Anode active material for a lithium secondary battery, method of preparing the same and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-12512466-B2
Application number	US-202318457952-A
Country	US
Kind code	B2
Filing date	Aug 29, 2023
Priority date	Sep 29, 2022
Publication date	Dec 30, 2025
Grant date	Dec 30, 2025

Abstract

An anode active material for a lithium secondary battery and a lithium secondary battery including the same are provided. The anode active material includes a plurality of composite particles, each composite particle including a silicon-based active material particle including silicon; and a carbon coating layer formed on at least a portion of a surface of the silicon-based active material particle, wherein a relative standard deviation of G/Si peak intensity ratios of a Raman spectrum as defined in Equation 1 measured for each of 50 different composite particles among the plurality of composite particles is 50% or less.

First claim

What is claimed is:

1 . An anode active material for a lithium secondary battery comprising:
a plurality of composite particles, each composite particle including:
a silicon-based active material particle including at least one of silicon (Si) or silicon oxide SiOx, wherein x is larger than 0 and smaller than 2; and
a carbon coating layer formed on at least a portion of a surface of the silicon-based active material particle, the carbon coating layer including conductive carbon,
wherein a relative standard deviation of G/Si peak intensity ratios of a Raman spectrum as defined in Equation 1 measured for each of 50 different composite particles among the plurality of composite particles is 50% or less, wherein the G/Si peak intensity ratios of the Raman spectrum are in a range from 5 to 9:
G/Si peak intensity ratio of Raman spectrum= I G /I Si ,  [Equation 1]

wherein, in Equation 1, I G is a maximum peak intensity of each composite particle in a wavenumber range from 1565 cm−1 to 1620 cm−1 of the Raman spectrum, and I Si is a maximum peak intensity of each composite particle in a wavenumber range from 450 cm−1 to 550 cm−1 of the Raman spectrum.

2 . The anode active material according to claim 1 , wherein a content of the carbon coating layer based on a total weight of the composite particles is in a range from 1 percent by weight (wt %) to 8 wt %.

3 . The anode active material according to claim 1 , wherein the silicon-based active material particle is doped with at least one of Li, Mg, Al, Ca, Fe, Ti, or V.

4 . A lithium secondary battery comprising:
an anode comprising the anode active material for a lithium secondary battery according to claim 1 ; and a cathode disposed to face the anode.

5 . A method of preparing an anode active material for a lithium secondary battery, comprising:
preparing a plurality of silicon-based active material particles including at least one of silicon (Si) or silicon oxide SiOx, wherein x is larger than 0 and smaller than 2, wherein the preparing the plurality of silicon-based active material particles comprises mixing and calcining a silicon source, wherein the silicon source includes at least one of silicon or silicon dioxide (SiO2); and forming a plurality of composite particles, each composite particle including a carbon coating layer including conductive carbon and formed on at least a portion of a surface of at least one of the plurality of silicon-based active material particles by mixing the plurality of silicon-based active material particles with a carbon source gas to generate a mixture and calcining the mixture at a temperature of 400° C. to 1200° C., wherein a relative standard deviation of G/Si peak intensity ratios of a Raman spectrum as defined in Equation 1 measured for each of 50 different composite particles among the plurality of composite particles is 50% or less, wherein the G/Si peak intensity ratios of the Raman spectrum are in a range from 5 to 9:
G/Si peak intensity ratio of Raman spectrum= I G /I Si ,  [Equation 1]

wherein, in Equation 1, I G is a maximum peak intensity of each composite particle in a wavenumber range from 1565 cm−1 to 1620 cm−1 of the Raman spectrum, and I Si is a maximum peak intensity of each composite particle of a wavenumber range from 450 cm−1 to 550 cm−1 of the Raman spectrum.

Assignees

• Sk On Co Ltd
• Sk Innovation Co Ltd

Inventors

• Moon Joon Hyung
• Park Eun Jun
• Yun Jung Hyun
• Chung Ju Ho

Classifications

• H01M10/0525

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

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/48

  of inorganic oxides or hydroxides · CPC title

• H01M4/366 Primary

  as layered products · CPC title