Negative electrode active material, mixed negative electrode active material, negative electrode for non-aqueous electrolyte secondary battery, lithium ion secondary battery, method for producing negative electrode active material, and method for producing lithium ion secondary battery

Abstract

A negative electrode active material, wherein the negative electrode active material is a negative electrode active material including negative electrode active material particles; the negative electrode active material particles include silicon compound particles including a silicon compound (SiO: 0.5≤x≤1.6); the silicon compound particles include at least any one kind or more kinds of LiSiOand LiSiO; the negative electrode active material particles have a loose bulk density BD of 0.5 g/cmor more and 0.9 g/cmor less, a tapped bulk density TD of 0.7 g/cmor more and 1.2 g/cmor less, and a compression degree of 25% or less, the compression degree being defined by (TD−BD)/TD. Therefore, the negative electrode active material which is capable of improving the initial charge and discharge characteristics as well as the cycle characteristics upon using it as the negative electrode active material of a secondary battery is provided.