Graphite negative electrode material, preparation method thereof and secondary battery

A graphite negative electrode and graphitization technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of high OI value of materials and difficulty in overcoming the orientation characteristics of materials

Active Publication Date: 2021-09-21
HUNAN SHINZOOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most single-particle graphite aggregate materials are anisotropic, so in the conventional solid-phase secondary granulatio...

Method used

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  • Graphite negative electrode material, preparation method thereof and secondary battery
  • Graphite negative electrode material, preparation method thereof and secondary battery
  • Graphite negative electrode material, preparation method thereof and secondary battery

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preparation example Construction

[0021] A preparation method of a graphite negative electrode material comprises the first-stage fluidization, the second-stage fluidization and graphitization.

[0022] Specifically, aggregate particles and asphalt particles with a mass ratio of (80-98):(2-20) are fluidized in the first stage at 150-350°C in an inert atmosphere; at 400-800°C, inert The second stage of fluidization is carried out in the atmosphere; then graphitization is carried out in an inert atmosphere; wherein, the particle size of the asphalt particles D50 is 2-20 μm.

[0023] In this application, both the first-stage fluidization and the second-stage fluidization refer to making the material in a fluidized state. For example, in fluidization equipment, the material is in a fluidized state. In the embodiment of the present application, the mass ratio of aggregate particles to asphalt particles can be 80:10, 85:15, 86:14, 87:13, 90:10, 92:8, 93:7, 95:5 , 98:2 and so on.

[0024] Exemplarily, in some embo...

Embodiment 1

[0051] This embodiment provides a graphite negative electrode material, which is mainly prepared by the following method:

[0052] 1) Take 800g of green coke with a D50 particle size of 4μm and 200g of asphalt with a particle size of 20μm and mix them evenly.

[0053] 2) Put the material obtained in step 1) in a fluidized bed equipment, raise the temperature to 150° C. at a heating rate of 5° C. / min, fill the fluidized bed with nitrogen, and fluidize it for 6 hours at an air velocity of 5 L / min.

[0054] 3) The temperature was raised to 400° C. at a heating rate of 1° C. / min, and nitrogen was filled into the fluidized bed at an air velocity of 5 L / min, and fluidized for 5 hours.

[0055] 4) Put the material obtained in step 3) into a graphitization furnace for graphitization, the temperature of graphitization is 2800° C., and the time is 40 h.

[0056] 5) Coating the obtained graphitized particles with carbon, then sieving to obtain a material with Dmax≤30 μm, and then demagn...

Embodiment 2

[0059] This embodiment provides a graphite negative electrode material, which is mainly prepared by the following method:

[0060] 1) Take 850g of green coke with a D50 particle size of 8μm and 150g of asphalt with a particle size of 2μm and mix them evenly.

[0061] 2) Put the material obtained in step 1) in a fluidized bed equipment, raise the temperature to 350° C. at a heating rate of 10° C. / min, fill the fluidized bed with nitrogen, and fluidize it for 8 hours at an air velocity of 6 L / min.

[0062] 3) The temperature was raised to 800° C. at a heating rate of 10° C. / min, and nitrogen was filled into the fluidized bed at an air velocity of 6 L / min, and fluidized for 5 hours.

[0063] 4) Put the material obtained in step 3) into a graphitization furnace for graphitization, the graphitization temperature is 3100° C., and the time is 20 hours.

[0064] 5) Coating the obtained graphitized particles with carbon, then sieving to obtain a material with Dmax≤40 μm, and then dema...

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Abstract

The invention relates to the field of battery materials, in particular to a graphite negative electrode material, a preparation method thereof and a secondary battery. The preparation method of the graphite negative electrode material comprises the following steps of carrying out first-stage fluidization on aggregate particles and asphalt particles in an inert atmosphere at 150-350 DEG C, wherein the mass ratio of the aggregate particles to the asphalt particles is (80-98): (2-20), carrying out second-stage fluidization at the temperature of 400-800 DEG C in an inert atmosphere, and then graphitizing in an inert atmosphere, wherein the particle size of the asphalt particles is 2-20 mum. According to the isotropic graphite secondary particle negative electrode material prepared by the preparation method disclosed by the invention, the aggregation disordering degree of single-particle aggregate in particles can be effectively improved, and the OI value of a pole piece can be reduced, so that the rate capability of a battery is improved.

Description

technical field [0001] The present application relates to the field of battery materials, in particular, to a graphite negative electrode material, a preparation method thereof, and a secondary battery. Background technique [0002] Graphite, as the most widely used anode material in lithium-ion batteries, has a stable voltage platform and long-term cycle stability. As an important part of graphite materials, artificial graphite is widely recognized by the market because of its high capacity, long cycle life, and excellent rate performance. Among the negative electrode materials in existing lithium-ion batteries, the proportion of artificial graphite can reach 80%. about. Most single-particle graphite aggregate materials are anisotropic, so in the conventional solid-phase secondary granulation process, it is difficult to overcome the orientation characteristics of the material, and the OI value of the material is high. Contents of the invention [0003] The purpose of th...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525
CPCH01M4/362H01M4/583H01M4/62H01M10/0525Y02E60/10
Inventor 刘东海王志勇
Owner HUNAN SHINZOOM TECH
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