Preparation method of lithium ion battery composite particle graphite negative electrode material

A technology of lithium-ion batteries and composite particles, which is applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of low primary charge capacity, poor cycle performance, and poor rate cycle performance of artificial graphite single particle materials. Achieve the effects of good discharge stability, high power performance and high compaction density

Inactive Publication Date: 2018-03-06
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing artificial graphite secondary particle materials have poor cycle performance, low primary charge capacity, and poor rate cycle performance of artificial graphite single particle materials.

Method used

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  • Preparation method of lithium ion battery composite particle graphite negative electrode material

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Comparison scheme
Effect test

Embodiment 1

[0020] (1) In a nitrogen atmosphere, put petroleum coke into a low-temperature surface modification reaction kettle, and stir while raising the temperature to obtain secondary coated particles; the heating rate is 1.5°C / min; the stirring speed is 30 rpm , the heating time is 210min;

[0021] (2) Perform graphitization treatment on the secondary coated particles at 2800°C; the time of the graphitization treatment is 70h;

[0022] (3) Carry out fusion and extrusion treatment on the graphitized secondary particle coating body to form a fusion body; the particle size D50 of the fusion body is controlled at 14-17 μm; the fusion time is 3 minutes, and the material filling volume of the fusion body 85%;

[0023] (4) Carry out homogeneous premix processing to fusion body, the time of premix processing is 45min;

[0024] (5) further sieve the mixed fusion body, the mesh number of the sieve is 100 mesh, and take the undersieve to obtain secondary particles;

[0025] (6) Separately ta...

Embodiment 2

[0029] (1) In an argon atmosphere, put petroleum coke into a low-temperature surface modification reaction kettle, and stir while raising the temperature to obtain secondary coated particles; the heating rate is 1.5°C / min; the stirring speed is 30 rpm / min, the heating time is 210min;

[0030] (2) Perform graphitization treatment on the secondary coated particles at 2800° C.; the time for the graphitization treatment is 52 to 70 hours;

[0031] (3) Carry out fusion and extrusion treatment on the graphitized secondary particle coating body to form a fusion body; the particle size D50 of the fusion body is controlled at 14-17 μm; the fusion time is 3 minutes, 85% of the fusion body;

[0032] (4) Carry out homogeneous premix processing to fusion body, the time of premix processing is 45min;

[0033] (5) further sieve the mixed fusion body, the mesh number of the sieve is 100 mesh, and take the undersieve to obtain secondary particles;

[0034] (6) Separately take petroleum coke...

Embodiment 3

[0038] (1) In a helium atmosphere, put petroleum coke into a low-temperature surface modification reaction kettle, and stir while raising the temperature to obtain secondary coated particles; the heating rate is 1.5°C / min; the stirring speed is 30 rpm / min, the heating time is 210min;

[0039] (2) Perform graphitization treatment on the secondary coated particles at 2800° C.; the time for the graphitization treatment is 52 to 70 hours;

[0040] (3) Carry out fusion and extrusion treatment on the graphitized secondary particle coating body to form a fusion body; the particle size D50 of the fusion body is controlled at 14-17 μm; the fusion time is 3 minutes, and the material filling volume of the fusion body 75-85%;

[0041] (4) Carry out homogeneous premix processing to fusion body, the time of premix processing is 45min;

[0042] (5) further sieve the mixed fusion body, the mesh number of the sieve is 100 mesh, and take the undersieve to obtain secondary particles;

[0043...

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Abstract

The invention relates to the technical field of lithium ion battery materials, in particular to a preparation method of a lithium ion battery composite particle graphite negative electrode material. The method is characterized by comprising the following steps that 1, secondary coated particles are prepared; 2, the second coated particles are subjected to graphitization; 3, fusion extrusion is conducted; 4, fusion body premix processing is conducted; 5, sieving is conducted to obtain secondary particles; 6, coke pellets are prepared; 7, the coke pellets are crushed and subjected to stage treatment to obtain single particles; 8, the secondary particles and single particles are blended, and then the composite particle graphite negative electrode material is obtained. Compared with the priorart, the preparation technology is simple, the prepared negative electrode material is high in discharge capacity, good in discharge stability, high in power performance, good in cycle performance andhigh in compaction density.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a method for preparing a lithium-ion battery composite particle graphite negative electrode material. Background technique [0002] With its advantages of high specific energy, high working voltage, fast charging and discharging, long cycle life, safety and no pollution, lithium-ion batteries have successfully replaced other secondary batteries and become the preferred choice for small electronic products such as mobile phones, notebook computers and remote-controlled aircraft. It is the main energy source, and has greatly promoted the industrialization process of electric vehicles. Many countries have also fully launched the development of lithium-ion batteries in the military and aerospace fields, which puts forward higher requirements for lithium-ion batteries. [0003] With the development of science and technology, electronic products and energy vehicle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205H01M4/36H01M4/587H01M10/0525
CPCH01M4/366H01M4/587H01M10/0525C01P2006/40C01P2006/10C01P2006/11C01P2006/12C01P2004/61Y02E60/10
Inventor 顾凯丁晓阳李虹李惊蛰王旭峰李季胡德明
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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