NEGATIVE-ELECTRODE ACTIVE MATERIAL AND BATTERY

A negative electrode active material 10 of the present disclosure includes a composite particle 1 and a coating layer 4 coating at least a part of a surface of the composite particle 1, the composite particle 1 includes an alkali aluminate phase 2 including at least one alkali metal element and Al, and a silicon phase 3 dispersed in the alkali aluminate phase 2, and the coating layer 4 includes a lithium sulfonate compound and a hydrophobic polymer compound.