Preparation method of high-capacity and high-stability lithium ion battery negative electrode material

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of reduced charge and discharge efficiency, reduced battery reversible capacity, material volume expansion, etc., and achieve excellent discharge specific capacity , the effect of excellent cycle stability

Active Publication Date: 2021-07-20
青岛龙迪碳材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, graphite, as a lithium battery negative electrode material, has the advantages of low production cost and good development prospects. Artificial graphite is used as a lithium ion battery negative electrode material, and its surface is prone to irreversible reactions with the electrolyte, resulting in a decrease in charge and discharge efficiency, and problems caused by solvent co-intercalation. The reversible capacity of the battery is reduced, the volume of the material is expanded, and the cycle performance is poor, so new methods are sought to improve these problems

Method used

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  • Preparation method of high-capacity and high-stability lithium ion battery negative electrode material

Examples

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Effect test

Embodiment 1

[0012] A method for preparing a high-capacity, high-stability lithium-ion battery negative electrode material, specifically comprising the following steps:

[0013] S1: Petroleum coke was first heat-treated at 300°C for 3 hours, and then pulverized. The particle size of the pulverized powder was kept at 5 μm, and the obtained product was used in the next step.

[0014] S2: Then mix the product in step S1 with sodium peroxide or potassium peroxide, stir at room temperature for 0.5 h, then add distilled water so that the solid mixture can be prepared into a slurry, react for 2 h, then dry the solid, and Put it into a tube furnace, conduct a second heat treatment at 700°C for 10 hours under air conditions, and set aside for later use, wherein the mass ratio of the product in step S1 to sodium peroxide or potassium peroxide is 1:0.06.

[0015] S3: The product obtained in step S2 is subjected to graphitization treatment, graphitized and calcined at 2500° C. under atmospheric condit...

Embodiment 2

[0017] A method for preparing a high-capacity, high-stability lithium-ion battery negative electrode material, specifically comprising the following steps:

[0018] S1: Petroleum coke was first heat-treated at 350°C for 6 hours, and then pulverized. The particle size of the pulverized powder was kept at 10 μm, and the obtained product was used in the next step.

[0019] S2: Then mix the product in step S1 with sodium peroxide or potassium peroxide, stir at room temperature for 2 hours, then add distilled water so that the solid mixture can be prepared into a slurry, react for 4 hours, then dry the solid, and add In a tube furnace, under air conditions, conduct a second heat treatment at 800° C. for 15 hours, and set aside, wherein the mass ratio of the product in step S1 to sodium peroxide or potassium peroxide is 2:0.09.

[0020] S3: The product obtained in step S2 is subjected to graphitization treatment, graphitized and calcined at 3000° C. under atmospheric conditions for ...

Embodiment 3

[0022] A method for preparing a high-capacity, high-stability lithium-ion battery negative electrode material, specifically comprising the following steps:

[0023] S1: Petroleum coke was first heat-treated at 320°C for 4 hours, and then pulverized. The particle size of the pulverized powder was kept at 6 μm, and the obtained product was used in the next step.

[0024] S2: Then mix the product in step S1 with sodium peroxide or potassium peroxide, stir at room temperature for 1 hour, then add distilled water so that the solid mixture can be prepared into a slurry, react for 3 hours, then dry the solid, and add In a tube furnace, under air conditions, conduct a second heat treatment at 750° C. for 12 hours, and set aside, wherein the mass ratio of the product in step S1 to sodium peroxide or potassium peroxide is 1.3:0.07.

[0025] S3: The product obtained in step S2 is subjected to graphitization treatment, graphitized and calcined at 2700° C. for 17 hours, then cooled, ground...

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Abstract

The invention discloses a preparation method of a high-capacity and high-stability lithium ion battery negative electrode material, which comprises the following steps: carrying out heat treatment on petroleum coke at 300-350 DEG C for 3-6 hours, then carrying out grinding treatment, and keeping the particle size of the ground powder at 5-10 microns to obtain a product for later use; s2, mixing the product in the step S1 with sodium peroxide or potassium peroxide, stirring for 0.5-2 hours at room temperature, adding distilled water, reacting for 2-4 hours, drying the solid, adding into a tubular furnace, and performing secondary heat treatment for 10-15 hours at the temperature of 700-800 DEG C under the air condition for later use; and graphitizing the product obtained in the step S2, graphitizing and calcining the product for 15-20 hours under the atmospheric condition of 2500-3000 DEG C, cooling, grinding, controlling the particle size of the product to be 3-6 microns, mixing the product meeting the particle size requirement with sodium peroxide or potassium peroxide according to the mass ratio of 1: (0.02-0.03), dropwise adding distilled water until the product is viscous, stirring, standing for 0.5-2 hours, and drying to obtain the negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery negative electrode materials, and in particular relates to a preparation method of a high-capacity, high-stability lithium-ion battery negative electrode material. Background technique [0002] Lithium-ion batteries have become the preferred secondary battery series for the development of the battery industry due to their high specific energy, high specific capacity, long-term cycle stability, and environmental protection. Among them, graphite, as a negative electrode material for lithium batteries, has the advantages of low production cost and good development prospects. Artificial graphite is used as a negative electrode material for lithium ion batteries, but its surface is prone to irreversible reactions with electrolytes, resulting in reduced charge and discharge efficiency, and problems caused by solvent co-intercalation. There are problems such as reduced battery reversible capa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205C01B32/21C01B15/043H01M4/587H01M4/62H01M10/0525
CPCC01B32/205C01B32/21C01B15/0435H01M4/587H01M4/62H01M10/0525Y02E60/10
Inventor 金俊
Owner 青岛龙迪碳材料科技有限公司
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