Negative electrode for secondary battery and manufacturing method of secondary battery with negative electrode

Abstract

The negative electrode of the secondary battery of a present disclosure is a negative electrode for secondary battery that includes a negative electrode current collector, and a negative electrode active material layer supported by the negative electrode current collector. The negative electrode active material layer includes a lower layer positioned at the negative electrode current collector side and an upper layer positioned at a surface side. The upper layer includes a first graphite particle and a first Si-containing particle, as a negative electrode active material, and the lower layer includes a second graphite particle and a second Si-containing particle, as the negative electrode active material. An expansion rate P1 of the first Si-containing particle is smaller than an expansion rate P2 of the second Si-containing particle, and a mean particle diameter M1 of the first Si-containing particle is smaller than a mean particle diameter M2 of the second Si-containing particle.

Dependencies are inferred from the claim text.