| abstract |
A negative electrode active material capable of improving 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, the negative electrode active material particles including silicon compound particles including a silicon compound (SiOx: 0.5 ≦ x ≦ 1.6), and a negative electrode active material The particle contains lithium, and the negative electrode active material particle is a negative electrode active material having a peak in a range of 2θ = 31.8 ± 0.5 ° in an X-ray diffraction spectrum using Cu Kα ray. [Selection] Figure 1 |