High-compaction-density and high-rate-performance graphite negative electrode material and preparation method thereof

A graphite negative electrode and high-magnification technology, which is applied in chemical instruments and methods, battery electrodes, carbon compounds, etc., can solve the problems of long entry and exit paths of lithium ions, low material compaction density, and high manufacturing costs, and achieve rapid improvement. Charge and discharge performance, avoid collapse of graphite structure, and improve cycle stability

Pending Publication Date: 2022-08-09
乌海宝杰新能源材料有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the vigorous development of new energy electric vehicles, the requirements for lithium-ion battery anode materials are also continuously increasing. The preparation of anode materials for new energy electric vehicles has the requirements of high rate, long cycle, and high safety performance, and the graphite crystal structure is microscopic. It is anisotropic on the surface, so it is easy to form a directional arrangement parallel to the current collector, which will cause the entry and exit path of lithium ions from the graphite crystal to become longer, making the fast charging performance worse, and at the same time in the process of repeated entry and exit , will cause volume expansion and degrade cycle performance
Moreover, the processing performance of the powder is deteriorated, which is mainly manifested in the low compaction density of the material, and the large rebound after compaction, which reduces the specific capacity.
[0004] In order to solve the above problems, the current technical method is to use the granulation process to add small flake particles into the binder, bond the small particles into secondary particles, and obtain spherical graphite secondary particles through graphitization and carbonization. , but the manufacturing process of the above method is complicated and the manufacturing cost is high, and a new way to solve these existing problems is urgently needed

Method used

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  • High-compaction-density and high-rate-performance graphite negative electrode material and preparation method thereof
  • High-compaction-density and high-rate-performance graphite negative electrode material and preparation method thereof
  • High-compaction-density and high-rate-performance graphite negative electrode material and preparation method thereof

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preparation example Construction

[0028] like figure 2 As shown in the present invention, the method for preparing a graphite negative electrode material with high compaction density and high rate performance includes the following main steps: grinding coal-based needle coke powder to obtain small particles, and then mixing with medium-temperature petroleum-based asphalt micropowder through VC. Machine mixing and fusion machine treatment to obtain the fused material, and then subjected to isostatic pressing and graphitization treatment, and the graphitized block is crushed, pulverized, and shaped to obtain isotropic secondary graphite particles. Finally, the isotropic secondary graphite particles and the high softening point pitch are mixed and fused, and then carbonized to obtain the graphite negative electrode material. The specific preparation method is as follows:

[0029] Step 1: mixing the pulverized coal-based needle coke with medium-temperature petroleum pitch to obtain a mixed powder, wherein the me...

Embodiment

[0043] Step 1: Mix the milled needle coke with a particle size of 5 μm and a medium-temperature petroleum-based asphalt (softening point of 120° C.) with a particle size of 3 μm in a VC mixer for 40 minutes.

[0044] Step 2: The mixed powder is subjected to fusion treatment, and the fusion time is 20min.

[0045] Step 3: The fused material is subjected to liquid isostatic pressure treatment with a pressure of 150MPa; the treatment time is 30min.

[0046] Step 4: The block after isostatic pressing is subjected to graphitization treatment at a temperature of 2900° C. and a graphitization treatment time of 48 hours.

[0047] Step 5: The above graphitized block is then crushed, pulverized and shaped to obtain isotropic graphite secondary particles with an average particle size of 16 μm.

[0048] Step 6: Mixing, fusing and carbonizing the isotropic graphite secondary particles and high softening point pitch. The high softening point pitch is 200°C; the fusion time is preferably 2...

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Abstract

The invention discloses a high-compaction-density and high-rate-performance graphite negative electrode material and a preparation method thereof.The preparation method comprises the main steps that coal-based needle coke is ground into powder to obtain small particles, then the small particles and medium-temperature petroleum-based asphalt micro powder are mixed through a VC mixer and treated through a fusion machine to obtain a fused material, then isostatic pressing and graphitization treatment are conducted, and the graphite negative electrode material with the high-compaction-density and high-rate-performance is obtained. The graphitized block is subjected to crushing, grinding and shaping treatment to obtain isotropic secondary graphite particles, and finally, the isotropic secondary graphite particles and high-softening-point asphalt are subjected to mixing, fusion treatment and carbonization to obtain the graphite negative electrode material. The rate capability of the battery and the cycling stability of the negative electrode material are improved, and the rapid charging and discharging performance of the battery is optimized.

Description

technical field [0001] The invention relates to a graphite negative electrode material with high compaction density and high rate performance and a preparation method thereof, and belongs to the technical field of performance optimization of negative electrode materials for lithium batteries. Background technique [0002] At present, there are two main types of commercial lithium-ion battery anode carbon materials: natural graphite and artificial graphite. It is widely used because of its good charge and discharge capacity, good charge and discharge platform, and wide source of raw materials. [0003] With the vigorous development of new energy electric vehicles, the requirements for anode materials for lithium-ion batteries are constantly increasing. The preparation of anode materials for new energy electric vehicles has the requirements of high rate, long cycle and high safety performance, while the graphite crystal structure is in the microscopic It is anisotropic, so it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205H01M4/1393H01M10/0525
CPCC01B32/205H01M4/1393H01M10/0525Y02E60/10
Inventor 李波高明马欢郭嘉庆李娜
Owner 乌海宝杰新能源材料有限公司
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