Abstract: The present exemplary embodiments may provide a negative electrode material for a lithium secondary battery, the negative electrode material containing nano-silicon, crystalline carbon, amorphous carbon, and carbon nanotubes, wherein one end of the carbon nanotube is located inside the negative electrode material and the other end of the carbon nanotube protrudes out of the negative electrode material, and an average length of the carbon nanotubes protruding out of the negative electrode material is 0.1 ?m to 1 ?m.

Abstract: The present embodiments relate to a negative electrode active material for a lithium secondary battery, a method for preparing the same, and a lithium secondary battery comprising the same. The negative electrode active material for a lithium secondary battery, according to one embodiment, comprises a silicon-carbon composite comprising silicon nanoparticles and a carbon matrix, and can have a degree of oxidation that is less than or equal to 10.5%.

Abstract: The present disclosure includes a negative active material manufacturing method for lithium secondary battery, comprising: grinding the metal-based material into metal-based material nanoparticles through a grinding process; obtaining spherical particles by spheronizing the pulverized metal-based material nanoparticle, a conductive material, and a conductive additive together; obtaining a composite by complexing the spherical particles with an amorphous carbon-based precursor material; and carbonizing the composite; the conductive additive is a carbon nanotube; a content of the carbon nanotube is 0.2 to 2.3 wt % compared to the metal-based material nanoparticle in the composite, a negative active material according to the method, and a secondary battery including the same.

Abstract: An embodiment of the present invention provides an anode active material for a lithium secondary battery which is a porous silicon-carbon-based composite in which a plurality of nano-silicon particles are embedded in a carbon-based material, the composite having a plurality of pores, wherein the carbon-based material comprises graphite particles, soft carbon, hard carbon, or a combination thereof, and the soft carbon, in the carbon-based material, is in the form of a carbon layer.

Abstract: An embodiment of the present invention provides an anode active material for a lithium secondary battery, which is a porous silicon-carbon composite including a plurality of nano-silicon particles embedded in a carbon-based material and having a plurality of pores, wherein the carbon-based material includes graphite particles, soft carbon, hard carbon, or a combination thereof, and based on 100 wt % of the porous silicon-carbon composite, a weight ratio of the graphite particles to the soft carbon, the hard carbon, or a combination thereof is 1:5 to 5:1.