@article{31845,
  author = {Jagjit Nanda and Guang Yang and Tingzheng Hou and Dmitry N Voylov and Xin Li and Rose E Ruther and Michael Naguib and Kristin A Persson and Gabriel M Veith and Alexei P Sokolov},
  title = {Unraveling the Nanoscale Heterogeneity of Solid Electrolyte Interphase Using Tip-Enhanced Raman Spectroscopy},
  abstract = {<p><span>We employ tip-enhanced Raman spectroscopy (TERS) to study model amorphous silicon (a-Si) thin film anodes galvanostatically cycled for different numbers. For the 1× cycled a-Si, TERS shows good correlation between solid electrolyte interphase (SEI) topography and chemical mapping, corresponding to distribution of lithium ethylene dicarbonate (LEDC) and poly (ethylene oxide) (PEO)-like oligomer species. Subsequent electrochemical cycling makes the SEI relatively thick and rough with the chemical composition heavily dominated by LEDC monomer-dimer for 5× cycled a-Si. For 20× cycled a-Si, the TERS signal is dominated by carboxylate (RCO</span><span>2</span><span>Li) compounds of various conformations and fluorinated species (Li</span><span>x</span><span>PO</span><span>y</span><span>F</span><span>z</span><span>). A nanomosaic-multilayer hybrid SEI model on top of the a-Si anode is proposed. The significance of this work is applicable not only to silicon, where SEI plays a dominant role in determining the cycle life performance and reversibility, but also for a number of other relevant battery chemistries such as Na-ion and multivalent redox systems.</span></p>},
  year = {2019},
  journal = {Joule},
  month = {01/2019},
  issn = {25424351},
  doi = {10.1016/j.joule.2019.05.026},
  language = {eng},
}