| abstract |
Provided is a negative electrode active material capable of improving battery capacity, cycle characteristics, and initial charge / discharge characteristics when used as a negative electrode active material of a lithium ion secondary battery. A negative electrode active material including negative electrode active material particles, wherein the negative electrode active material particles include silicon compound particles including a silicon compound (SiOx: 0.5 ≦ x ≦ 1.6), and the negative electrode The active material particles contain at least part of crystalline Li2SiO3, and the negative electrode active material particles have a peak intensity A derived from Li2SiO3 obtained from a 29Si-MAS-NMR spectrum, a peak intensity B derived from Si, A negative electrode active material, wherein the peak intensity C derived from Li2Si2O5 and the peak intensity D derived from SiO2 satisfy the following formula 1 or formula 2. A> B> D (1) A> C> D (2) [Selection] FIG. |