Artificial graphite negative-pole material, preparation method therefor and lithium-ion battery

An artificial graphite negative electrode and graphitization technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of high preparation cost, low energy density, poor coating uniformity, etc., and improve the degree of anisotropy. High performance, excellent electrochemical performance, and easy quality control

Active Publication Date: 2020-01-03
贵州凯金新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondary particle coating carbonization can obtain high-capacity and high-rate materials, but there are problems such as poor coating uniformity, significant re-bonding phenomenon, and low yield, which seriously affect the processing performance of the material
[0004] In order to solve the above problems, the patent 201710683450.9 discloses a fast-charging graphite anode material and its preparation method, through mixing the graphite precursor with the coating material, low-temperature treatment and high-temperature graphitization treatment, but lacks the secondary granulation process and surface modification The improvement effect of ion diffusion path and interface is limited, the energy density is not high, and the improvement of fast charging performance is not obvious.
Patent 201711333907.X discloses a method for preparing a high-capacity and high-rate composite graphite anode material. By mixing graphite precursors with mesocarbon microspheres and co-granulating and graphitizing, although the kinetic level of the material is improved, However, the energy density is low and the preparation cost is high
Patent 201810939161.5 discloses a method for making high-rate fast-charging graphite anode materials. First, the graphite precursor is crushed and graphitized, and then fused with a binder for carbonization. Although the process is relatively simple, the coating of graphite monomer particles is not uniform. , there are many active sites in the carbonized structure, and the high temperature stability is insufficient

Method used

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  • Artificial graphite negative-pole material, preparation method therefor and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The needle coke with a volatile content of 0.5% was pulverized and shaped by a roll mill-shaper integrated machine to obtain primary particles A, and the average particle diameter D50 of the primary particles A was controlled to be 8 μm. Take part of the primary particles A and the cracking oil coating agent and put them into the vacuum kneader according to the mass ratio of 100:8, first knead at 120°C for 2 hours at normal pressure, then switch to vacuum mode and knead at 250°C for 4 hours, and put the kneaded material into the vertical kneader In the reaction kettle, under the protection of nitrogen, the temperature was raised to 400°C at 5°C / min for 2 hours, and then the temperature was raised to 550°C at 3°C / min for 4 hours. After cooling, sieve to obtain particle B once; Particle A and petroleum asphalt with a softening point of 250°C and an average particle size of 7 μm were mixed evenly at a mass ratio of 100:10 and put into a drum furnace. Under nitrogen protecti...

Embodiment 2

[0031]The needle coke with a volatile content of 1% was pulverized and shaped by a roll mill-shaper integrated machine to obtain primary particles A, and the average particle diameter D50 of the primary particles A was controlled to be 8 μm. Take part of the primary granules A and the sucrose coating agent and put them into the vacuum kneader according to the mass ratio of 100:5, first knead at 120°C for 2 hours at normal pressure, then transfer to the vacuum mode and knead at 250°C for 4 hours, put the kneaded material into the vertical kneader In the reaction kettle, under the protection of nitrogen, heat at 5°C / min to 400°C for 2 hours, then heat at 3°C / min to 600°C for 2 hours, and sieve after cooling to obtain primary particles B; take part of the primary particles A and petroleum asphalt with a softening point of 150°C and an average particle size of 7 μm are mixed evenly at a mass ratio of 100:15 and put into a drum furnace. Under nitrogen protection, the temperature is ...

Embodiment 3

[0033] The needle coke with a volatile content of 5% is coarsely crushed to below 5 mesh, then modified at 900°C for 4 hours at high temperature, and then crushed and shaped by a roller mill-shaping machine to obtain primary granules A, and the primary granules A are controlled The average particle diameter D50 is 8 μm. Take part of the primary particles A and phenolic resin oil coating agent and put them into the vacuum kneader according to the mass ratio of 100:8, first knead at 120°C under normal pressure for 2 hours, then transfer to vacuum mode and knead at 250°C for 4 hours, put the kneaded material into In a vertical reactor, under the protection of nitrogen, heat at 5°C / min to 400°C for 2 hours, then heat at 3°C / min to 600°C for 2 hours, and sieve after cooling to obtain primary particle B; Primary particle A and petroleum resin with a softening point of 150°C and an average particle size of 9 μm are mixed evenly at a mass ratio of 100:12 and put into a roller furnace....

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Abstract

The invention discloses a preparation method for rate type artificial graphite negative-pole material with high energy density. The preparation method comprises the following steps: subjecting raw material cokes to coarse breaking and pulverizing directly or coarse breaking, high-temperature modifying and then pulverizing, and carrying out reshaping treatment, so as to obtain primary granules A; kneading the primary granules A and an organic carbon source, then, carrying out dynamic thermal coating, and carrying out screening, so as to obtain primary granules B; uniformly mixing the primary granules A with a binder, then, subjecting the mixture to granulating in a granulating reactor, and carrying out screening, so as to obtain secondary granules C; subjecting the primary granules B and the secondary granules C to graphitizing separately, and carrying out screening, so as to obtain graphitized primary granules B and graphitized secondary granules C; and uniformly mixing the graphitizedprimary granules B and the graphitized secondary granules C proportionally, and carrying out screening, thereby obtaining a finished product. The preparation method is simple in process and easy in quality control; and by applying the artificial graphite negative-pole material prepared by adopting the method to a lithium-ion battery, the lithium-ion battery is large in capacity, good in cycle andexcellent in quick charging performance.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to artificial graphite negative electrode materials, a preparation method thereof, and lithium ion batteries. Background technique [0002] As the most widely used driving force source for mobile digital terminals (mobile phones, tablets, notebooks) and new wearable devices, lithium-ion batteries have been maturely used for nearly 20 years. While people are pursuing ultra-long standby time of mobile devices, their charging time requirements are becoming more and more stringent. With the rapid development of electric vehicles, people are eager for electric vehicles to have fast charging performance while having long battery life. Therefore, the demand for high-capacity and high-rate lithium-ion batteries is increasing year by year. [0003] For a long time, increasing the capacity of artificial graphite, compacting, reducing expansion,...

Claims

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Application Information

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IPC IPC(8): C01B32/205H01M4/36H01M4/587H01M10/0525
CPCC01B32/205H01M4/366H01M4/587H01M10/0525Y02E60/10
Inventor 仰永军葛传长仰韻霖
Owner 贵州凯金新能源科技有限公司
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