| abstract |
The present invention relates to a negative electrode active material containing negative electrode active material particles, the negative electrode active material particles containing silicon compound particles containing a silicon compound (SiO x : 0.5 ≦ x ≦ 1.6), and a silicon compound The particles contain crystalline Li 2 SiO 3 and Li 2 Si 2 O 5 at least in part, and are derived from 29 Si-MAS-NMR spectrum, derived from Li 2 SiO 3 peak intensity A, derived from Si Of the peak intensity B, the peak intensity C derived from Li 2 Si 2 O 5 , and the peak intensity D derived from SiO 2 , the peak intensity A or the peak intensity C is the strongest, and the peak intensity A and the peak intensity C is a negative electrode active material satisfying the relationship of the following formula 1. As a result, the slurry produced at the time of producing the negative electrode of the secondary battery can be stabilized, and when used as the negative electrode active material of the secondary battery, the negative electrode active that can improve the initial charge / discharge characteristics and the cycle characteristics. Substance is provided. Formula 1 C / 3 ≦ A ≦ 3C |