Combining Experimental and Computational Techniques to Understand the Role of Native Oxide on the Solid Electrode Interphase Formation on Si Electrode in Li-Ion Batteries

ORAL

Abstract

With the current surge in energy demand for electrification of transportation, developing high energy storage devices is essential. Si anode based Li-ion batteries offer huge promise in this regard by providing high theoretical capacity of 3579 mAh/g, 10 times higher than graphite anode based Li-ion batteries (LIBs). One of the major contributor to capacity fade in Li-ion batteries is the uncontrolled growth of the solid-electrolyte interphase (SEI) layer. SEI is formed due to the decomposition of electrolytes and consumes Li ions. Despite a significant amount of work on SEI, our understanding of both its formation and growth is still limited. In this work, we studied the lithiation mechanism of the inevitable native oxide on the Si surface, identified the stable phases formed due to the lithiation and determined how these stable phases become part of the SEI by using Ab-initio molecular dynamics, X-Ray photoelectron spectroscopy (XPS) and X-Ray reflectivity (XRR). This fundamental understanding of SEI formation would enable to find better strategies for designing high-performance LIBs.

–

Presenters

  • Iwnetim Abate

    Stanford, Stanford Univ

Authors

  • Iwnetim Abate

    Stanford, Stanford Univ

  • Chuntian Cao

    Stanford Univ

  • Hans-Georg Steinrück

    SSRL, SLAC National Accelerator Laboratory

  • Chunjing Jia

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, SLAC National Accelerator Laboratory, SIMIS, Stanford University, SLAC - Natl Accelerator Lab, Stanford University, Stanford Univ

  • Brian Moritz

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, SLAC - Natl Accelerator Lab, SLAC and Stanford University, SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, SLAC National Laboratory, SIMIS, Stanford University, Physics, Stanford University, Stanford Univ, SIMES, SLAC and Stanford University

  • Thomas Devereaux

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Stanford Univ, SLAC and Stanford University, SLAC National Accelerator Laboratory, SLAC - Natl Accelerator Lab, Stanford Institute for Materials and Energy Sciences, SLAC National Laboratory, Stanford University, SIMIS, Stanford University, Physics, Stanford University, SLAC National Lab and Stanford University, SIMES, SLAC and Stanford University

  • Michael Toney

    SSRL, SLAC National Accelerator Lab, SLAC - Natl Accelerator Lab, Stanford Synchrotron Radiation Lightsource, SLAC National Laboratory, SLAC National Accelerator Laboratory, SSRL, SLAC National Accelerator Laboratory