NEGATIVE ELECTRODE ACTIVE MATERIAL, NEGATIVE ELECTRODE MIXTURE USING SAME, NEGATIVE ELECTRODE AND LITHIUM ION SECONDARY BATTERY

摘要

Disclosed is a negative electrode active material for lithium ion secondary batteries, which contains a carbonaceous material having electrical conductivity and silicon nanoparticles having bonding surfaces that are chemically bonded to the surface of the carbonaceous material. Consequently, electrical isolation due to expansion and contraction of silicon nanoparticles accompanying intercalation and deintercalation of lithium ions is prevented, thereby enabling achievement of a lithium ion secondary battery that has excellent charge/discharge cycle characteristics.