Negative active material for rechargeable lithium battery and rechargeable lithium battery including same

Patent metadata

Field	Value
Publication number	US-11670762-B2
Application number	US-202117176592-A
Country	US
Kind code	B2
Filing date	Feb 16, 2021
Priority date	Feb 24, 2020
Publication date	Jun 6, 2023
Grant date	Jun 6, 2023

Abstract

Disclosed are a negative active material for a rechargeable lithium battery and a rechargeable lithium battery including the same. The negative active material includes: a silicon particle core comprising a silicon particle having a particle size in a micrometer range; an oxide layer having a thickness in a range of about 65 nm to about 450 nm, on the silicon particle core; and a conductive layer on the oxide layer.

First claim

What is claimed is:

1. A negative active material for a rechargeable lithium battery, comprising:
a silicon particle core comprising a silicon particle having a particle size in a micrometer range;
an oxide layer having a thickness in a range of about 65 nm to about 450 nm, on the silicon particle core; and
a conductive layer on the oxide layer,
wherein the oxide layer comprises SiO x , 0<x≤2.

2. The negative active material for the rechargeable lithium battery of claim 1 , wherein the silicon particle core has a particle size in a range of about 1 μm to about 10 μm.

3. The negative active material for the rechargeable lithium battery of claim 1 , wherein the oxide layer has a thickness in a range of about 80 nm to about 450 nm.

4. The negative active material for the rechargeable lithium battery of claim 1 , wherein the oxide layer is continuously on a surface of the silicon particle core.

5. The negative active material for the rechargeable lithium battery of claim 1 , wherein the negative active material comprises oxygen at an amount in a range of about 5 wt % to about 20 wt % based on the total of 100 wt % of the negative active material in the negative active material.

6. The negative active material for the rechargeable lithium battery of claim 1 , wherein the conductive layer includes a carbon-based material.

7. The negative active material for the rechargeable lithium battery of claim 6 , wherein the carbon-based material comprises hard carbon, soft carbon, or a combination thereof.

8. A rechargeable lithium battery, comprising:
a negative electrode including the negative active material of claim 1 ;
a positive electrode; and
an electrolyte.

9. The rechargeable lithium battery of claim 8 , wherein the negative electrode further comprises a carbon-based negative active material.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Youm Chul

Classifications

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/48

  of inorganic oxides or hydroxides · CPC title

• H01M4/386 Primary

  Silicon or alloys based on silicon · CPC title

• H01M10/44

  Methods for charging or discharging (circuits for charging H02J7/00) · CPC title