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

Patent metadata

Field	Value
Publication number	US-2025055024-A1
Application number	US-202318470746-A
Country	US
Kind code	A1
Filing date	Sep 20, 2023
Priority date	Aug 8, 2023
Publication date	Feb 13, 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 comprising lithium cobalt oxide (LCO), Li 6 PS 5 Cl and vapor grown carbon fibers; 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 Cl, and wherein the interfacial layer comprises Li 2 S.

2 . (canceled)

3 . (canceled)

4 . 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.

5 . 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.

6 . 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.

7 . 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.

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

9 . (canceled)

10 . (canceled)

11 . The all-solid-state battery according to claim 5 , 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.

12 . The all-solid-state battery according to claim 5 , wherein after charging the all-solid-state battery, a content of Li 2 S in the interfacial layer is 10 mol % to 40 mol % based on 100 mol % of a total content of the sulfide-containing solid electrolyte and the interfacial layer.

13 . The all-solid-state battery according to claim 4 , wherein the negative electrode active material layer contains 0.5 mol to 1.5 mol of lithium based on 1 mol of silicon.

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

Assignees

• Lg Energy Solution Ltd
• Univ California

Inventors

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

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2300/0068

  inorganic · CPC title

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title