Method for preparing graphite anode material of membrane-structural lithium ion battery by hot coating method

A lithium-ion battery, graphite anode technology, applied in battery electrodes, structural parts, circuits, etc., can solve the problems of equipment maintenance, complex process, complex process, uneven thickness of the coating layer, etc.

Inactive Publication Date: 2013-04-03
HUNAN DETIAN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The solid-state hybrid coating method uses graphite and pitch to be mixed at room temperature, and then carbonized at a certain temperature. This preparation method is simple in process and low in production cost. It is the main preparation method in China, but the lithium-ion battery graphite negative electrode material prepared by this method The coating layer is not perfect and stable, and it is easy to have uneven thickness of the coating layer and easy falling off of the coating layer.
[0004] The liquid phase coating method adopts the method of dissolving asphalt in a certain solvent at room temperature, then adding graphite for a certain period of time, and then performing impurity removal, dehydration, drying, carbonization and other processes on the slurry after the stirring is completed. The coating layer of graphite anode materials for lithium-ion batteries is relatively complete and stable, but the process is relatively complicated and the production cost is relatively high
[0005] The melt spray coating method is to melt the pitch into a fluid at a certain temperature, and then spray the pitch onto the graphite that is constantly stirring and tumbling, and then stir for a certain period of time, and finally carbonize. The lithium ion battery graphite negative electrode material prepared by this method Compared with the lithium-ion battery graphite anode material prepared by the liquid phase coating method, the performance is equivalent, and the cost is slightly lower, but the equipment maintenance and process are still relatively complicated, and the cost is still relatively high

Method used

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  • Method for preparing graphite anode material of membrane-structural lithium ion battery by hot coating method
  • Method for preparing graphite anode material of membrane-structural lithium ion battery by hot coating method
  • Method for preparing graphite anode material of membrane-structural lithium ion battery by hot coating method

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Weigh 100g of spherical natural graphite 1 with a particle size D50 of 18 μm and add it into the stirring tank 4 with a double-helix heating jacket, then weigh petroleum pitch micropowder 2 and anthracene oil 3 respectively as 15 g and 30 g and add it into the stirring tank 4, and turn on the stirring tank 4. Double-helix stirring, stirring for 2 hours, turning on the heating device of the stirring tank 4, raising the temperature to 250°C at a heating rate of 100°C per hour, continuing to stir for 2 hours, then putting the obtained material into a 95% corundum crucible, and then placing it in a In the atmosphere-protected heating furnace, adjust the heating speed of the heating furnace to raise the temperature from 50°C to 350°C per hour and keep the temperature for 3 hours, continue to raise the temperature to 800°C and keep it for 2 hours, then raise the temperature to 1200°C and keep it for 4 hours, and then cool to room temperature. The material is taken out and siev...

Embodiment 2

[0038]Weigh 100g of flaky natural graphite 1 with a particle size D50 of 20 μm and add it to the stirring tank 4 with a double-helix heating jacket, then weigh petroleum pitch micropowder 2 and coal tar 3 to 18g and 20g respectively, add them to the stirring tank 4, and turn on the stirring tank 4 The double-helix stirring, stirring for 2 hours, turned on the heating device of the stirring tank 4, and raised the temperature to 280°C at a heating rate of 150°C per hour, and continued to stir for 3 hours. In the heating furnace with atmosphere protection, adjust the heating speed of the heating furnace to raise the temperature from 50°C to 350°C per hour and keep the temperature for 2 hours, continue to raise the temperature to 800°C and keep it for 2 hours, then raise the temperature to 1200°C and keep it for 4 hours, then cool to room temperature , the material is taken out and sieved into fine powder and impurities are removed, and the thermal coating of the surface-coated car...

Embodiment 3

[0040] Weigh 100g of spherical natural graphite 1 with a particle size D50 of 18 μm and add it into the stirring tank 4 with a double-helix heating jacket, then weigh the coal tar pitch micropowder 2 and anthracene oil 3 as 15 g and 50 g and add it into the stirring tank 4, and turn on the stirring tank 4. Double-helix stirring, stirring for 2 hours, turning on the heating device of the stirring tank 4, raising the temperature to 250°C at a heating rate of 100°C per hour, continuing to stir for 2 hours, then putting the obtained material into a 95% corundum crucible, and then placing it in a In the atmosphere-protected heating furnace, adjust the heating speed of the heating furnace to raise the temperature from 50°C to 300°C per hour, keep the temperature for 2 hours, continue to heat up to 800°C and keep it for 2 hours, then raise the temperature to 1200°C and keep it for 4 hours, and continue to heat up to 2800°C Insulate for 18 hours, then cool to room temperature, take out...

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Abstract

The invention discloses a method for preparing a graphite anode material of a membrane-structural lithium ion battery by a hot method. The graphite anode material is prepared from graphite (1) serving as a base material, asphalt powder (2) serving as a coating material, a heavy hydrocarbon (3) serving as a liquid additive and a stirred tank (4) by seven steps such as A, B, C, D, E, F and J: taking asphalt as the coating material; mixing the materials in solid state; adding the additive to reduce the softening point of the asphalt; forming a complete and stable coating membrane by heating the asphalt into fluid and coating the fluid on the graphite serving as the base material; and molding, carbonizing and graphitizing the coating membrane by heat treatment to obtain the graphite anode material of the membrane-structural lithium ion battery. The method for preparing the graphite anode material of the membrane-structural lithium ion battery by the hot method has the advantages that: rawmaterials have low cost and are easy to obtain; a preparation process is simple and easy to operate and control; equipment is simple; the preparation cost is low; the method is suitable for large-scale adoption and popularization; and products have high a sphericization degree and high performance.

Description

Technical field: [0001] The invention relates to a new method for preparing a lithium-ion battery graphite negative electrode material, which belongs to the field of chemical engineering and new materials. Background technique: [0002] At present, the preparation of graphite-coated negative electrode materials for lithium-ion batteries mainly adopts solid-state mixing coating method, liquid phase coating method, melt spray coating method, spray granulation method, etc., but these preparation methods have their own advantages and disadvantages. [0003] The solid-state hybrid coating method uses graphite and pitch to be mixed at room temperature, and then carbonized at a certain temperature. This preparation method is simple in process and low in production cost. It is the main preparation method in China, but the lithium-ion battery graphite negative electrode material prepared by this method The coating layer is not perfect and stable enough, and it is prone to uneven thic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/1393
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 雷铁军梁育政
Owner HUNAN DETIAN NEW ENERGY TECH
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