Negative electrode for non-aqueous electrolyte secondary batteries

Abstract

This improves the energy density and charge rate characteristics of the negative electrode, while also reducing the expansion of the negative electrode. [Solution] The negative electrode for a non-aqueous electrolyte secondary battery includes a current collector, a first active material layer, and a second active material layer in that order. Each of the first and second active material layers contains negative electrode active material. The negative electrode active material includes natural graphite and Si-based active material. The mass fraction of Si-based active material in the second active material layer is higher than the mass fraction of Si-based active material in the first active material layer. The orientation angle of natural graphite in the second active material layer is larger than the orientation angle of natural graphite in the first active material layer. The orientation angle represents the acute angle between the major axis diameter of the natural graphite and the surface of the current collector.