SILICON-BASED NEGATIVE ELECTRODE ACTIVE MATERIAL AND METHOD FOR MANUFACTURING SAME

摘要

A negative electrode active material of the present invention comprises a core containing: a silicon-based nanoparticle; and a polymer carbide distributed on the nanoparticle, wherein the core has a size of 30-300 nm. The negative electrode active material is prepared by a preparation method comprising: dispersing a suspension, which is obtained by adding silicon-based nanoparticles and a water-soluble polymer to a solvent, using ultrasonic waves; and carbonizing the water-soluble polymer to prepare a core, which comprises a silicon-based nanoparticle having a polymer carbide formed on a surface of the silicon-based nanoparticle. Therefore, a negative electrode active material can be provided that has a significantly low volume expansion rate and excellent electric conductivity compared with general non-carbon-based negative electrode active materials.