All-solid-state battery comprising a pre-lithiated silicon negative electrode

Patent metadata

Field	Value
Publication number	US-2025201914-A1
Application number	US-202519066597-A
Country	US
Kind code	A1
Filing date	Feb 28, 2025
Priority date	Aug 8, 2023
Publication date	Jun 19, 2025
Grant date	—

Abstract

Disclosed is a negative electrode for an all-solid-state battery and an all-solid-state battery including the negative electrode. More specifically, disclosed is a pre-lithiated silicon negative electrode, and an all-solid-state battery comprising the same.

First claim

1 . An all-solid-state battery, comprising:
a negative electrode comprising a negative electrode active material layer, said negative electrode active material layer comprising silicon; a positive electrode; a sulfide-containing solid electrolyte between the negative electrode and the positive electrode; and an interfacial layer between the sulfide-containing solid electrolyte and the negative electrode active material layer, wherein: the negative electrode is pre-lithiated, wherein the negative electrode active material layer contains 0.25 mol to 2 mol of lithium based on 1 mol of silicon, wherein the sulfide-containing solid electrolyte is an argyrodite-based sulfide-containing solid electrolyte Li 6 PS 5 X, wherein X represents Cl, Br or I, and wherein the interfacial layer comprises at least one selected from Li 2 S or Li 3 P.

2 . The all-solid-state battery according to claim 1 , wherein the negative electrode active material layer contains 0.25 mol to 1 mol of lithium based on 1 mol of silicon.

3 . The all-solid-state battery according to claim 1 , wherein the negative electrode active material layer contains 0.5 mol to 1.5 mol of lithium based on 1 mol of silicon.

4 . The all-solid-state battery according to claim 1 , wherein the negative electrode active material layer contains 0.75 mol to 1.25 mol of lithium based on 1 mol of silicon.

5 . The all-solid-state battery according to claim 1 , wherein the negative electrode active material layer contains 1 mol to 2 mol of lithium based on 1 mol of silicon.

6 . The all-solid-state battery according to claim 1 , wherein after charging the all-solid-state battery, a content of Li 2 S in the interfacial layer is 1 mol % to 50 mol % based on 100 mol % of a total content of the sulfide-containing solid electrolyte and the interfacial layer.

7 . The all-solid-state battery according to claim 1 , wherein after charging the all-solid-state battery, a content of Li 2 S in the interfacial layer is 5 mol % to 45 mol % based on 100 mol % of a total content of the sulfide-containing solid electrolyte and the interfacial layer.

8 . The all-solid-state battery according to claim 1 , wherein the silicon comprises a plurality of silicon particles, and the silicon particles have a particle size of 0.1 μm to 10 μm.

9 . The all-solid-state battery according to claim 1 , wherein a content of lithium remaining in the negative electrode active material layer is 0.1 mol or more based on 1 mol of silicon, in a state where the all-solid-state battery is discharged after a plurality of charging/discharging cycles.

10 . The all-solid-state battery according to claim 1 , wherein the negative electrode active material layer further comprises a conductive material.

11 . The all-solid-state battery according to claim 1 , wherein the positive electrode comprises lithium cobalt oxide (LCO).

12 . The all-solid-state battery according to claim 1 , wherein the positive electrode comprises Li 6 PS 5 Cl.

13 . An all-solid-state battery, comprising:
a negative electrode comprising a negative electrode active material layer, said negative electrode active material layer comprising silicon; a positive electrode; a sulfide-containing solid electrolyte between the negative electrode and the positive electrode; and an interfacial layer between the sulfide-containing solid electrolyte and the negative electrode active material layer, wherein: the negative electrode is pre-lithiated, wherein the sulfide-containing solid electrolyte is an argyrodite-based sulfide-containing solid electrolyte Li 6 PS 5 Cl, and wherein the interfacial layer comprises Li 2 S.

14 . The all-solid-state battery according to claim 13 , wherein the negative electrode active material layer contains 0.25 mol to 2 mol of lithium based on 1 mol of silicon.

15 . The all-solid-state battery according to claim 13 , wherein a content of lithium remaining in the negative electrode active material layer is 0.1 mol or more based on 1 mol of silicon, in a state where the all-solid-state battery is discharged after a plurality of charging/discharging cycles.

16 . The all-solid-state battery according to claim 13 , wherein the negative electrode active material layer further comprises a conductive material.

17 . A method for making an all-solid-state battery, comprising:
providing a negative electrode, wherein the negative electrode comprises a negative electrode active material layer comprising silicon; providing a positive electrode; providing a sulfide-containing solid electrolyte between the negative electrode and the positive electrode; and forming an interfacial layer between the sulfide-containing solid electrolyte and the negative electrode active material layer, wherein: the negative electrode is pre-lithiated, wherein the negative electrode active material layer contains 0.25 mol to 2 mol of lithium based on 1 mol of silicon, wherein the sulfide-containing solid electrolyte is an argyrodite-based sulfide-containing solid electrolyte Li 6 PS 5 X, wherein X represents Cl, Br or I, and wherein the interfacial layer comprises at least one selected from Li 2 S or Li 3 P.

18 . The all-solid-state battery according to claim 17 , wherein the negative electrode active material layer contains 0.25 mol to 1 mol of lithium based on 1 mol of silicon.

19 . The all-solid-state battery according to claim 17 , wherein a content of lithium remaining in the negative electrode active material layer is 0.1 mol or more based on 1 mol of silicon, in a state where the all-solid-state battery is discharged after a plurality of charging/discharging cycles.

20 . The all-solid-state battery according to claim 17 , wherein the negative electrode active material layer further comprises a conductive material.

Assignees

• Lg Energy Solution Ltd
• Univ California

Inventors

• Lee Jeongbeom
• Song Min Sang
• Meng Ying Shirley
• Ham So-Yeon

Classifications

• H01M4/622

  being polymers · CPC title

• H01M10/058

  Construction or manufacture · CPC title

• H01M4/134 Primary

  Electrodes based on metals, Si or alloys · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2300/0068

  inorganic · CPC title