Anode including graphite and silicon-based material having different diameters and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-11929490-B2
Application number	US-201917048416-A
Country	US
Kind code	B2
Filing date	Jun 26, 2019
Priority date	Oct 24, 2018
Publication date	Mar 12, 2024
Grant date	Mar 12, 2024

Abstract

The present disclosure relates to an anode for a lithium secondary battery, wherein an anode material layer is formed on at least one surface of an anode current collector, and
the anode material layer includes large-particle graphite, a small-particle silicon-based material, and fine-particle graphite, and satisfies the following conditions 1 to 3: [Condition 1] Average diameter D50 of the large-particle graphite (D 1 ): 1 to 50 μm [Condition 2] Average diameter D50 of the small-particle silicon-based material (D 2 ): 0.155D 1 to 0.414D 1 [Condition 3] Average diameter D50 of the fine-particle graphite (D 3 ): 0.155D 1 to 0.414D 1 , or 0.155D 2 to 0.414D 2 .

First claim

The invention claimed is:

1. An anode for a lithium secondary battery, wherein an anode material layer is disposed on at least one surface of an anode current collector, and the anode material layer comprises large-particle graphite, a small-particle silicon-based material, and fine-particle graphite, and satisfies the following conditions 1 to 3:
condition 1: a diameter D50 of the large-particle graphite (D 1 ) is 1 to 50 μm;
condition 2: a diameter D50 of the small-particle silicon-based material (D2) is 0.155D 1 to 0.414D 1 ; and
condition 3: a diameter D50 of the fine-particle graphite (D 3 ) is 0.155D 1 to 0.414D 1 , or 0.155D 2 to 0.414D 2 .

2. The anode for a lithium secondary battery of claim 1 ,
wherein the diameter D50 of the large-particle graphite (D 1 ) is 5 to 30 μm.

3. The anode for a lithium secondary battery of claim 1 ,
wherein the diameter D50 of the small-particle silicon-based material (D 2 ) is 0.2D 1 to 0.4D 1 .

4. The anode for a lithium secondary battery of claim 1 ,
wherein the diameter D50 of the fine-particle graphite (D 3 ) is 0.2D 1 to 0.4D 1 , or 0.2D 2 to 0.4D 2 .

5. The anode for a lithium secondary battery of claim 1 ,
wherein the small-particle silicon-based material comprises at least one selected from the group consisting of a Si/C composite, SiO x (0<x<2), metal-doped SiO x (0<x<2), pure Si, and a Si-alloy.

6. The anode for a lithium secondary battery of claim 5 ,
wherein the metal-doped SiO x (0<x<2) is doped with at least one metal selected from the group consisting of Li, Mg, Al, Ca and Ti.

7. The anode for a lithium secondary battery of claim 1 ,
wherein the anode material layer comprises 30 to 99 wt % of the large-particle graphite, 0.5 to 40 wt % of the small-particle silicon-based material, and 0.5 to 30 wt % of the fine-particle graphite, based on a total weight of the large-particle graphite, the small-particle silicon-based material and the fine-particle graphite.

8. The anode for a lithium secondary battery of claim 1 ,
wherein the anode material layer further comprises a conductive material, a binder, or a mixture thereof.

9. The anode for a lithium secondary battery of claim 8 ,
wherein the conductive material and the binder are contained in an amount of 0.1 to 30 wt % based on a total weight of the anode material layer, respectively.

10. A lithium secondary battery comprising the anode for a lithium secondary battery of claim 1 .

Assignees

• Lg Energy Solution Ltd

Inventors

• Choi Junghyun
• Song Hyeon Min
• Sung Joo Hwan
• Park Han Sol
• Cho Minsu
• Park Sunghae
• Kwak Jingoo
• Park Younguk
• Kim Sue Jin
• Jang Jinsu

Classifications

• H01G11/38

  Carbon pastes or blends; Binders or additives therein · CPC title

• H01G11/50

  specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation · CPC title

• H01G11/32

  Carbon-based · CPC title

• H01G11/24

  characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor · CPC title

• H01M4/364 Primary

  as mixtures · CPC title