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Spherical graphite negative electrode material with controllable morphology and preparation method thereof

A technology of spherical graphite and negative electrode materials, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of expensive, poor uniformity, and complicated manufacturing process of carbon microspheres

Active Publication Date: 2021-09-14
KEDA (ANHUI) NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion batteries are widely used in the field of 3C consumer electronics, but the current mainstream process of graphite anode materials is coke crushing, shaping, granulation, graphitization, etc. As a kind of spherical particle, the ball has good rate performance, and as a spherical shape, its isotropy is very good, so it is the best choice as the negative electrode material
However, the manufacturing process of carbon microspheres is relatively complicated, it is difficult to produce high-quality samples, and the price is expensive. Based on this situation, a spherical graphite negative electrode material with controllable morphology has been developed, and it has the high conductivity of carbon microspheres. It is a very important job to improve the use value of materials with isotropy

Method used

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  • Spherical graphite negative electrode material with controllable morphology and preparation method thereof
  • Spherical graphite negative electrode material with controllable morphology and preparation method thereof
  • Spherical graphite negative electrode material with controllable morphology and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Graphitization treatment: the graphite precursor is subjected to graphitization treatment, and the graphitization temperature is 3100° C. to obtain graphite material.

[0032] 2) Mixing: Disperse the graphite material, dispersant, binder, and conductive agent in distilled water at a ratio of 97:1.5:0.5:1, and stir for 3 hours. During the process, adjust the viscosity of the slurry to 700mPa*s and the solid content to 40 %, to obtain a suitable mixed slurry.

[0033] 3) Spherification: The slurry is dried into powder by spray drying equipment to obtain a spherical granulated product. The inlet air temperature of the spray drying is 200°C, the outlet air temperature is 100°C, and the atomizer frequency is 400Hz.

[0034] 4) Stability treatment: The surface of the spherical granulation product is coated with a dense single-layer metal layer of iron-copper alloy by vacuum sputtering coating method; the sputtering power of vacuum sputtering coating is 2000W, and the ultr...

Embodiment 2

[0039] 1) Graphitization treatment: graphitize the graphite precursor at a graphitization temperature of 3200°C to obtain a graphite material;

[0040] 2) Mixing: Disperse the graphite material, dispersant, binder, and conductive agent in distilled water at a ratio of 97:1.5:0.5:1, and stir for 3 hours. During the process, adjust the viscosity of the slurry to 800mPa*s and the solid content to 38 %, obtain suitable mixed slurry;

[0041] 3) Spherification: The slurry is dried into powder by spray drying equipment to obtain a spherical granulated product. The air inlet temperature of the spray drying is 210°C, the outlet air temperature is 100°C, and the atomizer frequency is 420Hz;

[0042] 4) Stability treatment: The surface of the spherical granulation product is coated with a dense single-layer metal layer of iron-copper alloy by vacuum sputtering coating method; the sputtering power of vacuum sputtering coating is 1800W, the ultrasonic vibration power is 180W, and the sam...

Embodiment 3

[0047] 1) Graphitization treatment: graphitize the graphite precursor at a graphitization temperature of 3200°C to obtain a graphite material;

[0048] 2) Mixing: Disperse the graphite material, dispersant, binder, and conductive agent in distilled water at a ratio of 97:1.5:0.5:1, and stir for 3 hours. During the process, adjust the viscosity of the slurry to 850mPa*s and the solid content to 36 %, obtain suitable mixed slurry;

[0049] 3) Spherification: The slurry is dried into powder by spray drying equipment to obtain a spherical granulated product. The air inlet temperature for spray drying is 220°C, the outlet air temperature is 100°C, and the atomizer frequency is 430Hz;

[0050] 4) Stability treatment: The surface of the spherical granulation product is coated with a dense single-layer metal layer of iron-copper alloy by vacuum sputtering coating method; the sputtering power of vacuum sputtering coating is 1600W, the ultrasonic vibration power is 190W, and the sample h...

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Abstract

The invention discloses a spherical graphite negative electrode material with controllable morphology, the spherical graphite negative electrode material is formed by bonding 5-11 [mu] m graphite flakes, the outer layer of the structure is coated with uniform single-layer screen-shaped metal copper, a conductive agent is uniformly attached to the surfaces and the interiors of spherical graphite particles, and the particle size of the prepared particles is 10-30 [mu] m. The invention further discloses a preparation method of the material, the spherical graphite lithium ion battery negative electrode material with high performance and controllable morphology is prepared through a spray drying method, the outer layer of spherical graphite is coated with uniform single-layer screen-shaped metal copper, and the existence of the copper layer can maintain the spherical structure of particles the screen-shaped pores can allow lithium ions to pass through, and the copper can promote the electronic conductivity of the lithium ion battery and improve the rate capability of the material; and except for the copper coating layer, by adding the surfaces of spherical graphite particles and internal conductive agent, the conductivity can be improved, the transmission path of lithium ions is shortened, and the rate capability of the material is improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a shape-controllable spherical graphite negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in the field of 3C consumer electronics, but the current mainstream process of graphite anode materials is coke crushing, shaping, granulation, graphitization, etc. As a spherical particle, the ball has good rate performance, and as a spherical particle, its isotropy is very good, so it is the best choice as the negative electrode material. However, the manufacturing process of carbon microspheres is relatively complicated, it is difficult to produce high-quality samples, and the price is expensive. Based on this situation, a spherical graphite negative electrode material with controllable morphology has been developed, and it has the high conductivity of carbon microspheres. It is a very importa...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/587H01M10/0525
CPCH01M4/626H01M4/624H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 解乐乐付健刘双双叶建涛戴涛
Owner KEDA (ANHUI) NEW MATERIAL CO LTD
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