Negative electrode active material for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery

Abstract

A negative electrode active material for a non-aqueous electrolyte secondary battery according to one example of an embodiment comprises composite particles (30) that include a lithium aluminate phase (31) and a silicon phase (32) dispersed in the lithium aluminate phase (31). The lithium aluminate phase (31) contains boron, and the ratio (MAI/MB) of the aluminum percentage content (MAI) and the boron percentage content (NIB) with respect to the total amount of the elements other than oxygen constituting the lithium aluminate phase (31) and the silicon phase (32) is 1.0-30.0, inclusive.

Dependencies are inferred from the claim text.