Anode and an all-solid-state battery including same

Patent metadata

Field	Value
Publication number	US-2025201805-A1
Application number	US-202418758407-A
Country	US
Kind code	A1
Filing date	Jun 28, 2024
Priority date	Dec 13, 2023
Publication date	Jun 19, 2025
Grant date	—

Abstract

Proposed is an anode containing an anode active material having a form in which at least a portion of the surface of a carbon material is coated with a lithiophilic material. The fastening pressure or N/P ratio in an all-solid-state battery, including the anode, is adjusted to suppress lithium dendrite growth and increase the energy density of the battery.

First claim

What is claimed is:

1 . An anode comprising:
an anode current collector; and an anode active material layer positioned on the anode current collector, the anode active material layer comprising an anode active material, wherein the anode active material layer comprises a plurality of pores, and the anode active material comprises a carbon material and a lithiophilic material, the lithiophilic material coating at least a portion of a surface of the carbon material.

2 . The anode of claim 1 , wherein the anode active material layer has a porosity in a range of 0.1% to 20%.

3 . The anode of claim 1 , wherein the lithiophilic material comprises at least one of silver (Ag), magnesium (Mg), aluminum (Al), gallium (Ga), zinc (Zn), bismuth (Bi), tin (S n ), indium (In), antimony (Sb), lead (Pb), silicon (Si), germanium (Ge), or any combination thereof.

4 . The anode of claim 1 , wherein the anode active material has a mean particle diameter (D 50 ) in a range of 0.5 μm to 30 μm.

5 . The anode of claim 1 , wherein the anode active material layer comprises an inorganic electrolyte, and
the anode active material layer comprises the anode active material and the inorganic electrolyte at a weight ratio in a range of 8:2 to 5:5.

6 . An all-solid-state battery comprising:
an anode; a solid electrolyte layer positioned on the anode, the solid electrolyte layer comprising a solid electrolyte; and a cathode positioned on the solid electrolyte layer, wherein the anode comprises:
an anode current collector; and
an anode active material layer positioned on the anode current collector, the anode active material layer comprising an anode active material,
wherein the anode active material layer comprises a plurality of pores, and the anode active material comprises a carbon material and a lithiophilic material, the lithiophilic material coating at least a portion of a surface of the carbon material.

7 . The all-solid-state battery of claim 6 , further comprising restraint units positioned outside a stack of the anode, the solid electrolyte layer, and the cathode to compress the stack inward in a direction in which the anode, the solid electrolyte layer, and the cathode are stacked,
wherein the restraint units apply a fastening pressure in a range of 1 MPa to 30 MPa to the stack of the anode, the solid electrolyte layer, and the cathode.

8 . The all-solid-state battery of claim 6 , wherein a ratio of an areal capacity of the anode to an areal capacity of the cathode (N/P ratio) is in a range of 0.5 to 1.2.

9 . The all-solid-state battery of claim 6 , wherein a ratio of an areal capacity of the anode to an areal capacity of the cathode (N/P ratio) is in a range of 0.5 to 1.0.

10 . The all-solid-state battery of claim 6 , wherein in a charged state of the all-solid-state battery, the anode comprises a lithium metal precipitated on at least one of a surface of the lithiophilic material or the plurality of pores of the anode active material layer.

11 . The all-solid-state battery of claim 6 , wherein in an overcharged state of the all-solid-state battery, lithium ions released from the cathode are precipitated in a lithium metal form on a surface of the lithiophilic material and the plurality of pores of the anode active material layer, thereby filling the plurality of pores.

12 . The all-solid-state battery of claim 6 , wherein the all-solid-state battery satisfies the following expression:
η fully charged state <η fully discharged state , where the η fully charged state is a porosity of the all-solid-state battery in a fully charged state, and the η fully discharged state is a porosity of the all-solid-state battery in a fully discharged state.

13 . The all-solid-state battery of claim 6 , wherein the all-solid-state battery satisfies the following expression:

V

fully
⁢

charged
⁢

state

/

V

fully
⁢

discharged
⁢

state

≤

1
.35

,

where the V fully charged state is a volume of the anode active material layer in a fully charged state, and the V fully discharged state is a volume of the anode active material layer in a fully discharged state.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

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

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2010/4292

  Aspects relating to capacity ratio of electrodes/electrolyte or anode/cathode · CPC title

• H01M2300/0068

  inorganic · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title