A kind of spherical graphite anode material with controllable morphology and preparation method thereof

A technology of spherical graphite and negative electrode materials, which is applied in the direction of negative electrodes, battery electrodes, and active material electrodes, can solve the problems of large differences in the shape of negative electrode materials, complex manufacturing processes of carbon microspheres, and difficulty in producing sample prices. High isotropy, improved processability, and enhanced electronic conductivity

Active Publication Date: 2022-08-09
KEDA (ANHUI) NEW MATERIAL CO LTD
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  • 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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  • A kind of spherical graphite anode material with controllable morphology and preparation method thereof
  • A kind of spherical graphite anode material with controllable morphology and preparation method thereof
  • A kind of spherical graphite anode 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 a 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, stir for 3 hours, and adjust the viscosity of the slurry to 700 mPa*s and the solid content of 40 during this process. % to obtain a suitable mixed slurry.

[0033] 3) Spheroidization: the slurry is dried into powder by spray drying equipment to obtain spherical granulated products. The inlet air temperature of 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 granulated product is coated with a dense single-layer metal thin layer of iron-copper alloy by vacuum sputtering coating method; the sputtering power of vacuum sputtering coating is 2000W, the ultra...

Embodiment 2

[0039] 1) Graphitization treatment: the graphite precursor is subjected to graphitization treatment, and the graphitization temperature is 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, stir for 3 hours, and adjust the viscosity of the slurry to 800mPa*s and the solid content of 38. % to obtain a suitable mixed slurry;

[0041] 3) Spheroidization: the slurry is dried into powder by spray drying equipment to obtain spherical granulated products. The inlet air temperature of 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 granulated product is coated with a dense single-layer metal thin layer of iron-copper alloy by vacuum sputtering coating method; the sputtering power of vacuum sputtering coating is 1800W, the ultrasonic vibration power...

Embodiment 3

[0047] 1) Graphitization treatment: the graphite precursor is subjected to graphitization treatment, and the graphitization temperature is 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, stir for 3 hours, and adjust the viscosity of the slurry to 850mPa*s and the solid content of 36 during the process. % to obtain a suitable mixed slurry;

[0049] 3) Spheroidization: the slurry is dried into powder by spray drying equipment to obtain spherical granulated products. The inlet air temperature of 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 granulated product is coated with a dense single-layer metal thin layer of iron-copper alloy by vacuum sputtering coating method; the sputtering power of vacuum sputtering coating is 1600W, the ultrasonic...

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Abstract

The present invention announced a controllable spherical graphite negative material. The spherical graphite negative material is bonded from a graphite piece of 5‑11 μm.And the surface of the spherical graphite particles is evenly attached to the conductive agent, the particle size of the prepared particles is 10‑30 μm.The present invention also announced the preparation method of materials. Through the spray drying method, it prepares the negative material of the spherical graphite lithium ion battery with a high -performance and appearance, and the outer layer of the spherical graphite is covered with a uniform single -layer mesh metal metalThe existence of copper and copper layer can maintain the spherical structure of the particles. The pores of the sieve -sieve can be allowed to pass through, and copper can promote the electronic conductivity of the lithium ion battery and improve the multiplier performance of the material.The addition of spherical graphite particles and internal conductors can improve the conductivity, shorten the transmission path of lithium ions, and improve the magnification performance of the material.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and particularly relates to a spherical graphite negative electrode material with controllable morphology 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, and it is the best choice as a negative electrode material. However, the manufacturing process of carbon microspheres is complicated and difficult to produce high-quality samples and is expensive. Based on this situation, a spherical graphite anode material with controllable morphology has been developed, and it has both the high conductivity of carbon microspheres. It is a very important work to improve the us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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