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Anode active material, method for manufacturing same, and anode and secondary battery each comprising same

A negative active material and negative electrode technology, applied in the direction of secondary batteries, active material electrodes, negative electrodes, etc., can solve problems such as no alternatives proposed, achieve the effect of reducing specific surface area, preventing cyclic expansion, and preventing expansion problems

Pending Publication Date: 2021-12-03
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Although Japanese Patent Laid-Open Publication No. 4403327 discloses graphite powder for negative electrodes of lithium-ion secondary batteries, no alternative solution to the above-mentioned problems is proposed

Method used

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  • Anode active material, method for manufacturing same, and anode and secondary battery each comprising same

Examples

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preparation example Construction

[0064] The method for preparing the negative electrode active material of the present invention includes the step of pressing the natural graphite by a cold isostatic pressing method. Through the cold isostatic pressing method, the fine pores existing in the negative electrode active material containing natural graphite can be effectively removed or reduced, and the specific surface area of ​​natural graphite can be reduced to an appropriate level, so that the negative electrode activity thus prepared can be effectively prevented The problem of cyclic swelling of the material (this problem is caused by side reactions of the electrolyte).

[0065] The "cold isostatic pressing" method or CIP refers to a molding method in which powder is filled into a mold and compressed in infinite multiaxial directions by hydrostatic pressure. That is, according to the CIP process, the powder can be isostatically compressed, so that pores present in the molded negative electrode active material...

Embodiment 1

[0114] Embodiment 1: Preparation of negative electrode active material

[0115]

[0116] Natural graphite raw materials are collected from graphite ore by flotation, treated with acid or alkali to remove impurities, washed and dried to prepare flaky natural graphite. The flaky natural graphite obtained above was spheroidized using a vortex mill, treated with sulfuric acid to remove impurities therefrom, and then dried at 500° C. to prepare spherical natural graphite.

[0117] Spherical natural graphite was filled into a mold and pressurized by a cold isostatic pressing (CIP) method. During the pressurization, the pressurization pressure was 90 MPa, and the pressurization was performed for 100 seconds.

[0118] The pressed spherical natural graphite was mixed with pitch having a softening point of 130° C., and the mixture was heat-treated in a dry manner at 1250° C. for 24 hours in an inert atmosphere to form a carbon coating on the spherical natural graphite.

[0119] The ...

Embodiment 2

[0121] Embodiment 2: Preparation of negative electrode active material

[0122] Except D of the spherical natural graphite having the carbon coating formed thereon at the time of sieving after the carbon coating is formed in Example 1 10 、D 50 and D 90 Except adjusting to 7.3 μm, 9.0 μm, and 14.3 μm, respectively, the negative active material of Example 2 was prepared in the same manner as in Example 1.

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Abstract

The present invention relates to an anode active material comprising natural graphite, wherein the anode active material has a ratio of D90 to D10, that is D90 / D10 of 2.20 or less; a D50 of 6 [mu]m to 11 [mu]m; and a BET specific surface area of 2.2 m<2> / g or less.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2019-0038618 filed with the Korean Intellectual Property Office on April 2, 2019, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The invention relates to a negative electrode active material, a preparation method thereof, a negative electrode containing the same, and a lithium secondary battery. Background technique [0004] With rising energy prices due to the depletion of fossil fuels and rising concerns about environmental pollution, environmentally friendly alternative energy sources have become an essential factor for future life. [0005] In particular, the demand for secondary batteries as an environmentally friendly energy source has rapidly increased along with technological development and increased demand for mobile devices. [0006] Typically, secondary batteries...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/36H01M4/62H01M4/133H01M10/0525C01B32/21
CPCC01B32/21H01M4/587H01M10/0525Y02E60/10H01M4/366H01M4/625H01M4/133H01M4/043H01M4/1393C01P2004/32C01P2004/60C01P2004/84C01P2006/12C01P2004/61C01P2004/80C01P2006/40H01M2004/027
Inventor 朴丽霖金帝映禹相昱
Owner LG ENERGY SOLUTION LTD
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