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Preparation method of high-capacity quick-charging graphite negative electrode material

A graphite negative electrode and high-capacity technology, which is applied in the preparation/purification of carbon, graphite, battery electrodes, etc., can solve the problems of not being able to balance capacity and fast charging performance

Pending Publication Date: 2021-03-12
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The graphite negative electrode material prepared by the invention has high capacity and excellent fast charging performance, solves the problem that the existing technology cannot take into account the capacity and fast charging performance, and has high application value in the field of power batteries and high-end digital lithium-ion batteries

Method used

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  • Preparation method of high-capacity quick-charging graphite negative electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Raw material pulverization: pulverize the needle coke raw material, and shape it with a mechanical shaping machine until the D50 is 5-7 μm;

[0033] (2) Mixing: mix the pulverized raw material and petroleum pitch in a mixer in a mass ratio of 100:5;

[0034] (3) Granulation: Under the protection of an inert atmosphere, granulate in a reaction kettle at 550°C for 6 hours, and cool to room temperature to obtain a sample with a D50 of 10-15 μm;

[0035] (4) High-temperature graphitization: under the protection of an inert atmosphere, the granulated material is subjected to high-temperature graphitization at 2800 ° C for 72 hours, and cooled to room temperature;

[0036] (5) Classification: the material after graphitization is classified to obtain a sample particle size of 13-15 μm;

[0037] (6) Carbonization coating: Mix the graded samples and petroleum tar in a high-speed mixer at a mass ratio of 100:10, then carbonize at 1000°C for 12 hours under the protection of a...

Embodiment 2

[0040] (1) Raw material pulverization: pulverize the needle coke raw material, and shape it with a mechanical shaping machine until the D50 is 5-8 μm;

[0041] (2) Mixing: mix the pulverized raw material and coal tar pitch in a mixer in a mass ratio of 100:10;

[0042] (3) Granulation: Under the protection of an inert atmosphere, granulate in a reaction kettle at 600°C for 8 hours, and cool to room temperature to obtain a sample with a D50 of 12-16 μm;

[0043] (4) High-temperature graphitization: under the protection of an inert atmosphere, the granulated material was subjected to high-temperature graphitization at 2900°C for 48 hours, and cooled to room temperature;

[0044] (5) Classification: the material after graphitization is classified to obtain a sample particle size of 11-14 μm;

[0045] (6) Carbonization coating: Mix the classified samples and coal tar in a high-speed mixer at a mass ratio of 100:10, and then carbonize at 1100°C for 8 hours under the protection of ...

Embodiment 3

[0048] (1) Raw material pulverization: pulverize the needle coke raw material and shape it with a mechanical shaping machine until the D50 is 6-10 μm;

[0049] (2) Mixing: the pulverized raw material and the phenolic resin are mixed uniformly in a mixer at a mass ratio of 100:20;

[0050] (3) Granulation: Under the protection of an inert atmosphere, granulate in a reaction kettle at 650°C for 6 hours, and cool to room temperature to obtain a sample with a D50 of 13-16 μm;

[0051] (4) High-temperature graphitization: Under the protection of an inert atmosphere, the granulated material is subjected to high-temperature graphitization at 3000°C for 60 hours, and cooled to room temperature;

[0052] (5) Classification: the material after graphitization is classified to obtain a sample particle size of 13-16 μm;

[0053] (6) Carbonization coating: Mix the graded sample with the coating agent (the mass ratio of petroleum tar and graphene slurry is 3:1) in a high-speed mixer at a ma...

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Abstract

The invention relates to a preparation method of a high-capacity quick-charging graphite negative electrode material. The preparation method comprises the following steps: (1) crushing raw materials;(2) mixing; (3) granulating; (4) high-temperature graphitization; (5) grading; (6) carbonizing and coating; (7) treating a finished product. Compared with the prior art, the graphite negative electrode material prepared by the method has high capacity and excellent quick charging performance, solves the problem that the capacity and the quick charging performance cannot be considered in the priorart, and has very high application value in the fields of power batteries and high-end digital lithium ion batteries.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a preparation method of a high-capacity and fast-charging graphite negative electrode material. Background technique [0002] The main components of lithium-ion batteries include positive and negative electrode materials, electrolytes, and separators. Among them, positive and negative electrode materials not only play a key role in the performance of lithium-ion batteries, but also account for more than half of the production cost of the entire battery. Therefore, the development and preparation process of positive and negative electrode materials has become a key research content. [0003] Graphite is an earlier commercialized negative electrode material for lithium-ion batteries. Compared with other carbon materials, it has higher conductivity and crystallinity, and its good layered structure and charge-discharge voltage are also very suitable for the removal / in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/20C01B32/05C01B32/21H01M4/587H01M4/62H01M10/0525
CPCC01B32/20C01B32/21C01B32/05H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 杨正龙陈静
Owner TONGJI UNIV
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