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Artificial graphite, method for preparing artificial graphite, negative electrode comprising artificial graphite, and lithium secondary battery

A technology of artificial graphite and graphitization, applied in the direction of secondary batteries, graphite, negative electrodes, etc., can solve the problems of reduced productivity of secondary batteries, defects in electrical properties, etc., to improve safety, and solve the effects of fire and explosion.

Pending Publication Date: 2022-06-03
LG ENERGY SOLUTION LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, during the pulverization of carbonaceous materials, foreign matter (magnetic foreign matter) of the pulverization equipment is inevitably generated due to abrasion of the pulverization equipment, etc.
In addition, such impurities may cause a decrease in productivity in the secondary battery manufacturing process and a problem of defects in electrical properties
In particular, metal component impurities in Li-ion secondary batteries can cause safety issues such as fire and explosion through various mechanisms

Method used

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  • Artificial graphite, method for preparing artificial graphite, negative electrode comprising artificial graphite, and lithium secondary battery
  • Artificial graphite, method for preparing artificial graphite, negative electrode comprising artificial graphite, and lithium secondary battery
  • Artificial graphite, method for preparing artificial graphite, negative electrode comprising artificial graphite, and lithium secondary battery

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Embodiment 1

[0106] (1) Preparation of artificial graphite

[0107] First, coke as a raw material is pulverized to an average particle size (D 50 ) was 10 μm, and a first deironing treatment was performed using an electromagnetic deironing system under a magnetic force of 36,000 gauss to remove magnetic foreign matter contained in the pulverized coke raw material.

[0108] The de-ironized product was pelletized at 800°C for 24 hours using a horizontal pelletizing system.

[0109] The granulated product was heat-treated using an Atcheson graphitization furnace at 2,800° C. for 400 hours, including heating time and cooling time, for graphitization.

[0110] Then, 100 parts by weight of the graphitized product was mixed with 5 parts by weight of pitch (solid pitch) as a carbon coating material using a vertical / horizontal mixer, and carbonization was performed at a temperature of 1500° C. for 24 hours, Thereby carbon coating is performed.

[0111] After that, the second deironing was perfor...

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Abstract

Disclosed are a method for preparing artificial graphite, a negative electrode comprising artificial graphite, and a lithium secondary battery, wherein the method comprises the steps of: pulverizing a carbon-based raw material; performing a first deferrization step to remove magnetic foreign matter generated during the pulverizing step from the pulverized carbon-based raw material; a granulation step for granulating the product from the first deferrization step; graphitizing the granulation product; and performing a second deferrization process to further remove the magnetic foreign matter from the graphitized product.

Description

technical field [0001] The present disclosure relates to artificial graphite, a method for preparing artificial graphite, an anode including the artificial graphite, and a lithium secondary battery including the anode. In particular, the present disclosure relates to artificial graphite having increased capacity and efficiency by removing metal impurities therefrom, a method for producing artificial graphite, an anode including the artificial graphite, and a lithium secondary battery including the anode. [0002] This application claims priority to Korean Patent Application No. 10-2020-0003818 filed in Korea on Jan. 10, 2020, the disclosure of which is incorporated herein by reference. Background technique [0003] As technical development and demand for mobile devices increase, the demand for secondary batteries as an energy source for such mobile devices is increasing. Among such secondary batteries, lithium secondary batteries having high energy density and operating vol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205C01B32/215C01B32/21H01M4/587H01M4/133H01M10/0525
CPCC01B32/205C01B32/215C01B32/21H01M4/587H01M4/133H01M10/0525H01M2004/027Y02E60/10H01M4/1393H01M4/043H01M4/583C01P2006/80H01M2004/021
Inventor 卢锡仁禹相昱李龙珠
Owner LG ENERGY SOLUTION LTD
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