Yolk-shell structured particles, method for producing same, and lithium secondary battery comprising same
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 cm 3 /g or less, and a method for preparing the same.
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.