| abstract |
A negative electrode active material comprising negative electrode active material particles, wherein the negative electrode active material is characterized in that the negative electrode active material particles contain silicon compound particles, and the silicon compound particles contain silicon compound SiO x , wherein 0.5≤x≤1.6 At least a part of the above-mentioned negative electrode active material particles contains crystalline Li 2 SiO 3 , and, the above-mentioned negative electrode active material particles, which are obtained by the 29 Si-MAS-NMR spectrum derived from Li 2 SiO 3 Peak intensity A, source The peak intensity B derived from Si, the peak intensity C derived from Li 2 Si 2 O 5 , and the peak intensity D derived from SiO 2 satisfy the following formula 1 or formula 2, A>B>D...(1) , A>C>D...(2). As a result, a negative electrode active material capable of increasing battery capacity and improving cycle characteristics and initial charge-discharge characteristics when used as a negative electrode active material of a lithium ion secondary battery is provided. |