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Mesocarbon microbeads, graphite anode material, preparation methods thereof, and lithium ion battery

A technology of mesophase carbon microspheres and graphite negative electrodes, applied in the directions of graphite, battery electrodes, secondary batteries, etc., can solve the problems of low discharge capacity, high discharge capacity, poor rate performance, etc., and achieve high discharge capacity and graphitization degree. The effect of high and high fast charging performance

Active Publication Date: 2020-12-08
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects of graphite negative electrode materials in the prior art that either have high discharge capacity but poor rate performance, and need to go through a complicated post-processing process; or have good rate performance but low discharge capacity, and provide a A kind of mesophase carbon microsphere, graphite negative electrode material and preparation method thereof, lithium ion battery

Method used

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  • Mesocarbon microbeads, graphite anode material, preparation methods thereof, and lithium ion battery
  • Mesocarbon microbeads, graphite anode material, preparation methods thereof, and lithium ion battery
  • Mesocarbon microbeads, graphite anode material, preparation methods thereof, and lithium ion battery

Examples

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Effect test

Embodiment 1

[0077] (1) SiC dry powder with a Dv50 particle size of 0.3 μm (SEM picture as shown in figure 1 Shown) is added in the washing oil solvent, and the mass fraction of silicon carbide in the solvent is 10%. Add hexamethyldisilamine (HMDS) according to 0.5% of the mass of silicon carbide dry powder, turn on high-speed stirring (line speed 15m / s) and heat up to 100°C for constant temperature treatment for 3 hours to obtain silicon carbide slurry.

[0078] (2) Add the silicon carbide and refined coal pitch in step (1) to the molten refined pitch at a mass ratio of 0.005:1, and start stirring. The temperature of the system was raised to 440°C and kept constant for 8 hours. Turn off the heating, and when the temperature drops to 300°C, add toluene five times the weight of refined coal pitch to the reaction, filter while it is hot, and rinse with toluene of the same quality, and vacuum dry at 110°C for 24 hours to obtain mesophase carbon containing silicon carbide particles inside Mi...

Embodiment 2

[0082] The dispersant hexamethyldisilazane in step (1) in Example 1 was changed to trimethylchlorosilane, and other conditions and proportioning parameters remained unchanged to obtain the sample of Example 2.

Embodiment 3

[0084] Change the median Dv50 of silicon carbide in step (1) in Example 1 to 0.1 μm, and keep other conditions and proportioning parameters unchanged to obtain the sample of Example 3.

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Abstract

The invention discloses a mesocarbon microbead, a graphite anode material, and a preparation method thereof and a lithium ion battery. The preparation method of the mesocarbon microbeads comprises thefollowing steps: in a solvent capable of dissolving asphalt, mixing silicon-containing slurry with asphalt, and carrying out polymerization reaction to obtain the mesocarbon microbeads, wherein the silicon-containing slurry comprises silicon-containing particles and an organosilane solvent, in the asphalt, quinoline insoluble substances are less than or equal to 0.5%, and the percentage refers tothe mass percentage of quinoline insoluble substances in the asphalt, and the mass ratio of the silicon-containing particles to the asphalt is (0.001-0.1):1. The mesocarbon microbeads are graphitizedto obtain the graphite anode material. The prepared mesocarbon microbeads are good in sphericity degree, and the graphite anode material prepared from the mesocarbon microbeads is high in discharge capacity and good in quick charge performance. Compared with a traditional mesocarbon microbead preparation process, the preparation process is simple, and the graphitization degree and the electrochemical quick charging performance of the anode material are further improved.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a mesophase carbon microsphere, a graphite negative electrode material and a preparation method thereof, and a lithium ion battery. Background technique [0002] The anode materials for commercialized lithium-ion batteries are mainly graphite, which are mainly classified into artificial graphite, natural graphite and mesophase graphite made from mesocarbon microbeads (MCMB). Compared with natural graphite, the three have the highest capacity, followed by artificial graphite, and mesophase graphite has the lowest capacity. With the explosive growth of the automotive battery market, there are higher requirements for the safety and fast charging performance of lithium batteries. Anode materials with high capacity, high safety, and fast charging have become the focus and hotspot of lithium-ion battery research. [0003] The pure products of artificial graphite and natur...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/38H01M10/0525C01B32/20
CPCH01M4/362H01M4/583H01M4/625H01M4/386H01M10/0525C01B32/20Y02E60/10
Inventor 刘梦阳苗荣荣李念民吴志红丁晓阳
Owner SHANGHAI SHANSHAN TECH CO LTD
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