Negative electrode active material, mixed negative electrode active material, negative electrode for nonaqueous electrolyte secondary battery, lithium ion secondary battery, and, production method of negative electrode active material

A negative electrode active material comprising:

• particles of negative electrode active material,
• wherein the particles of negative electrode active material contain particles of silicon compound containing a silicon compound (SiOx:0.5≤x≤1.6),
• the particles of negative electrode active material contain crystalline Li2SiO3 in at least a part thereof, and
• the particles of negative electrode active material satisfy the following formula 1 and formula 2 between an intensity A of a peak derived from Li2SiO3, an intensity B of a peak derived from Si, an intensity C of a peak derived from Li2Si2O5, and an intensity D of a peak derived from SiO2, which are obtained from 29Si-MAS-NMR spectra.
• A>B>D (1)
• A>C>D (2)

A production method of a negative electrode active material containing particles of negative electrode active material containing particles of silicon compound comprising:

• preparing particles of negative electrode active material containing particles of silicon compound containing a silicon compound (SiOx:0.5≤x≤1.6);
• and
• selecting particles of negative electrode active material that contain crystalline Li2SiO3 in at least a part thereof and satisfy the following formula 1 and formula 2 between an intensity A of a peak derived from Li2SiO3, an intensity B of a peak derived from Si, an intensity C of a peak derived from Li2Si2O5, and an intensity D of a peak derived from SiO2, which are obtained from 29Si-MAS-NMR spectra, from the particles of negative electrode active material,
• wherein a negative electrode active material is produced with the selected particles of negative electrode active material.
• A>B>D (1)
• A>C>D (2)