Abstract: The present application provides a negative electrode active material, a secondary battery comprising the same and an electrical device, wherein the negative electrode active material comprises a matrix material and a silicon-based material, the matrix material comprises a plurality of pore structures, at least a part of the silicon-based material is located in pore structures of the matrix material, the silicon-based material comprises a crystalline silicon-based material, a region formed by extending from outer surface of particle of the negative electrode active material to inside of the particle by a distance of 0.5 times a length between any point on the outer surface of the particle of the negative electrode active material and a core of the particle is recorded as an outer region, and a region inside the outer region is recorded as an inner region.

Abstract: A negative electrode active material includes a carbon-silicon composite, which includes a carbon-based particle and a silicon nanoparticle. The carbon-based particle has a carbon skeleton. The silicon nanoparticle is attach to the carbon skeleton of carbon-based particle. In a peripheral area of the carbon-silicon composite, a mass percentage content A1 of carbon element and a mass percentage content B1 of silicon element satisfy 0.8?B1/A1?2.5.