Materials for Energy, Efficiency and Sustainability: TechConnect Briefs 2015Materials for Energy, Efficiency and Sustainability TechConnect Briefs 2015

Energy Storage Chapter 1

Inclusion of Electromagnetic Stress to explain Lithiated Silicon Nanowires

D. Boone
Nanoscience Research Institute, United States

pp. 1 - 4

Keywords: lithiated silicon nanowires

Abstract: This study considers the electromagnetic stresses and simulates the lithium insertion into a silicon nanowire. The resulting model uses a multi-physics approach to explain the two detrimental effects that could result during the lithiated silicon process: (1) The partial lithiation effects that are observed in some silicon nanowires under negligible volume expansion; (2) The excessive volume expansion that is observed after full lithium ion insertion with a resulting Cassini oval shaped silicon nanowire. Magnetic and electric fields are included in this simulation in order to introduce additional compressive stresses that slows down the lithiation process and results in a partially lithiated silicon nanowire under certain boundary conditions. Also, additional tensile stresses are introduced via magnetic dipole moments through classical mechanics or Landau energy levels through quantum mechanics into this simulation to explain the anisotropic volume expansion that can occur under certain situations.