Anode active material, preparation method therefor, and lithium secondary battery comprising same

A technology of negative electrode active material and carbon material, applied in the direction of lithium battery, active material electrode, negative electrode, etc., can solve the problems of volume expansion and capacity reduction of lithium secondary battery, so as to enhance mechanical properties, compensate for irreversible capacity loss, suppress The effect of volume expansion

Pending Publication Date: 2021-07-23
トカイカーボンコリアカンパニーリミティド
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, these materials have the problem that when these materials are electrochemically alloyed with lithium, their volume expands due to changes in the crystal structure
At this time, during the charging and discharging process, the loss of physical contact between the powder-coated electrode active materials or between the active material and the current collector will occur, resulting in a significant decrease in the capacity of the lithium secondary battery as the charging and discharging cycle proceeds.

Method used

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  • Anode active material, preparation method therefor, and lithium secondary battery comprising same
  • Anode active material, preparation method therefor, and lithium secondary battery comprising same
  • Anode active material, preparation method therefor, and lithium secondary battery comprising same

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preparation example Construction

[0064] According to another aspect of the present invention, there is provided a method for preparing a negative electrode active material, comprising: preparing a mixed powder by mixing carbon materials and silicon particles; and mechanically over-mixing the mixed powder.

[0065] According to an embodiment of the present invention, the mixed powder preparation step may prepare a mixed powder by mixing carbon materials and silicon particles.

[0066] According to an embodiment of the present invention, the overmixing step may mechanically overmix the mixed powder.

[0067] According to an embodiment of the present invention, the overmixing may be performed by a milling process. The milling process may include milling from a bead mill, a high energy ball mill, a planetary mill, a stirred ball mill, a vibration mill, SPEX At least any one selected from the group consisting of SPEX mill, Planetary mill, Attrition mill, Magneto-ball mill and vibration mill kind. The bead and b...

Embodiment 1

[0111] Graphite (Tokai carbon, BTR, etc.) is mechanically ground and mixed with silicon nanoparticles at a ratio of 7:3. Use Hosokawa Mikron (NOB, Mechano Fusion) mixer to mix at a speed of 2000rpm to 6000rpm for 30 minutes to 480 minutes, thereby preparing a negative electrode active material of about 10 μm based on D50, and using soft carbon (Soft carbon) to form the outer coating.

Embodiment 2

[0113] In Example 1, a negative electrode active material was prepared in the same manner as in Example 1 except that the particle size was 20 μm.

[0114] Scanning Electron Microscopy (SEM) Analysis - Particle Shape of Electrode Active Material

[0115] A scanning electron microscope (SEM) analysis was performed on the negative electrode active materials according to Examples 1 and 2. For scanning electron microscope (SEM) analysis, JSM-7600F of JEOL was used. The particle shape of the negative electrode active material and its cross section were analyzed.

[0116] image 3 To show a scanning electron microscope (SEM) image of the particle shape of the negative electrode active material according to Example 1 of the present invention, Figure 4 It is an enlarged view showing a particle cross-section of the cathode active material according to Example 1 of the present invention. refer to image 3 and Figure 4 , it can be seen that graphite and silicon particles are unif...

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Abstract

The present invention relates to an anode active material, a preparation method therefor, and a lithium secondary battery comprising same. An anode active material according to one aspect of the present invention comprises a carbon material and silicon particles, wherein the carbon material encompasses, inside bulk particles, the silicon particles and a method for preparing the anode active material, according to another aspect, comprises the steps of: preparing a mixture powder by mixing a carbon material and silicon particles; and mechanically over-mixing the mixture powder.

Description

technical field [0001] The invention relates to a negative electrode active material, a preparation method thereof and a lithium secondary battery comprising the same. Background technique [0002] Nowadays, lithium secondary batteries are attracting attention as power sources of portable small electronic devices. Lithium secondary batteries use an organic electrolyte solution, and their discharge voltage is twice as high as that of existing batteries using an alkaline aqueous solution, thus having high Energy Density. [0003] As a positive electrode active material for a lithium secondary battery, oxides composed of lithium and transition metals are mainly used, wherein lithium has a structure capable of intercalating lithium ions, for example, lithium cobalt oxide (LiCoO 2 ), lithium nickel oxide (LiNiO 2 ) or lithium nickel cobalt manganese oxide (Li[NiCoMn]O 2 ,Li[Ni 1-x-y co x m y ]O 2 )Wait. [0004] As negative electrode active materials, various types of car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36C01B32/05H01M4/38H01M4/587H01M4/62H01M10/052C01B33/02C01B32/21
CPCC01B32/05C01B32/21C01B33/02Y02E60/10H01M4/625H01M4/366H01M4/1395H01M4/386H01M2004/027H01M4/364H01M4/587H01M10/052C01P2004/80C01P2004/61C01P2006/40H01M4/043H01M2004/021
Inventor 姜石民
Owner トカイカーボンコリアカンパニーリミティド
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