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Negative electrode active material for lithium secondary battery, manufacturing method therefor, lithium secondary battery negative electrode comprising same, and lithium secondary battery

A negative electrode active material, lithium secondary battery technology, applied in the direction of secondary batteries, active material electrodes, battery electrodes, etc., can solve the problems of unproposed alternatives, difficult rolling, difficult to obtain density, etc.

Active Publication Date: 2020-10-23
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, when the graphite-based active material is hard, rolling is difficult, and it may be difficult to obtain a desired density
On the other hand, when the graphite-based active material is soft, it is easy to obtain a high-density electrode due to easy rolling in the manufacture of the electrode, but it completely blocks the gaps existing between the particles and adversely affects the electrolyte. impregnation
[0009] Japanese Patent Publication No. 4403327 discloses a graphite powder for lithium-ion secondary battery negative electrode, but does not propose an alternative to the above-mentioned problems

Method used

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  • Negative electrode active material for lithium secondary battery, manufacturing method therefor, lithium secondary battery negative electrode comprising same, and lithium secondary battery
  • Negative electrode active material for lithium secondary battery, manufacturing method therefor, lithium secondary battery negative electrode comprising same, and lithium secondary battery
  • Negative electrode active material for lithium secondary battery, manufacturing method therefor, lithium secondary battery negative electrode comprising same, and lithium secondary battery

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preparation example Construction

[0065] The method for preparing the negative electrode active material for lithium secondary battery of the present invention comprises the following steps: preparing first negative electrode active material particles and second negative electrode active material particles; and mixing the first negative electrode active material particles and the second negative electrode active material particles.

[0066] The step of preparing the first negative electrode active material particle includes: step a), preparing the first artificial graphite particle; and step b), mixing the first artificial graphite particle with the material for forming the carbon coating, and subjecting the mixture to a second heat treatment , to form a carbon coating including hard carbon on the first artificial graphite particles, the carbon coating forming material includes a carbon-based material formed by the first heat treatment and a polymer for controlling crystallinity.

[0067] The average particle d...

Embodiment 1

[0113] Embodiment 1: Preparation of negative electrode active material for lithium secondary battery

[0114] Preparation of the first negative electrode active material particles

[0115] A coking process is performed in which petroleum pitch, which is a by-product generated after oil extraction, is calcined at 1500° C. to form needle coke-based artificial graphite, and the needle coke-based artificial graphite is heated at 3000° C. The heat treatment was carried out for more than 1 hour to prepare graphitized primary artificial graphite particles with an average particle diameter of 10 μm.

[0116] Subsequently, the primary artificial graphite particles were mixed with a mixture containing, as a material for carbon coating formation, petroleum pitch subjected to a primary heat treatment at 1150° C. Polyacrylic acid is a crystallinity controlled polymer. Polyvinylidene fluoride (PVDF) as a binder for carbon coating formation was added to the resulting mixture. The primary ...

Embodiment 2

[0123] Embodiment 2: Preparation of negative electrode active material for lithium secondary battery

[0124] In addition to using a mixture containing petroleum pitch subjected to the first heat treatment at 900° C. as a material for carbon coating formation and polyacrylic acid as a polymer for controlling crystallinity in a weight ratio of 50:50, in the same manner as in the implementation The same way in Example 1 prepares average particle diameter D 50 The first negative electrode active material particle is 20 μm.

[0125] Next, the first negative electrode active material particles and the second negative electrode active material particles prepared in Example 1 were mixed in a weight ratio of 70:30, and mixed using a TK mixer to prepare the negative active material particles of Example 2. Material.

[0126] In the thus prepared first anode active material particle in Example 2, the temperature at the exothermic peak in the differential thermogravimetric analysis of t...

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Abstract

The present invention provides a negative electrode active material for a lithium secondary battery, the negative electrode active material comprising: first negative electrode active material particles comprising first artificial graphite particles, and a carbon coating layer which is formed on the first artificial graphite particles and comprises hard carbon; and second negative electrode activematerial particles comprising second artificial graphite particles, wherein the difference in average particle diameter (D50) between the first negative electrode active material particles and the second negative electrode active material particles is at most 5 um, and the temperature at a heat radiation peak during a differential thermogravimetric analysis of the carbon coating layer is 580 DEGto 690 DEG.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2018-0039022 filed on April 4, 2018, the entire contents of which are incorporated herein by reference. technical field [0003] The invention relates to a negative electrode active material for a lithium secondary battery, a preparation method thereof, and a negative electrode for a lithium secondary battery and a lithium secondary battery containing the same. Background technique [0004] With rising energy prices due to the depletion of fossil fuels and increasing concerns over environmental pollution, environmentally friendly alternative energy sources have become an essential element of future life. [0005] In particular, the demand for secondary batteries as an environmentally friendly alternative energy source is rapidly increasing as the technology of mobile devices develops and demands increase. [0006] In ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/133C01B32/21C01B32/05H01M10/0525
CPCC01B32/05C01B32/21H01M4/133H01M4/587H01M10/0525Y02E60/10H01M4/366H01M4/364C01P2004/80C01P2004/61C01P2002/88C01P2004/84C01P2006/40H01M2004/021H01M2004/027
Inventor 崔希源李宰旭金银卿崔丞延金帝映
Owner LG ENERGY SOLUTION LTD
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