Anode active material for all-solid-state battery

Patent metadata

Field	Value
Publication number	US-2024363836-A1
Application number	US-202318530061-A
Country	US
Kind code	A1
Filing date	Dec 5, 2023
Priority date	Apr 27, 2023
Publication date	Oct 31, 2024
Grant date	—

Abstract

Disclosed are an anode active material for an all-solid-state battery in which a lithophilic material is deposited in and on particles.

First claim

What is claimed is:

1 . An anode active material for an all-solid-state battery, comprising:
a particle comprising a plurality of flake carbon fragments overlapped in multiple layers; a first material loaded in a space between the plurality of the flake carbon fragments and having lithiophilic property; and a second material applied onto at least a portion of a surface of the particle and having lithiophilic property, wherein within a cross section of the anode active material, a ratio of the area of the particle to a sum of the areas of the first material and the second material is in a range of about 5:5 to 8:2.

2 . The anode active material of claim 1 , wherein the anode active material comprises a core portion provided in the center of the cross section of the anode active material and having a quarter of the total area of the cross section; and a periphery portion being a remaining area other than the core portion,
an area of the first material is about 30% to 60% of the total area of the core portion.

3 . The anode active material of claim 1 , wherein the anode active material comprises (i) a core portion provided in the center of the cross section of the anode active material and having a quarter of the total area of the cross section; and (ii) a periphery portion being a remaining area other than the core portion,
a sum of the areas of the first material and the second materials is about 20% to 40% of the total area of the periphery portion.

4 . The anode active material of claim 1 , wherein the active material has a moisture content in a range of about 1 ppm to 50 ppm.

5 . The anode active material of claim 1 , wherein the anode active material has an L value in a range of about 44 to 70, an a value in a range of about −0.5 to −0.1, and a b value in a range of v-6 to 0 in an L*a*b*-coordinate color system.

6 . The anode active material of claim 1 , wherein the anode active material has a specific surface area in a range of about 0.5 m 2 /g to 4 m 2 /g.

7 . The anode active material of claim 1 , wherein a shortest distance between one flake carbon fragment and another adjacent flake carbon fragment is about 10 nm to 100 nm.

8 . The anode active material of claim 1 , wherein the first material occupies about 80% or greater of the space between the flake carbon fragments.

9 . The anode active material of claim 1 ,
wherein the first material comprises one or more selected from the group consisting of silver (Ag), magnesium (Mg), aluminum (Al), gallium (Ga), zinc (Zn), bismuth (Bi), tin (Sn), indium (In), antimony (Sb), lead (Pb), silicon (Si), and germanium (Ge); or an alloy thereof with lithium.

10 . The anode active material of claim 1 , wherein the first material comprises silicon (Si), or an alloy of silicon (Si) and lithium, and the first material is amorphous.

11 . The anode active material of claim 1 , wherein the second material covers about 90% or greater of the surface of the particles.

12 . The anode active material of claim 1 , wherein the second material has a thickness in a range of about 10 nm to 1,000 nm.

13 . The anode active material of claim 1 , wherein the second material comprises one or more selected from the group consisting of silver (Ag), magnesium (Mg), aluminum (Al), gallium (Ga), zinc (Zn), bismuth (Bi), tin (Sn), indium (In), antimony (Sb), lead (Pb), silicon (Si), and germanium (Ge); or an alloy thereof with lithium.

14 . The anode active material of claim 1 , wherein the second material comprises silicon (Si), or an alloy of silicon (Si) and lithium, and the second material is amorphous.

15 . The anode active material of claim 1 , wherein the anode active material has an average particle diameter (D50) in a range of about 1 μm to 20 μm.

16 . The anode active material of claim 1 , wherein the anode active material comprises:
an amount of about 40 wt % to 90 wt % of the particle; and an amount of about 10 wt % to 60 wt % of a sum of the first material and the second materials, the wt % based on the total weight of the anode active material.

17 . An anode comprising an anode active material of claim 1 .

18 . An all-solid-state battery comprising an anode of claim 17 .

19 . A vehicle comprising an all-solid battery of claim 18 .

20 . A method of producing an anode active material of claim 1 , comprising:
forming the particle in a predetermined shape by stacking or overlapping the plurality of the flake carbon fragments in multiple layers; and depositing the second material on the surface of the particle and depositing the first second material.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Im Ga Hyeon
• Kim Yun Sung
• Lee Yoon Kwang
• Lee Kyu Joon
• Lee So Young
• Min Hong Seok

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/364

  as mixtures · CPC title

• H01M4/36

  Selection of substances as active materials, active masses, active liquids · CPC title