Negative electrode of secondary battery and secondary battery using the negative electrode

Abstract

Provided is a negative electrode that contains Si-containing particles and graphite particles, and causes less swelling when a secondary battery is repeatedly charged and discharged. The negative electrode of a secondary battery of the present disclosure 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 first layer located on a surface layer part side, and a second layer located on a negative electrode current collector side. The first layer contains first graphite particles and first Si-containing particles. The second layer contains second graphite particles and second Si-containing particles. An aspect ratio of the first Si-containing particles is larger than an aspect ratio of the second Si-containing particles. The aspect ratio of the first Si-containing particles is 4.0 to 10.0. The aspect ratio of the second Si-containing particles is 1.0 to 3.0.

Dependencies are inferred from the claim text.