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Production process of lithium battery negative electrode material

A negative electrode material and production process technology, which is applied in the production process field of lithium battery negative electrode materials, can solve the problems of poor uniformity of the coating layer, failure to meet energy saving and emission reduction, and low carbonization yield, so as to increase the carbonization yield and improve stability performance and other properties, and the effect of improving quality

Active Publication Date: 2017-12-29
SHANXI SANYUAN CARBON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this prior art has the following defects: 1. The carbonization process is easy to agglomerate, resulting in low carbonization yield and poor uniformity of the coating layer; 2. It needs to be broken after coating, which does not meet the requirements of energy saving and emission reduction

Method used

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  • Production process of lithium battery negative electrode material
  • Production process of lithium battery negative electrode material
  • Production process of lithium battery negative electrode material

Examples

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Effect test

Embodiment 1

[0031] A production process of a lithium battery negative electrode material, comprising the following production steps:

[0032] The first step is to prepare artificial graphite:

[0033] Remove impurities, purify the coal tar so that its quinoline insoluble content is less than 0.05%, and then use this as a raw material to prepare coal tar, which is catalytically modified to remove sulfur, nitrogen and quinoline in the coal tar. After insoluble matter, modified coal pitch is obtained, the softening point of modified coal pitch is 80°C, the coking value is 55%, and the content of quinoline insoluble matter is less than 0.01%;

[0034] Coking, coking the modified coal pitch at 510°C and calcining at 800°C to obtain homogenous coke;

[0035] Shaping, crushing and sieving the homogenous coke, then shaping, to obtain cobble-shaped coke powder with an aspect ratio of 1-1.5 (shape such as figure 1 As shown, the phase structure is as figure 2 shown);

[0036] Graphitization, th...

Embodiment 2

[0042] A production process of a lithium battery negative electrode material, comprising the following production steps:

[0043] The first step is to prepare artificial graphite:

[0044] Remove impurities, purify the coal tar so that its quinoline insoluble content is less than 0.05%, and then use this as a raw material to prepare coal tar, which is catalytically modified to remove sulfur, nitrogen and quinoline in the coal tar. After insoluble matter, modified coal pitch is obtained, the softening point of modified coal pitch is 100°C, the coking value is 45%, and the content of quinoline insoluble matter is less than 0.01%;

[0045] Coking, coking the modified coal pitch at 550°C and calcining at 700°C to obtain homogenous coke;

[0046] Shaping, crushing and sieving the homogenous coke and shaping to obtain cobble-shaped coke powder with an aspect ratio of 1-1.5;

[0047] Graphitization, the coke powder is graphitized to obtain artificial graphite, and the graphitizatio...

Embodiment 3

[0053] A production process of a lithium battery negative electrode material, comprising the following production steps:

[0054] The first step is to prepare artificial graphite:

[0055] Remove impurities, purify the coal tar so that its quinoline insoluble content is less than 0.05%, and then use this as a raw material to prepare coal tar, which is catalytically modified to remove sulfur, nitrogen and quinoline in the coal tar. After insoluble matter, modified coal pitch is obtained, the softening point of modified coal pitch is 90°C, the coking value is 50%, and the content of quinoline insoluble matter is less than 0.01%;

[0056] Coking, coking the modified coal pitch at 530°C and calcining at 750°C to obtain homogenous coke;

[0057] Shaping, crushing and sieving the homogenous coke and shaping to obtain cobble-shaped coke powder with an aspect ratio of 1-1.5;

[0058] Graphitization, the coke powder is graphitized to obtain artificial graphite, and the graphitization...

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Abstract

The invention provides a production process of a lithium battery negative electrode material. The production process comprises the following steps of 1, artificial graphite preparation: for impurity removal, preparing coal pitch, and performing catalytic modification on the coal pitch; for coke preparation, coking and calcining the modified coal pitch to obtain identical-nature coke; for shaping, performing shaping after the identical-nature coke is crushed and sieved, and obtaining pebble-shaped coke powder with the length-diameter ratio being 1 to 1.5; for graphitization, performing graphitization on the coke powder to prepare artificial graphite; 2, surface modification on the artificial graphite; 3, pre-oxidation: raising the temperature of the product obtained in the second step to be 300 to 330 DEG C, and then performing constant-temperature maintenance for 120 to 200min; 4, carbonization. The homemade low-impurity raw materials are used for preparing the negative electrode material; the peroxidation treatment is performed in a temperature programming mode before the carbonization; an amorphous carbon macromolecular chain of a coating layer is changed into a stable structure, so that the carbon macromolecular chain is in a thermodynamic stable state; the continuous carbonization yield is greatly improved; the performance of the negative electrode material is improved.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium batteries, in particular to a production process for negative electrode materials for lithium batteries. Background technique [0002] As one of the four major components of lithium batteries, the negative electrode material plays a very important role in improving the capacity and cycle performance of lithium batteries, and is the core link in the midstream of the lithium battery industry. There are many types of anode materials, among which graphite carbon materials have always been the mainstream of anode materials. Graphite is divided into natural graphite and artificial graphite. At present, artificial graphite is dominant in power batteries. Compared with natural graphite, artificial graphite has larger interlayer spacing, lower degree of graphitization (≤93%), lower crystallinity, and has a partial turbostratic structure. Moreover, artificial graphite has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M10/052
CPCH01M4/366H01M4/583H01M10/052Y02E60/10
Inventor 王永红李瑛李瑞芳任东霞祁占文陈茹
Owner SHANXI SANYUAN CARBON CO LTD
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