Negative electrode for lithium ion secondary cell, lithium ion secondary cell, and method for producing lithium ion secondary cell

Abstract

A technique of preventing the formation of dendritic Li metal on a negative electrode active material surface and suppressing a reduction in cell capacity. In the negative electrode for a lithium ion secondary cell, a negative electrode mixture layer including a negative electrode active material is formed on a foil-shaped negative electrode current collector surface, ion exchange particles that adsorb transition metal ions and release prescribed cations are included in the negative electrode mixture layer, and gold and/or platinum is present in the ion exchange particles. As a result, a large number of metal nanoparticles derived from cations of Au (or Pt) released from the ion exchange particles attach to the negative electrode active material. Since layered Li metal can be easily formed using such metal nanoparticles as metal nuclei, formation of dendritic Li metal is prevented and a reduction in cell capacity can be suppressed.

Dependencies are inferred from the claim text.