Nanoscale Three-Dimensional Imaging of Degradation in Composite Si-Containing Anodes

Zoey Huey, Caleb Stetson, Sang-Don Han, Donal Finegan, Yeyoung Ha, Patrick Walker, Chun-Sheng Jiang, Andrew Norman, Steven DeCaluwe, Mowafak Al-Jassim

Research output: NRELPoster


The use of silicon (Si) in next-generation lithium-ion battery (LIB) anodes has the potential to dramatically improve electrochemical performance over current LIB graphite (Gr) anodes, due to silicon's higher specific capacity. However, widespread implementation of Si-containing anodes is inhibited by issues such as significant Si volume expansion during lithiation and an unstable solid-electrolyte interphase (SEI), resulting in unreliable performance and poor cycle life. Currently, composite anodes with both Si and graphite active materials are used to increase capacity and mitigate some of the limitations associated with Si. In composite electrodes with a heterogeneous distribution of components with varying electrical properties (including Si, Gr, conductive carbon additive, and binder), it is important to understand the local distribution of each component to correlate with electrochemical processes, particularly localized degradation and heterogeneous aging, and to optimize performance. To investigate Si-containing composite anodes in the nanoscale, we use scanning spreading resistance microscopy (SSRM), a form of scanning probe microscopy (SPM) that probes local electronic resistivity. By examining the intrinsic electronic resistivity contrast between the anode components, separate phases can be distinguished and understood within the composite structure. This work studies the effect of electrochemical cycling in two different electrolytes on component distribution and aging by comparing the electrical and structural evolution of composite Si-graphite electrodes and SEI before and after charge-discharge cycling.
Original languageAmerican English
StatePublished - 2020

Publication series

NamePresented at the 2020 Materials Research Society (MRS) Fall Meeting, 27 November - 4 December 2020

NREL Publication Number

  • NREL/PO-5K00-78247


  • composite electrode
  • lithium-ion battery
  • scanning probe microscopy


Dive into the research topics of 'Nanoscale Three-Dimensional Imaging of Degradation in Composite Si-Containing Anodes'. Together they form a unique fingerprint.

Cite this