| abstract |
In the present invention, as a negative electrode active material containing negative electrode active material particles, the negative electrode active material particles contain silicon compound particles containing a silicon compound (SiO x : 0.5≦x≦1.6), and the silicon compound particles are at least partially crystalline. with including Li 2 SiO 3, 29 Si- MAS-NMR is obtained from the spectrum, Li 2 SiO peak intensity derived from the 3 a, the peak intensity derived from the peak intensity of B, Li 2 Si 2 O 5 derived from Si Among the peak intensities D derived from C and SiO 2 , the peak intensity A takes the strongest intensity, and the peak intensity A and the peak intensity C satisfy the relationship of the following formula (1). Thereby, the slurry produced at the time of manufacturing the negative electrode of a secondary battery can be stabilized, and when used as a negative electrode active material of a secondary battery, a negative electrode active material capable of improving initial charge/discharge characteristics and cycle characteristics is provided. Equation 1 3C<A |