Yolk-shell structured particles, method for producing same, and lithium secondary battery comprising same

Patent metadata

Field	Value
Publication number	US-11999624-B2
Application number	US-201816644021-A
Country	US
Kind code	B2
Filing date	Sep 21, 2018
Priority date	Sep 29, 2017
Publication date	Jun 4, 2024
Grant date	Jun 4, 2024

Abstract

A particle with a yolk-shell structure including a shell including carbon; and a care including silicon (Si) provided inside the shell, wherein at least a part of the shell is spaced apart from the core, and the particle with the yolk-shell structure has a micropore volume of 0.15 cm3/g or less, and a method for preparing the same.

First claim

The invention claimed is:

1. A particle with a yolk-shell structure comprising:
a shell comprising carbon; and
a core comprising a plurality of silicon nanoparticles provided inside the shell each having an average particle size of 20 nm to 31.4 nm,
wherein at least a part of the shell is spaced apart from the core, and
the shell of the particle with the yolk-shell structure has a micropore volume of 0.15 cm 3 /g or less,
wherein the shell has a mesopore size of 2 nm or less.

2. The particle with the yolk-shell structure of claim 1 , wherein the micropore volume is 0.05 cm 3 /g or less.

3. The particle with the yolk-shell structure of claim 1 , wherein the micropore volume is 0.001 cm 3 /g or less.

4. The particle with the yolk-shell structure of claim 1 , which has a specific surface area of 600 m 2 /g or less.

5. The particle with the yolk-shell structure of claim 1 , which has a specific surface area of 50 m 2 /g to 120 m 2 /g.

6. A negative electrode for a lithium secondary battery comprising the particle with a yolk-shell structure of claim 1 .

7. A lithium secondary battery comprising:
the negative electrode of claim 6 ;
a positive electrode; and
an electrolyte.

Assignees

• Lg Chemical Ltd
• Iucf Hyu Erica Campus
• Lg Energy Solution Ltd

Inventors

• Chae Jonghyun
• Yoo Won Cheol
• Kim Min Seo
• Kim Jangbae
• Kang Min Seok

Classifications

• C01B33/023 Primary

  by reduction of silica or {free} silica-containing material · CPC title

• C01B32/05

  Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30 · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/1393

  of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/1395

  of electrodes based on metals, Si or alloys · CPC title