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Spheroidized carbonaceous negative electrode active material, method for producing same, and negative electrode and lithium secondary battery comprising same

A negative electrode active material and spheroidization technology, which is applied in secondary batteries, electrode manufacturing, active material electrodes, etc., can solve problems such as electrolyte damage, gas generation, and high-temperature storage characteristics reduction, and achieve reduced internal stress and high capacity retention. , The effect of improving the expansion characteristics

Pending Publication Date: 2022-05-17
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such voids reduce the density of negative active materials, thereby making it difficult to fabricate high-density negative plates
In addition, since the low-crystalline carbon coating film is broken during the process of densifying the anode active material on the current collector, the graphite end faces are exposed, causing problems of destruction and irreversible reactions caused by the electrolyte
[0010] In addition, compared with artificial graphite, natural graphite has the disadvantage of high degree of electrode expansion
In addition, the internal pores generated during spheroidization of natural graphite are larger than those of artificial graphite, and the resulting coating film causes problems of gas generation and reduction in high-temperature storage characteristics, which originate from generation at high temperature through such a large number of internal pores. side effects of

Method used

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  • Spheroidized carbonaceous negative electrode active material, method for producing same, and negative electrode and lithium secondary battery comprising same
  • Spheroidized carbonaceous negative electrode active material, method for producing same, and negative electrode and lithium secondary battery comprising same
  • Spheroidized carbonaceous negative electrode active material, method for producing same, and negative electrode and lithium secondary battery comprising same

Examples

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Embodiment 1

[0115] (Preparation of spheroidized carbonaceous negative electrode active material)

[0116] Flake graphite with an average particle diameter of 70 μm, solid pitch and liquid pitch with an average particle diameter of 5 μm were prepared in a weight ratio of 95:4:1, mixed by using a ball mill, and mixed by using a reverse jet mill (Hosokawa Micron, JP ) spheroidization to obtain spheroidized granulated particles. Then, 100 parts by weight of the obtained spheroidized granulated particles were mixed with 5 parts by weight of solid pitch as a carbon coating material, and the resulting mixture was carbonized at a temperature of 1,150° C. for 24 hours by using a ball mill to obtain a carbon-coated Spheroidized granulated particles of cloth.

[0117] Then, the carbon-coated spheroidized granulated particles were heat-treated at a temperature of 1,350° C. for 12 hours.

[0118] Then, the heat-treated product is disintegrated to obtain a spheroidized carbonaceous negative electrode...

Embodiment 2

[0124] The spheroidized carbonaceous negative electrode active material was obtained in the same manner as in Example 1, except that flake graphite, solid pitch and liquid pitch were prepared in a weight ratio of 96:3:1.

[0125] In addition, a secondary battery was obtained in the same manner as in Example 1 except that the negative electrode active material obtained as described above was used.

Embodiment 3

[0127] The spheroidized carbonaceous negative electrode active material was obtained in the same manner as in Example 1, except that flake graphite, solid pitch and liquid pitch were prepared in a weight ratio of 94:5:1.

[0128] In addition, a secondary battery was obtained in the same manner as in Example 1 except that the negative electrode active material obtained as described above was used.

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Abstract

The invention discloses a method for preparing a spheroidized carbonaceous negative electrode active material, which comprises the following steps: mixing flaky graphite, solid asphalt and liquid asphalt, and spheroidizing the obtained mixture to prepare spheroidized granulated particles; roasting the pelletized particles after the spheroidization; performing carbon coating on the granulated particles which are subjected to roasting and spheroidizing; heat treating the spheroidized granulated particles, which have been coated with carbon; and disintegrating the product after the heat treatment.

Description

technical field [0001] The invention relates to a spheroidized carbonaceous negative electrode active material, a preparation method thereof, a negative electrode containing the same, and a lithium secondary battery. More particularly, the present invention relates to a spheroidized carbonaceous negative electrode active material having reduced internal pores and improved sphericity, a preparation method thereof, and a negative electrode and lithium secondary battery comprising the same. [0002] This application claims priority from Korean Patent Application No. 10-2019-0123398 filed in Korea on October 4, 2019, the disclosure of which is incorporated herein by reference. Background technique [0003] As the technology of mobile devices develops and demands increase, there is an increasing demand for secondary batteries as energy sources for these mobile devices. Among these secondary batteries, lithium secondary batteries having high energy density and operating voltage, ...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M10/0525
CPCH01M4/587H01M10/0525C01B32/05C01B32/21Y02P20/133Y02E60/10H01M2004/027H01M4/362C01P2006/12C01P2006/14C01P2006/40C01P2004/84C01P2004/80H01M4/364H01M4/366H01M4/625H01M4/133C01P2004/32C01P2004/61H01M4/0471H01M4/1393H01M2004/021
Inventor 金贤撤禹相昱李昌周
Owner LG ENERGY SOLUTION LTD
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