and then rapidly raise the temperature to 75°C under a nitrogen protective atmosphere, then gradually raise the temperature to 75°C at 2°C / min. 300°C, heat preservation for 10 hours, then lower the temperature, discharge the material after cooling down to room temperature, and sieve. Put the sieved graphite into a high-temperature furnace, gradually raise the temperature to 1000°C under a nitrogen protective atmosphere, keep it warm for 2 hours, and naturally cool down to room temperature to obtain D 50 15.3μm composite graphite material.

[0042] The composite graphite material was used as the carbo...

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Abstract

The invention discloses a modification process of graphite. The graphite and polymer are mainly and thoroughly mixed and quickly heated to the temperature of the softening point of the polymer and then gradually heated to the temperature which can enable the mixture to be completely cured with a heating rate of 0.5-2 DEG C per minute, then the temperature of the mixture is preserved and the mixture is cured, the mixture is thoroughly stirred in the heating process for granulation, graphite composite the surface of which is coated with the polymer is obtained, and the graphite composite is normally carbonized and treated after being cooled to the room temperature. As the invention employs solid phase method to coat, no pollution problem of organic solvent exists, and the method is an environment-friendly preparation process. The produced modified graphite can not cake and needs no crushing treatment, which simplifies the technique and reduces the equipment investment and is favorable for mass production, further, the modified graphite of the invention, in particular modified natural graphite which is taken as carbon negative electrode material has relatively long cycle life.

Description

technical field [0001] The invention relates to the field of carbon negative electrode materials, in particular to a method for modifying graphite and the prepared modified graphite. Background technique [0002] In recent years, lithium-ion batteries have been widely used in many industries due to their excellent performance in terms of high energy density, high voltage, no pollution, long cycle life, fast charge and discharge, and decreasing production costs. . The rapid development of lithium-ion batteries is mainly due to the contribution of electrode materials, especially the progress of carbon anode materials, and for a long time to come, the improvement of lithium-ion battery capacity and high-current discharge performance will still rely on carbon anode materials. Material development and refinement. [0003] Graphite materials, especially natural graphite, have a low discharge platform, high lithium insertion capacity, and high initial charge and discharge efficie...

Claims

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Application Information

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IPC IPC(8): C01B31/04H01M4/38
CPCY02E60/12Y02E60/10
Inventor 常鸿雁吴敏昌张殿浩
Owner 内蒙古杉杉新材料有限公司
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