Negative electrode and secondary battery

Abstract

Negative electrode for a secondary battery, comprising: a current collector; a first active material layer of the negative electrode provided on the current collector; and a second active material layer of the negative electrode provided on the first active material layer of the negative electrode, wherein the first and second active material layers of the negative electrode comprise a silicon-based active material and natural graphite, and the natural graphite has an average particle diameter (D50) of 9 µm or less, wherein a difference in porosity between the first active material layer of the negative electrode and the second active material layer of the negative electrode may be 6% or less, and D50 is measured by a laser diffraction method.