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Negative electrode active material, negative electrode and lithium secondary battery comprising same

A negative electrode active material, lithium secondary battery technology, applied in secondary batteries, active material electrodes, negative electrodes, etc., can solve the problems of battery rapid charging performance degradation, lithium ion inflow/outflow performance degradation and other problems, to achieve excellent fast charging performance effect

Active Publication Date: 2020-03-06
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Natural graphite, which is generally used as a negative electrode, has a large capacity per unit weight, but when the electrode is pressed, the degree of orientation increases, whereby the inflow / outflow performance of lithium ions deteriorates, so that there is a disadvantage that the rapid charging performance of the battery deteriorates

Method used

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  • Negative electrode active material, negative electrode and lithium secondary battery comprising same
  • Negative electrode active material, negative electrode and lithium secondary battery comprising same
  • Negative electrode active material, negative electrode and lithium secondary battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] (Step 1: Preparation of Negative Active Material)

[0106] The needle coke was pulverized using a jet mill, and then sieved to obtain an average particle size of 8 μm (D 50) powder. The obtained primary particle powder and a binder (petroleum-based pitch) were mixed in a weight ratio of 7:1 to prepare a granulated powder. The powder was heat-treated (graphitized) at 3,000°C for 24 hours under an inert (Ar) atmosphere to prepare 50 ) secondary particle artificial graphite negative electrode active material.

[0107] The artificial graphite secondary particles have a distance (d002) between (002) planes obtained by powder X-ray diffraction analysis of 0.3356 nm (DOG 97.15%), and a crystallite size of 269.5 nm in the c-axis direction. . The peak intensity ratio (I004 / I110) of the plane (004) and the plane (110) obtained by X-ray diffraction analysis of the electrode state was 12.6.

[0108] (Step 2: Manufacture of Negative Electrode)

[0109] The negative electrode ac...

Embodiment 2

[0113] Petroleum raw coke was pulverized using a jet mill, and then sieved to obtain an average particle size of 10 μm (D 50 ) powder. The primary particles of petroleum-based green coke and have an average particle size of 8 μm (D 50 ) of natural graphite powder in a weight ratio of 30:70, and then mixed with a binder (petroleum-based pitch) in a weight ratio of 6:1 and granulated to prepare an average particle size of 8 μm (D 50 ) powder.

[0114] Artificial graphite primary particles and natural graphite primary particles are granulated and agglomerated to prepare a material having an average particle diameter of 15.1 μm (D 50 ) negative electrode active material composed of secondary particles.

[0115] Using the prepared negative electrode active material, a negative electrode and a coin-type semi-secondary battery were fabricated in the same manner as in Example 1.

Embodiment 3

[0117] The needle coke was pulverized using a jet mill, and then sieved to obtain an average particle size of 8 μm (D 50 ) powder. The obtained primary particle powder and a binder (petroleum-based pitch) were mixed in a weight ratio of 5:1 to prepare a granulated powder. The powder was heat-treated (graphitized) at 3,000°C for 24 hours under an inert (Ar) atmosphere to prepare 50 ) secondary particle artificial graphite negative electrode active material.

[0118] Using the prepared negative electrode active material, a negative electrode and a coin-type semi-secondary battery were fabricated in the same manner as in Example 1.

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Abstract

The present invention relates to a negative electrode active material which comprises artificial graphite secondary particles formed by granulating artificial graphite primary particles having an average particle diameter (D50) of 10 nm to 9 um, wherein a value (V1) obtained by dividing a minimum particle diameter (Dmin) of the secondary particles by an average particle diameter (D50) of the primary particles is 0.50 to 0.8 and a value (V2) obtained by dividing a minimum particle diameter (Dmin) of the secondary particle by an average particle diameter (D50) of the secondary particles is 0.23to 0.4.

Description

technical field [0001] [Cross Reference to Related Application] [0002] This application claims the benefit of Korean Patent Application No. 10-2017-0160819 filed with the Korean Intellectual Property Office on November 28, 2017, 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 negative electrode containing the same, and a lithium secondary battery. Background technique [0004] With the technological development and increase in demand for mobile devices, the demand for secondary batteries as energy sources is rapidly increasing. Among such secondary batteries, lithium secondary batteries having high energy density and operating potential, long cycle life, and low self-discharge rate have been commercialized and widely used. [0005] Generally, lithium metal has been used as the negative electrode of secondary batteries. However, since the risk of ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M10/0525
CPCH01M4/587H01M10/0525H01M2004/021H01M2004/027H01M4/133Y02E60/10C01P2002/74
Inventor 朴丽霖金帝映郑周昊
Owner LG ENERGY SOLUTION LTD
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