NEGATIVE-ELECTRODE ACTIVE SUBSTANCE, NEGATIVE ELECTRODE ACTIVE SUBSTANCE MATERIAL, NEGATIVE ELECTRODE, LITHIUM ION SECONDARY BATTERY, NEGATIVE ELECTRODE ACTIVE SUBSTANCE MANUFACTURING METHOD, AND LITHIUM ION SECONDARY BATTERY MANUFACTURING METHOD

摘要

This negative electrode active substance containing negative electrode active substance particles is characterized in that: the negative electrode active substance particles contain a silicon-based material composed of SiOx (0.5≤x≤1.6); and a peak value intensity value (A) of an Si region at a chemical shift value of -50 to -95 ppm, and a peak value intensity value (B) of an SiO2 region at a chemical shift value of -96 to -150 ppm, said values being obtained from a 29Si-MAS-NMR spectrum of the silicon-based material, satisfy the relationship of A/B≥0.8. Consequently, the negative electrode active substance capable of increasing a battery capacity, and improving cycle characteristics and initial charge/discharge characteristics when used as a negative electrode active substance for a lithium ion secondary battery is provided.